Merge branch 'develop' into enhancement/1294-product-base-types-support-in-loading

.gitignore

@@ -82,6 +82,7 @@ poetry.lock
 .editorconfig
 .pre-commit-config.yaml
 mypy.ini
+poetry.lock
 
 .github_changelog_generator
 

client/ayon_core/addon/__init__.py

@@ -1,42 +1,38 @@
-# -*- coding: utf-8 -*-
+"""Addons for AYON."""
 from . import click_wrap
-from .interfaces import (
-    IPluginPaths,
-    ITrayAddon,
-    ITrayAction,
-    ITrayService,
-    IHostAddon,
-)
-
 from .base import (
-    ProcessPreparationError,
-    ProcessContext,
-    AYONAddon,
     AddonsManager,
+    AYONAddon,
+    ProcessContext,
+    ProcessPreparationError,
     load_addons,
 )
-
+from .interfaces import (
+    IHostAddon,
+    IPluginPaths,
+    ITraits,
+    ITrayAction,
+    ITrayAddon,
+    ITrayService,
+)
 from .utils import (
     ensure_addons_are_process_context_ready,
     ensure_addons_are_process_ready,
 )
 
-
 __all__ = (
-    "click_wrap",
-
-    "IPluginPaths",
-    "ITrayAddon",
-    "ITrayAction",
-    "ITrayService",
-    "IHostAddon",
-
-    "ProcessPreparationError",
-    "ProcessContext",
     "AYONAddon",
     "AddonsManager",
-    "load_addons",
-
+    "IHostAddon",
+    "IPluginPaths",
+    "ITraits",
+    "ITrayAction",
+    "ITrayAddon",
+    "ITrayService",
+    "ProcessContext",
+    "ProcessPreparationError",
+    "click_wrap",
     "ensure_addons_are_process_context_ready",
     "ensure_addons_are_process_ready",
+    "load_addons",
 )

client/ayon_core/addon/interfaces.py

@@ -1,16 +1,27 @@
+"""Addon interfaces for AYON."""
+from __future__ import annotations
+
 from abc import ABCMeta, abstractmethod
+from typing import TYPE_CHECKING, Callable, Optional, Type
 
 from ayon_core import resources
 
+if TYPE_CHECKING:
+    from qtpy import QtWidgets
+
+    from ayon_core.addon.base import AddonsManager
+    from ayon_core.pipeline.traits import TraitBase
+    from ayon_core.tools.tray.ui.tray import TrayManager
+
 
 class _AYONInterfaceMeta(ABCMeta):
-    """AYONInterface meta class to print proper string."""
+    """AYONInterface metaclass to print proper string."""
 
-    def __str__(self):
-        return "<'AYONInterface.{}'>".format(self.__name__)
+    def __str__(cls):
+        return f"<'AYONInterface.{cls.__name__}'>"
 
-    def __repr__(self):
-        return str(self)
+    def __repr__(cls):
+        return str(cls)
 
 
 class AYONInterface(metaclass=_AYONInterfaceMeta):
@@ -24,7 +35,7 @@ class AYONInterface(metaclass=_AYONInterfaceMeta):
     in the interface. By default, interface does not have any abstract parts.
     """
 
-    pass
+    log = None
 
 
 class IPluginPaths(AYONInterface):
@@ -38,10 +49,25 @@ class IPluginPaths(AYONInterface):
     """
 
     @abstractmethod
-    def get_plugin_paths(self):
-        pass
+    def get_plugin_paths(self) -> dict[str, list[str]]:
+        """Return plugin paths for addon.
 
-    def _get_plugin_paths_by_type(self, plugin_type):
+        Returns:
+            dict[str, list[str]]: Plugin paths for addon.
+
+        """
+
+    def _get_plugin_paths_by_type(
+            self, plugin_type: str) -> list[str]:
+        """Get plugin paths by type.
+
+        Args:
+            plugin_type (str): Type of plugin paths to get.
+
+        Returns:
+            list[str]: List of plugin paths.
+
+        """
         paths = self.get_plugin_paths()
         if not paths or plugin_type not in paths:
             return []
@@ -54,14 +80,18 @@ class IPluginPaths(AYONInterface):
             paths = [paths]
         return paths
 
-    def get_launcher_action_paths(self):
+    def get_launcher_action_paths(self) -> list[str]:
         """Receive launcher actions paths.
 
         Give addons ability to add launcher actions paths.
+
+        Returns:
+            list[str]: List of launcher action paths.
+
         """
         return self._get_plugin_paths_by_type("actions")
 
-    def get_create_plugin_paths(self, host_name):
+    def get_create_plugin_paths(self, host_name: str) -> list[str]:
         """Receive create plugin paths.
 
         Give addons ability to add create plugin paths based on host name.
@@ -72,11 +102,14 @@ class IPluginPaths(AYONInterface):
 
         Args:
             host_name (str): For which host are the plugins meant.
-        """
 
+        Returns:
+            list[str]: List of create plugin paths.
+
+        """
         return self._get_plugin_paths_by_type("create")
 
-    def get_load_plugin_paths(self, host_name):
+    def get_load_plugin_paths(self, host_name: str) -> list[str]:
         """Receive load plugin paths.
 
         Give addons ability to add load plugin paths based on host name.
@@ -87,11 +120,14 @@ class IPluginPaths(AYONInterface):
 
         Args:
             host_name (str): For which host are the plugins meant.
-        """
 
+        Returns:
+            list[str]: List of load plugin paths.
+
+        """
         return self._get_plugin_paths_by_type("load")
 
-    def get_publish_plugin_paths(self, host_name):
+    def get_publish_plugin_paths(self, host_name: str) -> list[str]:
         """Receive publish plugin paths.
 
         Give addons ability to add publish plugin paths based on host name.
@@ -102,11 +138,14 @@ class IPluginPaths(AYONInterface):
 
         Args:
            host_name (str): For which host are the plugins meant.
-        """
 
+        Returns:
+            list[str]: List of publish plugin paths.
+
+        """
         return self._get_plugin_paths_by_type("publish")
 
-    def get_inventory_action_paths(self, host_name):
+    def get_inventory_action_paths(self, host_name: str) -> list[str]:
         """Receive inventory action paths.
 
         Give addons ability to add inventory action plugin paths.
@@ -117,77 +156,84 @@ class IPluginPaths(AYONInterface):
 
         Args:
            host_name (str): For which host are the plugins meant.
-        """
 
+        Returns:
+            list[str]: List of inventory action plugin paths.
+
+        """
         return self._get_plugin_paths_by_type("inventory")
 
 
 class ITrayAddon(AYONInterface):
     """Addon has special procedures when used in Tray tool.
 
-    IMPORTANT:
-    The addon. still must be usable if is not used in tray even if
-    would do nothing.
-    """
+    Important:
+        The addon. still must be usable if is not used in tray even if it
+        would do nothing.
 
+    """
+    manager: AddonsManager
     tray_initialized = False
-    _tray_manager = None
+    _tray_manager: TrayManager = None
     _admin_submenu = None
 
     @abstractmethod
-    def tray_init(self):
+    def tray_init(self) -> None:
         """Initialization part of tray implementation.
 
         Triggered between `initialization` and `connect_with_addons`.
 
         This is where GUIs should be loaded or tray specific parts should be
-        prepared.
+        prepared
+
         """
 
-        pass
-
     @abstractmethod
-    def tray_menu(self, tray_menu):
+    def tray_menu(self, tray_menu: QtWidgets.QMenu) -> None:
         """Add addon's action to tray menu."""
 
-        pass
-
     @abstractmethod
-    def tray_start(self):
+    def tray_start(self) -> None:
         """Start procedure in tray tool."""
 
-        pass
-
     @abstractmethod
-    def tray_exit(self):
+    def tray_exit(self) -> None:
         """Cleanup method which is executed on tray shutdown.
 
         This is place where all threads should be shut.
+
         """
 
-        pass
+    def execute_in_main_thread(self, callback: Callable) -> None:
+        """Pushes callback to the queue or process 'callback' on a main thread.
 
-    def execute_in_main_thread(self, callback):
-        """ Pushes callback to the queue or process 'callback' on a main thread
+        Some callbacks need to be processed on main thread (menu actions
+        must be added on main thread else they won't get triggered etc.)
+
+        Args:
+            callback (Callable): Function to be executed on main thread
 
-            Some callbacks need to be processed on main thread (menu actions
-            must be added on main thread or they won't get triggered etc.)
         """
-
         if not self.tray_initialized:
-            # TODO Called without initialized tray, still main thread needed
+            # TODO (Illicit): Called without initialized tray, still
+            #   main thread needed.
             try:
                 callback()
 
-            except Exception:
+            except Exception:  # noqa: BLE001
                 self.log.warning(
-                    "Failed to execute {} in main thread".format(callback),
-                    exc_info=True)
+                    "Failed to execute %s callback in main thread",
+                    str(callback), exc_info=True)
 
             return
-        self.manager.tray_manager.execute_in_main_thread(callback)
+        self._tray_manager.tray_manager.execute_in_main_thread(callback)
 
-    def show_tray_message(self, title, message, icon=None, msecs=None):
+    def show_tray_message(
+            self,
+            title: str,
+            message: str,
+            icon: Optional[QtWidgets.QSystemTrayIcon] = None,
+            msecs: Optional[int] = None) -> None:
         """Show tray message.
 
         Args:
@@ -198,16 +244,22 @@ class ITrayAddon(AYONInterface):
             msecs (int): Duration of message visibility in milliseconds.
                 Default is 10000 msecs, may differ by Qt version.
         """
-
         if self._tray_manager:
             self._tray_manager.show_tray_message(title, message, icon, msecs)
 
-    def add_doubleclick_callback(self, callback):
+    def add_doubleclick_callback(self, callback: Callable) -> None:
+        """Add callback to be triggered on tray icon double click."""
         if hasattr(self.manager, "add_doubleclick_callback"):
             self.manager.add_doubleclick_callback(self, callback)
 
     @staticmethod
-    def admin_submenu(tray_menu):
+    def admin_submenu(tray_menu: QtWidgets.QMenu) -> QtWidgets.QMenu:
+        """Get or create admin submenu.
+
+        Returns:
+            QtWidgets.QMenu: Admin submenu.
+
+        """
         if ITrayAddon._admin_submenu is None:
             from qtpy import QtWidgets
 
@@ -217,7 +269,18 @@ class ITrayAddon(AYONInterface):
         return ITrayAddon._admin_submenu
 
     @staticmethod
-    def add_action_to_admin_submenu(label, tray_menu):
+    def add_action_to_admin_submenu(
+            label: str, tray_menu: QtWidgets.QMenu) -> QtWidgets.QAction:
+        """Add action to admin submenu.
+
+        Args:
+            label (str): Label of action.
+            tray_menu (QtWidgets.QMenu): Tray menu to add action to.
+
+        Returns:
+            QtWidgets.QAction: Action added to admin submenu
+
+        """
         from qtpy import QtWidgets
 
         menu = ITrayAddon.admin_submenu(tray_menu)
@@ -244,16 +307,15 @@ class ITrayAction(ITrayAddon):
 
     @property
     @abstractmethod
-    def label(self):
+    def label(self) -> str:
         """Service label showed in menu."""
-        pass
 
     @abstractmethod
-    def on_action_trigger(self):
+    def on_action_trigger(self) -> None:
         """What happens on actions click."""
-        pass
 
-    def tray_menu(self, tray_menu):
+    def tray_menu(self, tray_menu: QtWidgets.QMenu) -> None:
+        """Add action to tray menu."""
         from qtpy import QtWidgets
 
         if self.admin_action:
@@ -265,36 +327,44 @@ class ITrayAction(ITrayAddon):
         action.triggered.connect(self.on_action_trigger)
         self._action_item = action
 
-    def tray_start(self):
+    def tray_start(self) -> None:  # noqa: PLR6301
+        """Start procedure in tray tool."""
         return
 
-    def tray_exit(self):
+    def tray_exit(self) -> None:  # noqa: PLR6301
+        """Cleanup method which is executed on tray shutdown."""
         return
 
 
 class ITrayService(ITrayAddon):
+    """Tray service Interface."""
     # Module's property
-    menu_action = None
+    menu_action: QtWidgets.QAction = None
 
     # Class properties
-    _services_submenu = None
-    _icon_failed = None
-    _icon_running = None
-    _icon_idle = None
+    _services_submenu: QtWidgets.QMenu = None
+    _icon_failed: QtWidgets.QIcon = None
+    _icon_running: QtWidgets.QIcon = None
+    _icon_idle: QtWidgets.QIcon = None
 
     @property
     @abstractmethod
-    def label(self):
+    def label(self) -> str:
         """Service label showed in menu."""
-        pass
 
-    # TODO be able to get any sort of information to show/print
+    # TODO (Illicit): be able to get any sort of information to show/print
     # @abstractmethod
     # def get_service_info(self):
     #     pass
 
     @staticmethod
-    def services_submenu(tray_menu):
+    def services_submenu(tray_menu: QtWidgets.QMenu) -> QtWidgets.QMenu:
+        """Get or create services submenu.
+
+        Returns:
+            QtWidgets.QMenu: Services submenu.
+
+        """
         if ITrayService._services_submenu is None:
             from qtpy import QtWidgets
 
@@ -304,13 +374,15 @@ class ITrayService(ITrayAddon):
         return ITrayService._services_submenu
 
     @staticmethod
-    def add_service_action(action):
+    def add_service_action(action: QtWidgets.QAction) -> None:
+        """Add service action to services submenu."""
         ITrayService._services_submenu.addAction(action)
         if not ITrayService._services_submenu.menuAction().isVisible():
             ITrayService._services_submenu.menuAction().setVisible(True)
 
     @staticmethod
-    def _load_service_icons():
+    def _load_service_icons() -> None:
+        """Load service icons."""
         from qtpy import QtGui
 
         ITrayService._failed_icon = QtGui.QIcon(
@@ -324,24 +396,43 @@ class ITrayService(ITrayAddon):
         )
 
     @staticmethod
-    def get_icon_running():
+    def get_icon_running() -> QtWidgets.QIcon:
+        """Get running icon.
+
+        Returns:
+            QtWidgets.QIcon: Returns "running" icon.
+
+        """
         if ITrayService._icon_running is None:
             ITrayService._load_service_icons()
         return ITrayService._icon_running
 
     @staticmethod
-    def get_icon_idle():
+    def get_icon_idle() -> QtWidgets.QIcon:
+        """Get idle icon.
+
+        Returns:
+            QtWidgets.QIcon: Returns "idle" icon.
+
+        """
         if ITrayService._icon_idle is None:
             ITrayService._load_service_icons()
         return ITrayService._icon_idle
 
     @staticmethod
-    def get_icon_failed():
-        if ITrayService._failed_icon is None:
-            ITrayService._load_service_icons()
-        return ITrayService._failed_icon
+    def get_icon_failed() -> QtWidgets.QIcon:
+        """Get failed icon.
 
-    def tray_menu(self, tray_menu):
+        Returns:
+            QtWidgets.QIcon: Returns "failed" icon.
+
+        """
+        if ITrayService._icon_failed is None:
+            ITrayService._load_service_icons()
+        return ITrayService._icon_failed
+
+    def tray_menu(self, tray_menu: QtWidgets.QMenu) -> None:
+        """Add service to tray menu."""
         from qtpy import QtWidgets
 
         action = QtWidgets.QAction(
@@ -354,21 +445,18 @@ class ITrayService(ITrayAddon):
 
         self.set_service_running_icon()
 
-    def set_service_running_icon(self):
+    def set_service_running_icon(self) -> None:
         """Change icon of an QAction to green circle."""
-
         if self.menu_action:
             self.menu_action.setIcon(self.get_icon_running())
 
-    def set_service_failed_icon(self):
+    def set_service_failed_icon(self) -> None:
         """Change icon of an QAction to red circle."""
-
         if self.menu_action:
             self.menu_action.setIcon(self.get_icon_failed())
 
-    def set_service_idle_icon(self):
+    def set_service_idle_icon(self) -> None:
         """Change icon of an QAction to orange circle."""
-
         if self.menu_action:
             self.menu_action.setIcon(self.get_icon_idle())
 
@@ -378,18 +466,29 @@ class IHostAddon(AYONInterface):
 
     @property
     @abstractmethod
-    def host_name(self):
+    def host_name(self) -> str:
         """Name of host which addon represents."""
 
-        pass
-
-    def get_workfile_extensions(self):
+    def get_workfile_extensions(self) -> list[str]:  # noqa: PLR6301
         """Define workfile extensions for host.
 
         Not all hosts support workfiles thus this is optional implementation.
 
         Returns:
             List[str]: Extensions used for workfiles with dot.
-        """
 
+        """
         return []
+
+
+class ITraits(AYONInterface):
+    """Interface for traits."""
+
+    @abstractmethod
+    def get_addon_traits(self) -> list[Type[TraitBase]]:
+        """Get trait classes for the addon.
+
+        Returns:
+            list[Type[TraitBase]]: Traits for the addon.
+
+        """

client/ayon_core/pipeline/publish/__init__.py

@@ -46,6 +46,11 @@ from .lib import (
     get_publish_instance_families,
 
     main_cli_publish,
+
+    add_trait_representations,
+    get_trait_representations,
+    has_trait_representations,
+    set_trait_representations,
 )
 
 from .abstract_expected_files import ExpectedFiles
@@ -104,4 +109,9 @@ __all__ = (
 
     "RenderInstance",
     "AbstractCollectRender",
+
+    "add_trait_representations",
+    "get_trait_representations",
+    "has_trait_representations",
+    "set_trait_representations",
 )

client/ayon_core/pipeline/publish/lib.py

@@ -6,7 +6,7 @@ import inspect
 import copy
 import warnings
 import xml.etree.ElementTree
-from typing import Optional, Union, List
+from typing import TYPE_CHECKING, Optional, Union, List
 
 import ayon_api
 import pyblish.util
@@ -27,6 +27,12 @@ from .constants import (
     DEFAULT_HERO_PUBLISH_TEMPLATE,
 )
 
+if TYPE_CHECKING:
+    from ayon_core.pipeline.traits import Representation
+
+
+TRAIT_INSTANCE_KEY: str = "representations_with_traits"
+
 
 def get_template_name_profiles(
     project_name, project_settings=None, logger=None
@@ -1062,3 +1068,66 @@ def main_cli_publish(
             sys.exit(1)
 
     log.info("Publish finished.")
+
+
+def has_trait_representations(
+        instance: pyblish.api.Instance) -> bool:
+    """Check if instance has trait representation.
+
+    Args:
+        instance (pyblish.api.Instance): Instance to check.
+
+    Returns:
+        True: Instance has trait representation.
+        False: Instance does not have trait representation.
+
+    """
+    return TRAIT_INSTANCE_KEY in instance.data
+
+
+def add_trait_representations(
+        instance: pyblish.api.Instance,
+        representations: list[Representation]
+) -> None:
+    """Add trait representations to instance.
+
+    Args:
+        instance (pyblish.api.Instance): Instance to add trait
+            representations to.
+        representations (list[Representation]): List of representation
+            trait based representations to add.
+
+    """
+    repres = instance.data.setdefault(TRAIT_INSTANCE_KEY, [])
+    repres.extend(representations)
+
+
+def set_trait_representations(
+        instance: pyblish.api.Instance,
+        representations: list[Representation]
+) -> None:
+    """Set trait representations to instance.
+
+    Args:
+        instance (pyblish.api.Instance): Instance to set trait
+            representations to.
+        representations (list[Representation]): List of trait
+            based representations.
+
+    """
+    instance.data[TRAIT_INSTANCE_KEY] = representations
+
+
+def get_trait_representations(
+        instance: pyblish.api.Instance) -> list[Representation]:
+    """Get trait representations from instance.
+
+    Args:
+        instance (pyblish.api.Instance): Instance to get trait
+            representations from.
+
+    Returns:
+        list[Representation]: List of representation names.
+
+    """
+    return instance.data.get(TRAIT_INSTANCE_KEY, [])

client/ayon_core/pipeline/traits/README.md

@@ -0,0 +1,453 @@
+# Representations and traits
+
+## Introduction
+
+The Representation is the lowest level entity, describing the concrete data chunk that
+pipeline can act on. It can be a specific file or just a set of metadata. Idea is that one
+product version can have multiple representations - **Image** product can be jpeg or tiff, both formats are representation of the same source.
+
+### Brief look into the past (and current state)
+
+So far, representation was defined as a dict-like structure:
+```python
+{
+    "name": "foo",
+    "ext": "exr",
+    "files": ["foo_001.exr", "foo_002.exr"],
+    "stagingDir": "/bar/dir"
+}
+```
+
+This is minimal form, but it can have additional keys like `frameStart`, `fps`, `resolutionWidth`, and more. Thare is also `tags` key that can hold `review`, `thumbnail`, `delete`, `toScanline` and other tags that are controlling the processing.
+
+This will be *"translated"* to the similar structure in the database:
+
+```python
+{
+    "name": "foo",
+    "version_id": "...",
+    "files": [
+        {
+            "id": ...,
+            "hash": ...,
+            "name": "foo_001.exr",
+            "path": "{root[work]}/bar/dir/foo_001.exr",
+            "size": 1234,
+            "hash_type": "...",
+        },
+        ...
+    ],
+    "attrib": {
+        "path": "root/bar/dir/foo_001.exr",
+        "template": "{root[work]}/{project[name]}...",
+    },
+    "data": {
+        "context": {
+            "ext": "exr",
+            "root": {...},
+            ...
+    },
+    "active": True
+    ...
+
+}
+```
+
+There are also some assumptions and limitations - like that if `files` in the
+representation are list they need to be sequence of files (it can't be a bunch of
+unrelated files).
+
+This system is very flexible in one way, but it lacks a few very important things:
+
+- it is not clearly defined — you can add easily keys, values, tags but without 
+unforeseeable
+consequences
+- it cannot handle "bundles" — multiple files that need to be versioned together and 
+belong together
+- it cannot describe important information that you can't get from the file itself, or
+it is very expensive (like axis orientation and units from alembic files)
+
+
+### New Representation model
+
+The idea about a new representation model is about solving points mentioned
+above and also adding some benefits, like consistent IDE hints, typing, built-in
+ validators and much more.
+
+### Design
+
+The new representation is "just" a dictionary of traits. Trait can be anything provided
+it is based on `TraitBase`. It shouldn't really duplicate information that is
+available at the moment of loading (or any usage) by other means. It should contain 
+information that couldn't be determined by the file, or the AYON context. Some of 
+those traits are aligned with [OpenAssetIO Media Creation](https://github.com/OpenAssetIO/OpenAssetIO-MediaCreation) with hopes of maintained compatibility (it 
+should be easy enough to convert between OpenAssetIO Traits and AYON Traits).
+
+#### Details: Representation
+
+`Representation` has methods to deal with adding, removing, getting
+traits. It has all the usual stuff like `get_trait()`, `add_trait()`,
+`remove_trait()`, etc. But it also has plural forms so you can get/set
+several traits at the same time with `get_traits()` and so on.
+`Representation` also behaves like dictionary. so you can access/set
+traits in the same way as you would do with dict:
+
+```python
+# import Image trait
+from ayon_core.pipeline.traits import Image, Tagged, Representation
+
+
+# create new representation with name "foo" and add Image trait to it
+rep = Representation(name="foo", traits=[Image()])
+
+# you can add another trait like so
+rep.add_trait(Tagged(tags=["tag"]))
+
+# or you can
+rep[Tagged.id] = Tagged(tags=["tag"])
+
+# and getting them in analogous
+image = rep.get_trait(Image)
+
+# or
+image = rep[Image.id]
+```
+
+> [!NOTE]
+> Trait and their ids — every Trait has its id as a string with a
+> version appended - so **Image** has `ayon.2d.Image.v1`. This is used on
+> several places (you see its use above for indexing traits). When querying,
+> you can also omit the version at the end, and it will try its best to find
+> the latest possible version. More on that in [Traits]()
+
+You can construct the `Representation` from dictionary (for example,
+serialized as JSON) using `Representation.from_dict()`, or you can
+serialize `Representation` to dict to store with `Representation.traits_as_dict()`.
+
+Every time representation is created, a new id is generated. You can pass existing
+id when creating the new representation instance.
+
+##### Equality
+
+Two Representations are equal if:
+- their names are the same
+- their IDs are the same
+- they have the same traits
+- the traits have the same values
+
+##### Validation
+
+Representation has `validate()` method that will run `validate()` on
+all it's traits.
+
+#### Details: Traits
+
+As mentioned there are several traits defined directly in **ayon-core**. They are namespaced
+to different packages based on their use:
+
+| namespace         | trait                | description                                                                                              |
+|-------------------|----------------------|----------------------------------------------------------------------------------------------------------|
+| color             | ColorManaged         | hold color management information                                                                        |
+| content           | MimeType             | use MIME type (RFC 2046) to describe content (like image/jpeg)                                           |
+|                   | LocatableContent     | describe some location (file or URI)                                                                     |
+|                   | FileLocation         | path to file, with size and checksum                                                                     |
+|                   | FileLocations        | list of `FileLocation`                                                                                   |
+|                   | RootlessLocation     | Path where root is replaced with AYON root token                                                         |
+|                   | Compressed           | describes compression (of file or other)                                                                 |
+|                   | Bundle               | list of list of Traits - compound of inseparable "sub-representations"                                   |
+|                   | Fragment             | compound type marking the representation as a part of larger group of representations                    |
+| cryptography      | DigitallySigned      | Type traits marking data to be digitally signed                                                          |
+|                   | PGPSigned            | Representation is signed by [PGP](https://www.openpgp.org/)                                              |
+| lifecycle         | Transient            | Marks the representation to be temporary - not to be stored.                                             |
+|                   | Persistent           | Representation should be integrated (stored). Opposite of Transient.                                     |
+| meta              | Tagged               | holds list of tag strings.                                                                               |
+|                   | TemplatePath         | Template consisted of tokens/keys and data to be used to resolve the template into string                |
+|                   | Variant              | Used to differentiate between data variants of the same output (mp4 as h.264 and h.265 for example)      |
+|                   | KeepOriginalLocation | Marks the representation to keep the original location of the file                                       |
+|                   | KeepOriginalName     | Marks the representation to keep the original name of the file                                           |
+|                   | SourceApplication    | Holds information about producing application, about it's version, variant and platform.                 |
+|                   | IntendedUse          | For specifying the intended use of the representation if it cannot be easily determined by other traits. |
+| three dimensional | Spatial              | Spatial information like up-axis, units and handedness.                                                  |
+|                   | Geometry             | Type trait to mark the representation as a geometry.                                                     |
+|                   | Shader               | Type trait to mark the representation as a Shader.                                                       |
+|                   | Lighting             | Type trait to mark the representation as Lighting.                                                       |
+|                   | IESProfile           | States that the representation is IES Profile.                                                           |
+| time              | FrameRanged          | Contains start and end frame information with in and out.                                                |                                                
+|                   | Handless             | define additional frames at the end or beginning and if those frames are inclusive of the range or not.  |  
+|                   | Sequence             | Describes sequence of frames and how the frames are defined in that sequence.                            |                            
+|                   | SMPTETimecode        | Adds timecode information in SMPTE format.                                                               |                                                               
+|                   | Static               | Marks the content as not time-variant.                                                                   |                                                                   
+| two dimensional   | Image                | Type traits of image.                                                                                    |                                                                                    
+|                   | PixelBased           | Defines resolution and pixel aspect for the image data.                                                  |                                                  
+|                   | Planar               | Whether pixel data is in planar configuration or packed.                                                 |                                            
+|                   | Deep                 | Image encodes deep pixel data.                                                                           |                                                                           
+|                   | Overscan             | holds overscan/underscan information (added pixels to bottom/sides).                                     |                                      
+|                   | UDIM                 | Representation is UDIM tile set.                                                                         |                                                                          
+
+Traits are Python data classes with optional
+validation and helper methods. If they implement `TraitBase.validate(Representation)` method, they can validate against all other traits
+in the representation if needed. 
+
+> [!NOTE]
+> They could be easily converted to [Pydantic models](https://docs.pydantic.dev/latest/) but since this must run in diverse Python environments inside DCC, we cannot
+> easily resolve pydantic-core dependency (as it is binary written in Rust).
+
+> [!NOTE]
+> Every trait has id, name and some human-readable description. Every trait
+> also has `persistent` property that is by default set to True. This
+> Controls whether this trait should be stored with the persistent representation
+> or not. Useful for traits to be used just to control the publishing process.
+
+## Examples
+
+Create a simple image representation to be integrated by AYON:
+
+```python
+from pathlib import Path
+from ayon_core.pipeline.traits import (
+    FileLocation,
+    Image,
+    PixelBased,
+    Persistent,
+    Representation,
+    Static,
+
+    TraitValidationError,
+)
+    
+rep = Representation(name="reference image", traits=[
+    FileLocation(
+        file_path=Path("/foo/bar/baz.exr"),
+        file_size=1234,
+        file_hash="sha256:...",
+    ),
+    Image(),
+    PixelBased(
+        display_window_width=1920,
+        display_window_height=1080,
+        pixel_aspect_ratio=1.0,
+    ),
+    Persistent(),
+    Static()
+])
+
+# validate the representation
+
+try:
+    rep.validate()
+except TraitValidationError as e:
+    print(f"Representation {rep.name} is invalid: {e}")
+
+```
+
+To work with the resolution of such representation:
+
+```python
+
+try:
+    width = rep.get_trait(PixelBased).display_window_width
+    # or like this:
+    height = rep[PixelBased.id].display_window_height
+except MissingTraitError:
+    print(f"resolution isn't set on {rep.name}")
+```
+
+Accessing non-existent traits will result in an exception. To test if
+the representation has some specific trait, you can use `.contains_trait()` method.
+
+
+You can also prepare the whole representation data as a dict and
+create it from it:
+
+```python
+rep_dict = {
+        "ayon.content.FileLocation.v1": {
+            "file_path": Path("/path/to/file"),
+            "file_size": 1024,
+            "file_hash": None,
+        },
+        "ayon.two_dimensional.Image": {},
+        "ayon.two_dimensional.PixelBased": {
+            "display_window_width": 1920,
+            "display_window_height": 1080,
+            "pixel_aspect_ratio": 1.0,
+        },
+        "ayon.two_dimensional.Planar": {
+            "planar_configuration": "RGB",
+        }
+}
+
+rep = Representation.from_dict(name="image", rep_dict)
+
+```
+
+
+## Addon specific traits
+
+Addon can define its own traits. To do so, it needs to implement `ITraits` interface:
+
+```python
+from ayon_core.pipeline.traits import TraitBase
+from ayon_core.addon import (
+    AYONAddon,
+    ITraits,
+)
+
+class MyTraitFoo(TraitBase):
+    id = "myaddon.mytrait.foo.v1"
+    name = "My Trait Foo"
+    description = "This is my trait foo"
+    persistent = True
+
+
+class MyTraitBar(TraitBase):
+    id = "myaddon.mytrait.bar.v1"
+    name = "My Trait Bar"
+    description = "This is my trait bar"
+    persistent = True
+
+    
+class MyAddon(AYONAddon, ITraits):
+    def __init__(self):
+        super().__init__()
+
+    def get_addon_traits(self):
+        return [
+            MyTraitFoo,
+            MyTraitBar,
+        ]
+```
+## Usage in Loaders
+
+In loaders, you can implement `is_compatible_loader()` method to check if the
+representation is compatible with the loader. You can use `Representation.from_dict()` to
+create the representation from the context. You can also use `Representation.contains_traits()`
+to check if the representation contains the required traits. You can even check for specific
+values in the traits.
+
+You can use similar concepts directly in the `load()` method to get the traits. Here is
+an example of how to use the traits in the hypothetical Maya loader:
+
+```python
+"""Alembic loader using traits."""
+from __future__ import annotations
+import json
+from typing import Any, TypeVar, Type
+from ayon_maya.api.plugin import MayaLoader
+from ayon_core.pipeline.traits import (
+    FileLocation,
+    Spatial,
+
+    Representation,
+    TraitBase,
+)
+
+T = TypeVar("T", bound=TraitBase)
+
+
+class AlembicTraitLoader(MayaLoader):
+    """Alembic loader using traits."""
+    label = "Alembic Trait Loader"
+    ...
+
+    required_traits: list[T] = [
+        FileLocation,
+        Spatial,
+    ]
+
+    @staticmethod
+    def is_compatible_loader(context: dict[str, Any]) -> bool:
+        traits_raw = context["representation"].get("traits")
+        if not traits_raw:
+            return False
+
+        # construct Representation object from the context
+        representation = Representation.from_dict(
+            name=context["representation"]["name"],
+            representation_id=context["representation"]["id"],
+            trait_data=json.loads(traits_raw),
+        )
+
+        # check if the representation is compatible with this loader
+        if representation.contains_traits(AlembicTraitLoader.required_traits):
+            # you can also check for specific values in traits here
+            return True
+        return False
+
+    ...
+```
+
+## Usage Publishing plugins
+
+You can create the representations in the same way as mentioned in the examples above.
+Straightforward way is to use `Representation` class and add the traits to it. Collect
+traits in the list and then pass them to the `Representation` constructor. You should add
+the new Representation to the instance data using `add_trait_representations()` function.
+
+```python
+class SomeExtractor(Extractor):
+    """Some extractor."""
+    ...
+
+    def extract(self, instance: Instance) -> None:
+        """Extract the data."""
+        # get the path to the file
+        path = self.get_path(instance)
+
+        # create the representation
+        traits: list[TraitBase] = [
+            Geometry(),
+            MimeType(mime_type="application/abc"),
+            Persistent(),
+            Spatial(
+                up_axis=cmds.upAxis(q=True, axis=True),
+                meters_per_unit=maya_units_to_meters_per_unit(
+                    instance.context.data["linearUnits"]),
+                handedness="right",
+            ),
+        ]
+
+        if instance.data.get("frameStart"):
+            traits.append(
+                FrameRanged(
+                    frame_start=instance.data["frameStart"],
+                    frame_end=instance.data["frameEnd"],
+                    frames_per_second=instance.context.data["fps"],
+                )
+            )
+
+        representation = Representation(
+            name="alembic",
+            traits=[
+                FileLocation(
+                    file_path=Path(path),
+                    file_size=os.path.getsize(path),
+                    file_hash=get_file_hash(Path(path))
+                ),
+                *traits],
+        )
+
+        add_trait_representations(
+            instance,
+            [representation],
+        )
+        ...
+```
+
+## Developer notes
+
+Adding new trait-based representations in to the publishing Instance and working with them is using
+a set of helper function defined in `ayon_core.pipeline.publish` module. These are:
+
+* add_trait_representations
+* get_trait_representations
+* has_trait_representations
+* set_trait_representations
+
+And their main purpose is to handle the key under which the representation
+is stored in the instance data. This is done to avoid name clashes with
+other representations. The key is defined in the `AYON_PUBLISH_REPRESENTATION_KEY`.
+It is strongly recommended to use those functions instead of
+directly accessing the instance data. This is to ensure that the
+code will work even if the key is changed in the future.
+

client/ayon_core/pipeline/traits/__init__.py

@@ -0,0 +1,112 @@
+"""Trait classes for the pipeline."""
+from .color import ColorManaged
+from .content import (
+    Bundle,
+    Compressed,
+    FileLocation,
+    FileLocations,
+    Fragment,
+    LocatableContent,
+    MimeType,
+    RootlessLocation,
+)
+from .cryptography import DigitallySigned, PGPSigned
+from .lifecycle import Persistent, Transient
+from .meta import (
+    IntendedUse,
+    KeepOriginalLocation,
+    SourceApplication,
+    Tagged,
+    TemplatePath,
+    Variant,
+)
+from .representation import Representation
+from .temporal import (
+    FrameRanged,
+    GapPolicy,
+    Handles,
+    Sequence,
+    SMPTETimecode,
+    Static,
+)
+from .three_dimensional import Geometry, IESProfile, Lighting, Shader, Spatial
+from .trait import (
+    MissingTraitError,
+    TraitBase,
+    TraitValidationError,
+)
+from .two_dimensional import (
+    UDIM,
+    Deep,
+    Image,
+    Overscan,
+    PixelBased,
+    Planar,
+)
+from .utils import (
+    get_sequence_from_files,
+)
+
+__all__ = [  # noqa: RUF022
+    # base
+    "Representation",
+    "TraitBase",
+    "MissingTraitError",
+    "TraitValidationError",
+
+    # color
+    "ColorManaged",
+
+    # content
+    "Bundle",
+    "Compressed",
+    "FileLocation",
+    "FileLocations",
+    "Fragment",
+    "LocatableContent",
+    "MimeType",
+    "RootlessLocation",
+
+    # cryptography
+    "DigitallySigned",
+    "PGPSigned",
+
+    # life cycle
+    "Persistent",
+    "Transient",
+
+    # meta
+    "IntendedUse",
+    "KeepOriginalLocation",
+    "SourceApplication",
+    "Tagged",
+    "TemplatePath",
+    "Variant",
+
+    # temporal
+    "FrameRanged",
+    "GapPolicy",
+    "Handles",
+    "Sequence",
+    "SMPTETimecode",
+    "Static",
+
+    # three-dimensional
+    "Geometry",
+    "IESProfile",
+    "Lighting",
+    "Shader",
+    "Spatial",
+
+    # two-dimensional
+    "Compressed",
+    "Deep",
+    "Image",
+    "Overscan",
+    "PixelBased",
+    "Planar",
+    "UDIM",
+
+    # utils
+    "get_sequence_from_files",
+]

client/ayon_core/pipeline/traits/color.py

@@ -0,0 +1,30 @@
+"""Color-management-related traits."""
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import ClassVar, Optional
+
+from .trait import TraitBase
+
+
+@dataclass
+class ColorManaged(TraitBase):
+    """Color managed trait.
+
+    Holds color management information. Can be used with Image-related
+    traits to define color space and config.
+
+    Sync with OpenAssetIO MediaCreation Traits.
+
+    Attributes:
+        color_space (str): An OCIO colorspace name available
+            in the "current" OCIO context.
+        config (str): An OCIO config name defining color space.
+    """
+
+    id: ClassVar[str] = "ayon.color.ColorManaged.v1"
+    name: ClassVar[str] = "ColorManaged"
+    color_space: str
+    description: ClassVar[str] = "Color Managed trait."
+    persistent: ClassVar[bool] = True
+    config: Optional[str] = None

client/ayon_core/pipeline/traits/content.py

@@ -0,0 +1,485 @@
+"""Content traits for the pipeline."""
+from __future__ import annotations
+
+import contextlib
+import re
+from dataclasses import dataclass
+
+# TCH003 is there because Path in TYPECHECKING will fail in tests
+from pathlib import Path  # noqa: TCH003
+from typing import ClassVar, Generator, Optional
+
+from .representation import Representation
+from .temporal import FrameRanged, Handles, Sequence
+from .trait import (
+    MissingTraitError,
+    TraitBase,
+    TraitValidationError,
+)
+from .two_dimensional import UDIM
+from .utils import get_sequence_from_files
+
+
+@dataclass
+class MimeType(TraitBase):
+    """MimeType trait model.
+
+    This model represents a mime type trait. For example, image/jpeg.
+    It is used to describe the type of content in a representation regardless
+    of the file extension.
+
+    For more information, see RFC 2046 and RFC 4288 (and related RFCs).
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        mime_type (str): Mime type like image/jpeg.
+    """
+
+    name: ClassVar[str] = "MimeType"
+    description: ClassVar[str] = "MimeType Trait Model"
+    id: ClassVar[str] = "ayon.content.MimeType.v1"
+    persistent: ClassVar[bool] = True
+    mime_type: str
+
+
+@dataclass
+class LocatableContent(TraitBase):
+    """LocatableContent trait model.
+
+    This model represents a locatable content trait. Locatable content
+    is content that has a location. It doesn't have to be a file - it could
+    be a URL or some other location.
+
+    Sync with OpenAssetIO MediaCreation Traits.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        location (str): Location.
+        is_templated (Optional[bool]): Is the location templated?
+            Default is None.
+    """
+
+    name: ClassVar[str] = "LocatableContent"
+    description: ClassVar[str] = "LocatableContent Trait Model"
+    id: ClassVar[str] = "ayon.content.LocatableContent.v1"
+    persistent: ClassVar[bool] = True
+    location: str
+    is_templated: Optional[bool] = None
+
+
+@dataclass
+class FileLocation(TraitBase):
+    """FileLocation trait model.
+
+    This model represents a file path. It is a specialization of the
+    LocatableContent trait. It is adding optional file size and file hash
+    for easy access to file information.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        file_path (str): File path.
+        file_size (Optional[int]): File size in bytes.
+        file_hash (Optional[str]): File hash.
+    """
+
+    name: ClassVar[str] = "FileLocation"
+    description: ClassVar[str] = "FileLocation Trait Model"
+    id: ClassVar[str] = "ayon.content.FileLocation.v1"
+    persistent: ClassVar[bool] = True
+    file_path: Path
+    file_size: Optional[int] = None
+    file_hash: Optional[str] = None
+
+
+@dataclass
+class FileLocations(TraitBase):
+    """FileLocation trait model.
+
+    This model represents a file path. It is a specialization of the
+    LocatableContent trait. It is adding optional file size and file hash
+    for easy access to file information.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        file_paths (list of FileLocation): File locations.
+
+    """
+
+    name: ClassVar[str] = "FileLocations"
+    description: ClassVar[str] = "FileLocations Trait Model"
+    id: ClassVar[str] = "ayon.content.FileLocations.v1"
+    persistent: ClassVar[bool] = True
+    file_paths: list[FileLocation]
+
+    def get_files(self) -> Generator[Path, None, None]:
+        """Get all file paths from the trait.
+
+        This method will return all file paths from the trait.
+
+        Yields:
+            Path: List of file paths.
+
+        """
+        for file_location in self.file_paths:
+            yield file_location.file_path
+
+    def get_file_location_for_frame(
+            self,
+            frame: int,
+            sequence_trait: Optional[Sequence] = None,
+        ) -> Optional[FileLocation]:
+        """Get a file location for a frame.
+
+        This method will return the file location for a given frame. If the
+        frame is not found in the file paths, it will return None.
+
+        Args:
+            frame (int): Frame to get the file location for.
+            sequence_trait (Sequence): Sequence trait to get the
+                frame range specs from.
+
+        Returns:
+            Optional[FileLocation]: File location for the frame.
+
+        """
+        frame_regex = re.compile(r"\.(?P<index>(?P<padding>0*)\d+)\.\D+\d?$")
+        if sequence_trait and sequence_trait.frame_regex:
+            frame_regex = sequence_trait.get_frame_pattern()
+
+        for location in self.file_paths:
+            result = re.search(frame_regex, location.file_path.name)
+            if result:
+                frame_index = int(result.group("index"))
+                if frame_index == frame:
+                    return location
+        return None
+
+    def validate_trait(self, representation: Representation) -> None:
+        """Validate the trait.
+
+        This method validates the trait against others in the representation.
+        In particular, it checks that the sequence trait is present, and if
+        so, it will compare the frame range to the file paths.
+
+        Args:
+            representation (Representation): Representation to validate.
+
+        Raises:
+            TraitValidationError: If the trait is invalid within the
+                representation.
+
+        """
+        super().validate_trait(representation)
+        if len(self.file_paths) == 0:
+            # If there are no file paths, we can't validate
+            msg = "No file locations defined (empty list)"
+            raise TraitValidationError(self.name, msg)
+        if representation.contains_trait(FrameRanged):
+            self._validate_frame_range(representation)
+        if not representation.contains_trait(Sequence) \
+                and not representation.contains_trait(UDIM):
+            # we have multiple files, but it is not a sequence
+            # or UDIM tile set what is it then? If the files are not related
+            # to each other, then this representation is invalid.
+            msg = (
+                 "Multiple file locations defined, but no Sequence "
+                 "or UDIM trait defined. If the files are not related to "
+                 "each other, the representation is invalid."
+            )
+            raise TraitValidationError(self.name, msg)
+
+    def _validate_frame_range(self, representation: Representation) -> None:
+        """Validate the frame range against the file paths.
+
+        If the representation contains a FrameRanged trait, this method will
+        validate the frame range against the file paths. If the frame range
+        does not match the file paths, the trait is invalid. It takes into
+        account the Handles and Sequence traits.
+
+        Args:
+            representation (Representation): Representation to validate.
+
+        Raises:
+            TraitValidationError: If the trait is invalid within the
+                representation.
+
+        """
+        tmp_frame_ranged: FrameRanged = get_sequence_from_files(
+                    [f.file_path for f in self.file_paths])
+
+        frames_from_spec: list[int] = []
+        with contextlib.suppress(MissingTraitError):
+            sequence: Sequence = representation.get_trait(Sequence)
+            frame_regex = sequence.get_frame_pattern()
+            if sequence.frame_spec:
+                frames_from_spec = sequence.get_frame_list(
+                    self, frame_regex)
+
+        frame_start_with_handles, frame_end_with_handles = \
+            self._get_frame_info_with_handles(representation, frames_from_spec)
+
+        if frame_start_with_handles \
+                and tmp_frame_ranged.frame_start != frame_start_with_handles:
+            # If the detected frame range does not match the combined
+            # FrameRanged and Handles trait, the
+            # trait is invalid.
+            msg = (
+                f"Frame range defined by {self.name} "
+                f"({tmp_frame_ranged.frame_start}-"
+                f"{tmp_frame_ranged.frame_end}) "
+                "in files does not match "
+                "frame range "
+                f"({frame_start_with_handles}-"
+                f"{frame_end_with_handles}) defined in FrameRanged trait."
+            )
+
+            raise TraitValidationError(self.name, msg)
+
+        if frames_from_spec:
+            if len(frames_from_spec) != len(self.file_paths):
+                # If the number of file paths does not match the frame range,
+                # the trait is invalid
+                msg = (
+                    f"Number of file locations ({len(self.file_paths)}) "
+                    "does not match frame range defined by frame spec "
+                    "on Sequence trait: "
+                    f"({len(frames_from_spec)})"
+                )
+                raise TraitValidationError(self.name, msg)
+            # if there is a frame spec on the Sequence trait,
+            # we should not validate the frame range from the files.
+            # the rest is validated by Sequence validators.
+            return
+
+        length_with_handles: int = (
+            frame_end_with_handles - frame_start_with_handles + 1
+        )
+
+        if len(self.file_paths) != length_with_handles:
+            # If the number of file paths does not match the frame range,
+            # the trait is invalid
+            msg = (
+                f"Number of file locations ({len(self.file_paths)}) "
+                "does not match frame range "
+                f"({length_with_handles})"
+            )
+            raise TraitValidationError(self.name, msg)
+
+        frame_ranged: FrameRanged = representation.get_trait(FrameRanged)
+
+        if frame_start_with_handles != tmp_frame_ranged.frame_start or \
+                frame_end_with_handles != tmp_frame_ranged.frame_end:
+            # If the frame range does not match the FrameRanged trait, the
+            # trait is invalid. Note that we don't check the frame rate
+            # because it is not stored in the file paths and is not
+            # determined by `get_sequence_from_files`.
+            msg = (
+                "Frame range "
+                f"({frame_ranged.frame_start}-{frame_ranged.frame_end}) "
+                "in sequence trait does not match "
+                "frame range "
+                f"({tmp_frame_ranged.frame_start}-"
+                f"{tmp_frame_ranged.frame_end}) "
+            )
+            raise TraitValidationError(self.name, msg)
+
+    @staticmethod
+    def _get_frame_info_with_handles(
+            representation: Representation,
+            frames_from_spec: list[int]) -> tuple[int, int]:
+        """Get the frame range with handles from the representation.
+
+        This will return frame start and frame end with handles calculated
+        in if there actually is the Handles trait in the representation.
+
+        Args:
+            representation (Representation): Representation to get the frame
+                range from.
+            frames_from_spec (list[int]): List of frames from the frame spec.
+                This list is modified in place to take into
+                account the handles.
+
+        Mutates:
+            frames_from_spec: List of frames from the frame spec.
+
+        Returns:
+            tuple[int, int]: Start and end frame with handles.
+
+        """
+        frame_start = frame_end = 0
+        frame_start_handle = frame_end_handle = 0
+        # If there is no sequence trait, we can't validate it
+        if frames_from_spec and representation.contains_trait(FrameRanged):
+            # if there is no FrameRanged trait (but really there should be)
+            # we can use the frame range from the frame spec
+            frame_start = min(frames_from_spec)
+            frame_end = max(frames_from_spec)
+
+        # Handle the frame range
+        with contextlib.suppress(MissingTraitError):
+            frame_start = representation.get_trait(FrameRanged).frame_start
+            frame_end = representation.get_trait(FrameRanged).frame_end
+
+        # Handle the handles :P
+        with contextlib.suppress(MissingTraitError):
+            handles: Handles = representation.get_trait(Handles)
+            if not handles.inclusive:
+                # if handless are exclusive, we need to adjust the frame range
+                frame_start_handle = handles.frame_start_handle or 0
+                frame_end_handle = handles.frame_end_handle or 0
+                if frames_from_spec:
+                    frames_from_spec.extend(
+                        range(frame_start - frame_start_handle, frame_start)
+                    )
+                    frames_from_spec.extend(
+                        range(frame_end + 1, frame_end_handle + frame_end + 1)
+                    )
+
+        frame_start_with_handles = frame_start - frame_start_handle
+        frame_end_with_handles = frame_end + frame_end_handle
+
+        return frame_start_with_handles, frame_end_with_handles
+
+
+@dataclass
+class RootlessLocation(TraitBase):
+    """RootlessLocation trait model.
+
+    RootlessLocation trait is a trait that represents a file path that is
+    without a specific root. To get the absolute path, the root needs to be
+    resolved by AYON. Rootless path can be used on multiple platforms.
+
+    Example::
+
+        RootlessLocation(
+            rootless_path="{root[work]}/project/asset/asset.jpg"
+        )
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        rootless_path (str): Rootless path.
+    """
+
+    name: ClassVar[str] = "RootlessLocation"
+    description: ClassVar[str] = "RootlessLocation Trait Model"
+    id: ClassVar[str] = "ayon.content.RootlessLocation.v1"
+    persistent: ClassVar[bool] = True
+    rootless_path: str
+
+
+@dataclass
+class Compressed(TraitBase):
+    """Compressed trait model.
+
+    This trait can hold information about compressed content. What type
+    of compression is used.
+
+    Example::
+
+        Compressed("gzip")
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        compression_type (str): Compression type.
+    """
+
+    name: ClassVar[str] = "Compressed"
+    description: ClassVar[str] = "Compressed Trait"
+    id: ClassVar[str] = "ayon.content.Compressed.v1"
+    persistent: ClassVar[bool] = True
+    compression_type: str
+
+
+@dataclass
+class Bundle(TraitBase):
+    """Bundle trait model.
+
+    This model list of independent Representation traits
+    that are bundled together. This is useful for representing
+    a collection of sub-entities that are part of a single
+    entity. You can easily reconstruct representations from
+    the bundle.
+
+    Example::
+
+            Bundle(
+                items=[
+                    [
+                        MimeType(mime_type="image/jpeg"),
+                        FileLocation(file_path="/path/to/file.jpg")
+                    ],
+                    [
+
+                        MimeType(mime_type="image/png"),
+                        FileLocation(file_path="/path/to/file.png")
+                    ]
+                ]
+            )
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        items (list[list[TraitBase]]): List of representations.
+    """
+
+    name: ClassVar[str] = "Bundle"
+    description: ClassVar[str] = "Bundle Trait"
+    id: ClassVar[str] = "ayon.content.Bundle.v1"
+    persistent: ClassVar[bool] = True
+    items: list[list[TraitBase]]
+
+    def to_representations(self) -> Generator[Representation]:
+        """Convert a bundle to representations.
+
+        Yields:
+            Representation: Representation of the bundle.
+
+        """
+        for idx, item in enumerate(self.items):
+            yield Representation(name=f"{self.name} {idx}", traits=item)
+
+
+@dataclass
+class Fragment(TraitBase):
+    """Fragment trait model.
+
+    This model represents a fragment trait. A fragment is a part of
+    a larger entity that is represented by another representation.
+
+    Example::
+
+        main_representation = Representation(name="parent",
+            traits=[],
+        )
+        fragment_representation = Representation(
+            name="fragment",
+            traits=[
+                Fragment(parent=main_representation.id),
+            ]
+        )
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be namespaced trait name with version
+        parent (str): Parent representation id.
+    """
+
+    name: ClassVar[str] = "Fragment"
+    description: ClassVar[str] = "Fragment Trait"
+    id: ClassVar[str] = "ayon.content.Fragment.v1"
+    persistent: ClassVar[bool] = True
+    parent: str

client/ayon_core/pipeline/traits/cryptography.py

@@ -0,0 +1,42 @@
+"""Cryptography traits."""
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import ClassVar, Optional
+
+from .trait import TraitBase
+
+
+@dataclass
+class DigitallySigned(TraitBase):
+    """Digitally signed trait.
+
+    This type trait means that the data is digitally signed.
+
+    Attributes:
+        signature (str): Digital signature.
+    """
+
+    id: ClassVar[str] = "ayon.cryptography.DigitallySigned.v1"
+    name: ClassVar[str] = "DigitallySigned"
+    description: ClassVar[str] = "Digitally signed trait."
+    persistent: ClassVar[bool] = True
+
+
+@dataclass
+class PGPSigned(DigitallySigned):
+    """PGP signed trait.
+
+    This trait holds PGP (RFC-4880) signed data.
+
+    Attributes:
+        signed_data (str): Signed data.
+        clear_text (str): Clear text.
+    """
+
+    id: ClassVar[str] = "ayon.cryptography.PGPSigned.v1"
+    name: ClassVar[str] = "PGPSigned"
+    description: ClassVar[str] = "PGP signed trait."
+    persistent: ClassVar[bool] = True
+    signed_data: str
+    clear_text: Optional[str] = None

client/ayon_core/pipeline/traits/lifecycle.py

@@ -0,0 +1,77 @@
+"""Lifecycle traits."""
+from dataclasses import dataclass
+from typing import ClassVar
+
+from .trait import TraitBase, TraitValidationError
+
+
+@dataclass
+class Transient(TraitBase):
+    """Transient trait model.
+
+    Transient trait marks representation as transient. Such representations
+    are not persisted in the system.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with the version
+    """
+
+    name: ClassVar[str] = "Transient"
+    description: ClassVar[str] = "Transient Trait Model"
+    id: ClassVar[str] = "ayon.lifecycle.Transient.v1"
+    persistent: ClassVar[bool] = True  # see note in Persistent
+
+    def validate_trait(self, representation) -> None:  # noqa: ANN001
+        """Validate representation is not Persistent.
+
+        Args:
+            representation (Representation): Representation model.
+
+        Raises:
+            TraitValidationError: If representation is marked as both
+                Persistent and Transient.
+
+        """
+        if representation.contains_trait(Persistent):
+            msg = "Representation is marked as both Persistent and Transient."
+            raise TraitValidationError(self.name, msg)
+
+
+@dataclass
+class Persistent(TraitBase):
+    """Persistent trait model.
+
+    Persistent trait is opposite to transient trait. It marks representation
+    as persistent. Such representations are persisted in the system (e.g. in
+    the database).
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with the version
+    """
+
+    name: ClassVar[str] = "Persistent"
+    description: ClassVar[str] = "Persistent Trait Model"
+    id: ClassVar[str] = "ayon.lifecycle.Persistent.v1"
+    # Note that this affects the persistence of the trait itself, not
+    # the representation. This is a class variable, so it is shared
+    # among all instances of the class.
+    persistent: bool = True
+
+    def validate_trait(self, representation) -> None:  # noqa: ANN001
+        """Validate representation is not Transient.
+
+        Args:
+            representation (Representation): Representation model.
+
+        Raises:
+            TraitValidationError: If representation is marked
+                as both Persistent and Transient.
+
+        """
+        if representation.contains_trait(Transient):
+            msg = "Representation is marked as both Persistent and Transient."
+            raise TraitValidationError(self.name, msg)

client/ayon_core/pipeline/traits/meta.py

@@ -0,0 +1,162 @@
+"""Metadata traits."""
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import ClassVar, List, Optional
+
+from .trait import TraitBase
+
+
+@dataclass
+class Tagged(TraitBase):
+    """Tagged trait model.
+
+    This trait can hold a list of tags.
+
+    Example::
+
+        Tagged(tags=["tag1", "tag2"])
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        tags (List[str]): Tags.
+    """
+
+    name: ClassVar[str] = "Tagged"
+    description: ClassVar[str] = "Tagged Trait Model"
+    id: ClassVar[str] = "ayon.meta.Tagged.v1"
+    persistent: ClassVar[bool] = True
+    tags: List[str]
+
+
+@dataclass
+class TemplatePath(TraitBase):
+    """TemplatePath trait model.
+
+    This model represents a template path with formatting data.
+    Template path can be an Anatomy template and data is used to format it.
+
+    Example::
+
+        TemplatePath(template="path/{key}/file", data={"key": "to"})
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        template (str): Template path.
+        data (dict[str]): Formatting data.
+    """
+
+    name: ClassVar[str] = "TemplatePath"
+    description: ClassVar[str] = "Template Path Trait Model"
+    id: ClassVar[str] = "ayon.meta.TemplatePath.v1"
+    persistent: ClassVar[bool] = True
+    template: str
+    data: dict
+
+
+@dataclass
+class Variant(TraitBase):
+    """Variant trait model.
+
+    This model represents a variant of the representation.
+
+    Example::
+
+        Variant(variant="high")
+        Variant(variant="prores444)
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+        variant (str): Variant name.
+    """
+
+    name: ClassVar[str] = "Variant"
+    description: ClassVar[str] = "Variant Trait Model"
+    id: ClassVar[str] = "ayon.meta.Variant.v1"
+    persistent: ClassVar[bool] = True
+    variant: str
+
+
+@dataclass
+class KeepOriginalLocation(TraitBase):
+    """Keep files in its original location.
+
+    Note:
+        This is not a persistent trait.
+
+    """
+    name: ClassVar[str] = "KeepOriginalLocation"
+    description: ClassVar[str] = "Keep Original Location Trait Model"
+    id: ClassVar[str] = "ayon.meta.KeepOriginalLocation.v1"
+    persistent: ClassVar[bool] = False
+
+
+@dataclass
+class KeepOriginalName(TraitBase):
+    """Keep files in its original name.
+
+    Note:
+        This is not a persistent trait.
+    """
+
+    name: ClassVar[str] = "KeepOriginalName"
+    description: ClassVar[str] = "Keep Original Name Trait Model"
+    id: ClassVar[str] = "ayon.meta.KeepOriginalName.v1"
+    persistent: ClassVar[bool] = False
+
+
+@dataclass
+class SourceApplication(TraitBase):
+    """Metadata about the source (producing) application.
+
+    This can be useful in cases where this information is
+    needed, but it cannot be determined from other means - like
+    .txt files used for various motion tracking applications that
+    must be interpreted by the loader.
+
+    Note that this is not really connected to any logic in
+    ayon-applications addon.
+
+    Attributes:
+        application (str): Application name.
+        variant (str): Application variant.
+        version (str): Application version.
+        platform (str): Platform name (Windows, darwin, etc.).
+        host_name (str): AYON host name if applicable.
+    """
+
+    name: ClassVar[str] = "SourceApplication"
+    description: ClassVar[str] = "Source Application Trait Model"
+    id: ClassVar[str] = "ayon.meta.SourceApplication.v1"
+    persistent: ClassVar[bool] = True
+    application: str
+    variant: Optional[str] = None
+    version: Optional[str] = None
+    platform: Optional[str] = None
+    host_name: Optional[str] = None
+
+
+@dataclass
+class IntendedUse(TraitBase):
+    """Intended use of the representation.
+
+    This trait describes the intended use of the representation. It
+    can be used in cases where the other traits are not enough to
+    describe the intended use. For example, a txt file with tracking
+    points can be used as a corner pin in After Effect but not in Nuke.
+
+    Attributes:
+        use (str): Intended use description.
+
+    """
+    name: ClassVar[str] = "IntendedUse"
+    description: ClassVar[str] = "Intended Use Trait Model"
+    id: ClassVar[str] = "ayon.meta.IntendedUse.v1"
+    persistent: ClassVar[bool] = True
+    use: str

client/ayon_core/pipeline/traits/representation.py

@@ -0,0 +1,713 @@
+"""Defines the base trait model and representation."""
+from __future__ import annotations
+
+import contextlib
+import inspect
+import re
+import sys
+import uuid
+from functools import lru_cache
+from types import GenericAlias
+from typing import (
+    ClassVar,
+    Generic,
+    ItemsView,
+    Optional,
+    Type,
+    TypeVar,
+    Union,
+)
+
+from .trait import (
+    IncompatibleTraitVersionError,
+    LooseMatchingTraitError,
+    MissingTraitError,
+    TraitBase,
+    TraitValidationError,
+    UpgradableTraitError,
+)
+
+T = TypeVar("T", bound="TraitBase")
+
+
+def _get_version_from_id(_id: str) -> Optional[int]:
+    """Get the version from ID.
+
+    Args:
+        _id (str): ID.
+
+    Returns:
+        int: Version.
+
+    """
+    match = re.search(r"v(\d+)$", _id)
+    return int(match[1]) if match else None
+
+
+class Representation(Generic[T]):  # noqa: PLR0904
+    """Representation of products.
+
+    Representation defines a collection of individual properties that describe
+    the specific "form" of the product. A trait represents a set of
+    properties therefore, the Representation is a collection of traits.
+
+    It holds methods to add, remove, get, and check for the existence of a
+    trait in the representation.
+
+    Note:
+        `PLR0904` is the rule for checking the number of public methods
+        in a class.
+
+    Arguments:
+        name (str): Representation name. Must be unique within instance.
+        representation_id (str): Representation ID.
+    """
+
+    _data: dict[str, T]
+    _module_blacklist: ClassVar[list[str]] = [
+        "_", "builtins", "pydantic",
+    ]
+    name: str
+    representation_id: str
+
+    def __hash__(self):
+        """Return hash of the representation ID."""
+        return hash(self.representation_id)
+
+    def __getitem__(self, key: str) -> T:
+        """Get the trait by ID.
+
+        Args:
+            key (str): Trait ID.
+
+        Returns:
+            TraitBase: Trait instance.
+
+        """
+        return self.get_trait_by_id(key)
+
+    def __setitem__(self, key: str, value: T) -> None:
+        """Set the trait by ID.
+
+        Args:
+            key (str): Trait ID.
+            value (TraitBase): Trait instance.
+
+        """
+        with contextlib.suppress(KeyError):
+            self._data.pop(key)
+
+        self.add_trait(value)
+
+    def __delitem__(self, key: str) -> None:
+        """Remove the trait by ID.
+
+        Args:
+            key (str): Trait ID.
+
+
+        """
+        self.remove_trait_by_id(key)
+
+    def __contains__(self, key: str) -> bool:
+        """Check if the trait exists by ID.
+
+        Args:
+            key (str): Trait ID.
+
+        Returns:
+            bool: True if the trait exists, False otherwise.
+
+        """
+        return self.contains_trait_by_id(key)
+
+    def __iter__(self):
+        """Return the trait ID iterator."""
+        return iter(self._data)
+
+    def __str__(self):
+        """Return the representation name."""
+        return self.name
+
+    def items(self) -> ItemsView[str, T]:
+        """Return the traits as items."""
+        return ItemsView(self._data)
+
+    def add_trait(self, trait: T, *, exists_ok: bool = False) -> None:
+        """Add a trait to the Representation.
+
+        Args:
+            trait (TraitBase): Trait to add.
+            exists_ok (bool, optional): If True, do not raise an error if the
+                trait already exists. Defaults to False.
+
+        Raises:
+            ValueError: If the trait ID is not provided, or the trait already
+                exists.
+
+        """
+        if not hasattr(trait, "id"):
+            error_msg = f"Invalid trait {trait} - ID is required."
+            raise ValueError(error_msg)
+        if trait.id in self._data and not exists_ok:
+            error_msg = f"Trait with ID {trait.id} already exists."
+            raise ValueError(error_msg)
+        self._data[trait.id] = trait
+
+    def add_traits(
+            self, traits: list[T], *, exists_ok: bool = False) -> None:
+        """Add a list of traits to the Representation.
+
+        Args:
+            traits (list[TraitBase]): List of traits to add.
+            exists_ok (bool, optional): If True, do not raise an error if the
+                trait already exists. Defaults to False.
+
+        """
+        for trait in traits:
+            self.add_trait(trait, exists_ok=exists_ok)
+
+    def remove_trait(self, trait: Type[TraitBase]) -> None:
+        """Remove a trait from the data.
+
+        Args:
+            trait (TraitBase, optional): Trait class.
+
+        Raises:
+            ValueError: If the trait is not found.
+
+        """
+        try:
+            self._data.pop(str(trait.id))
+        except KeyError as e:
+            error_msg = f"Trait with ID {trait.id} not found."
+            raise ValueError(error_msg) from e
+
+    def remove_trait_by_id(self, trait_id: str) -> None:
+        """Remove a trait from the data by its ID.
+
+        Args:
+            trait_id (str): Trait ID.
+
+        Raises:
+            ValueError: If the trait is not found.
+
+        """
+        try:
+            self._data.pop(trait_id)
+        except KeyError as e:
+            error_msg = f"Trait with ID {trait_id} not found."
+            raise ValueError(error_msg) from e
+
+    def remove_traits(self, traits: list[Type[T]]) -> None:
+        """Remove a list of traits from the Representation.
+
+        If no trait IDs or traits are provided, all traits will be removed.
+
+        Args:
+            traits (list[TraitBase]): List of trait classes.
+
+        """
+        if not traits:
+            self._data = {}
+            return
+
+        for trait in traits:
+            self.remove_trait(trait)
+
+    def remove_traits_by_id(self, trait_ids: list[str]) -> None:
+        """Remove a list of traits from the Representation by their ID.
+
+        If no trait IDs or traits are provided, all traits will be removed.
+
+        Args:
+            trait_ids (list[str], optional): List of trait IDs.
+
+        """
+        for trait_id in trait_ids:
+            self.remove_trait_by_id(trait_id)
+
+    def has_traits(self) -> bool:
+        """Check if the Representation has any traits.
+
+        Returns:
+            bool: True if the Representation has any traits, False otherwise.
+
+        """
+        return bool(self._data)
+
+    def contains_trait(self, trait: Type[T]) -> bool:
+        """Check if the trait exists in the Representation.
+
+        Args:
+            trait (TraitBase): Trait class.
+
+        Returns:
+            bool: True if the trait exists, False otherwise.
+
+        """
+        return bool(self._data.get(str(trait.id)))
+
+    def contains_trait_by_id(self, trait_id: str) -> bool:
+        """Check if the trait exists using trait id.
+
+        Args:
+            trait_id (str): Trait ID.
+
+        Returns:
+            bool: True if the trait exists, False otherwise.
+
+        """
+        return bool(self._data.get(trait_id))
+
+    def contains_traits(self, traits: list[Type[T]]) -> bool:
+        """Check if the traits exist.
+
+        Args:
+            traits (list[TraitBase], optional): List of trait classes.
+
+        Returns:
+            bool: True if all traits exist, False otherwise.
+
+        """
+        return all(self.contains_trait(trait=trait) for trait in traits)
+
+    def contains_traits_by_id(self, trait_ids: list[str]) -> bool:
+        """Check if the traits exist by id.
+
+        If no trait IDs or traits are provided, it will check if the
+        representation has any traits.
+
+        Args:
+            trait_ids (list[str]): List of trait IDs.
+
+        Returns:
+            bool: True if all traits exist, False otherwise.
+
+        """
+        return all(
+            self.contains_trait_by_id(trait_id) for trait_id in trait_ids
+        )
+
+    def get_trait(self, trait: Type[T]) -> T:
+        """Get a trait from the representation.
+
+        Args:
+            trait (TraitBase, optional): Trait class.
+
+        Returns:
+            TraitBase: Trait instance.
+
+        Raises:
+            MissingTraitError: If the trait is not found.
+
+        """
+        try:
+            return self._data[str(trait.id)]
+        except KeyError as e:
+            msg = f"Trait with ID {trait.id} not found."
+            raise MissingTraitError(msg) from e
+
+    def get_trait_by_id(self, trait_id: str) -> T:
+        # sourcery skip: use-named-expression
+        """Get a trait from the representation by id.
+
+        Args:
+            trait_id (str): Trait ID.
+
+        Returns:
+            TraitBase: Trait instance.
+
+        Raises:
+            MissingTraitError: If the trait is not found.
+
+        """
+        version = _get_version_from_id(trait_id)
+        if version:
+            try:
+                return self._data[trait_id]
+            except KeyError as e:
+                msg = f"Trait with ID {trait_id} not found."
+                raise MissingTraitError(msg) from e
+
+        result = next(
+            (
+                self._data.get(trait_id)
+                for trait_id in self._data
+                if trait_id.startswith(trait_id)
+            ),
+            None,
+        )
+        if result is None:
+            msg = f"Trait with ID {trait_id} not found."
+            raise MissingTraitError(msg)
+        return result
+
+    def get_traits(self,
+                     traits: Optional[list[Type[T]]] = None
+     ) -> dict[str, T]:
+        """Get a list of traits from the representation.
+
+        If no trait IDs or traits are provided, all traits will be returned.
+
+        Args:
+            traits (list[TraitBase], optional): List of trait classes.
+
+        Returns:
+            dict: Dictionary of traits.
+
+        """
+        result: dict[str, T] = {}
+        if not traits:
+            for trait_id in self._data:
+                result[trait_id] = self.get_trait_by_id(trait_id=trait_id)
+            return result
+
+        for trait in traits:
+            result[str(trait.id)] = self.get_trait(trait=trait)
+        return result
+
+    def get_traits_by_ids(self, trait_ids: list[str]) -> dict[str, T]:
+        """Get a list of traits from the representation by their id.
+
+        If no trait IDs or traits are provided, all traits will be returned.
+
+        Args:
+            trait_ids (list[str]): List of trait IDs.
+
+        Returns:
+            dict: Dictionary of traits.
+
+        """
+        return {
+            trait_id: self.get_trait_by_id(trait_id)
+            for trait_id in trait_ids
+        }
+
+    def traits_as_dict(self) -> dict:
+        """Return the traits from Representation data as a dictionary.
+
+        Returns:
+            dict: Traits data dictionary.
+
+        """
+        return {
+            trait_id: trait.as_dict()
+            for trait_id, trait in self._data.items()
+            if trait and trait_id
+        }
+
+    def __len__(self):
+        """Return the length of the data."""
+        return len(self._data)
+
+    def __init__(
+            self,
+            name: str,
+            representation_id: Optional[str] = None,
+            traits: Optional[list[T]] = None):
+        """Initialize the data.
+
+        Args:
+            name (str): Representation name. Must be unique within instance.
+            representation_id (str, optional): Representation ID.
+            traits (list[TraitBase], optional): List of traits.
+
+        """
+        self.name = name
+        self.representation_id = representation_id or uuid.uuid4().hex
+        self._data = {}
+        if traits:
+            for trait in traits:
+                self.add_trait(trait)
+
+    @staticmethod
+    def _get_version_from_id(trait_id: str) -> Union[int, None]:
+        # sourcery skip: use-named-expression
+        """Check if the trait has a version specified.
+
+        Args:
+            trait_id (str): Trait ID.
+
+        Returns:
+            int: Trait version.
+            None: If the trait id does not have a version.
+
+        """
+        version_regex = r"v(\d+)$"
+        match = re.search(version_regex, trait_id)
+        return int(match[1]) if match else None
+
+    def __eq__(self, other: object) -> bool:  # noqa: PLR0911
+        """Check if the representation is equal to another.
+
+        Args:
+            other (Representation): Representation to compare.
+
+        Returns:
+            bool: True if the representations are equal, False otherwise.
+
+        """
+        if not isinstance(other, Representation):
+            return False
+
+        if self.representation_id != other.representation_id:
+            return False
+
+        if self.name != other.name:
+            return False
+
+        # number of traits
+        if len(self) != len(other):
+            return False
+
+        for trait_id, trait in self._data.items():
+            if trait_id not in other._data:
+                return False
+            if trait != other._data[trait_id]:
+                return False
+
+        return True
+
+    @classmethod
+    @lru_cache(maxsize=64)
+    def _get_possible_trait_classes_from_modules(
+            cls,
+            trait_id: str) -> set[type[T]]:
+        """Get possible trait classes from modules.
+
+        Args:
+            trait_id (str): Trait ID.
+
+        Returns:
+            set[type[T]]: Set of trait classes.
+
+        """
+        modules = sys.modules.copy()
+        filtered_modules = modules.copy()
+        for module_name in modules:
+            for bl_module in cls._module_blacklist:
+                if module_name.startswith(bl_module):
+                    filtered_modules.pop(module_name)
+
+        trait_candidates = set()
+        for module in filtered_modules.values():
+            if not module:
+                continue
+
+            for attr_name in dir(module):
+                klass = getattr(module, attr_name)
+                if not inspect.isclass(klass):
+                    continue
+                # This needs to be done because of the bug? In
+                # python ABCMeta, where ``issubclass`` is not working
+                # if it hits the GenericAlias (that is in fact
+                # tuple[int, int]). This is added to the scope by
+                # the ``types`` module.
+                if type(klass) is GenericAlias:
+                    continue
+                if issubclass(klass, TraitBase) \
+                        and str(klass.id).startswith(trait_id):
+                    trait_candidates.add(klass)
+        # I
+        return trait_candidates  # type: ignore[return-value]
+
+    @classmethod
+    @lru_cache(maxsize=64)
+    def _get_trait_class(
+            cls, trait_id: str) -> Union[Type[T], None]:
+        """Get the trait class with corresponding to given ID.
+
+        This method will search for the trait class in all the modules except
+        the blocklisted modules. There is some issue in Pydantic where
+        ``issubclass`` is not working properly, so we are excluding explicit
+        modules with offending classes. This list can be updated as needed to
+        speed up the search.
+
+        Args:
+            trait_id (str): Trait ID.
+
+        Returns:
+            Type[TraitBase]: Trait class.
+
+        """
+        version = cls._get_version_from_id(trait_id)
+
+        trait_candidates = cls._get_possible_trait_classes_from_modules(
+            trait_id
+        )
+        if not trait_candidates:
+            return None
+
+        for trait_class in trait_candidates:
+            if trait_class.id == trait_id:
+                # we found a direct match
+                return trait_class
+
+        # if we didn't find direct match, we will search for the highest
+        # version of the trait.
+        if not version:
+            # sourcery skip: use-named-expression
+            trait_versions = [
+                trait_class for trait_class in trait_candidates
+                if re.match(
+                    rf"{trait_id}.v(\d+)$", str(trait_class.id))
+            ]
+            if trait_versions:
+                def _get_version_by_id(trait_klass: Type[T]) -> int:
+                    match = re.search(r"v(\d+)$", str(trait_klass.id))
+                    return int(match[1]) if match else 0
+
+                error: LooseMatchingTraitError = LooseMatchingTraitError(
+                    "Found trait that might match.")
+                error.found_trait = max(
+                    trait_versions, key=_get_version_by_id)
+                error.expected_id = trait_id
+                raise error
+
+        return None
+
+    @classmethod
+    def get_trait_class_by_trait_id(cls, trait_id: str) -> Type[T]:
+        """Get the trait class for the given trait ID.
+
+        Args:
+            trait_id (str): Trait ID.
+
+        Returns:
+            type[TraitBase]: Trait class.
+
+        Raises:
+            IncompatibleTraitVersionError: If the trait version is incompatible
+                with the current version of the trait.
+
+        """
+        try:
+            trait_class = cls._get_trait_class(trait_id=trait_id)
+        except LooseMatchingTraitError as e:
+            requested_version = _get_version_from_id(trait_id)
+            found_version = _get_version_from_id(e.found_trait.id)
+            if found_version is None and not requested_version:
+                msg = (
+                    "Trait found with no version and requested version "
+                    "is not specified."
+                )
+                raise IncompatibleTraitVersionError(msg) from e
+
+            if found_version is None:
+                msg = (
+                    f"Trait {e.found_trait.id} found with no version, "
+                    "but requested version is specified."
+                )
+                raise IncompatibleTraitVersionError(msg) from e
+
+            if requested_version is None:
+                trait_class = e.found_trait
+                requested_version = found_version
+
+            if requested_version > found_version:
+                error_msg = (
+                    f"Requested trait version {requested_version} is "
+                    f"higher than the found trait version {found_version}."
+                )
+                raise IncompatibleTraitVersionError(error_msg) from e
+
+            if requested_version < found_version and hasattr(
+                    e.found_trait, "upgrade"):
+                error_msg = (
+                    "Requested trait version "
+                    f"{requested_version} is lower "
+                    f"than the found trait version {found_version}."
+                )
+                error: UpgradableTraitError = UpgradableTraitError(error_msg)
+                error.trait = e.found_trait
+                raise error from e
+        return trait_class  # type: ignore[return-value]
+
+    @classmethod
+    def from_dict(
+            cls: Type[Representation],
+            name: str,
+            representation_id: Optional[str] = None,
+            trait_data: Optional[dict] = None) -> Representation:
+        """Create a representation from a dictionary.
+
+        Args:
+            name (str): Representation name.
+            representation_id (str, optional): Representation ID.
+            trait_data (dict): Representation data. Dictionary with keys
+                as trait ids and values as trait data. Example::
+
+                    {
+                        "ayon.2d.PixelBased.v1": {
+                            "display_window_width": 1920,
+                            "display_window_height": 1080
+                        },
+                        "ayon.2d.Planar.v1": {
+                            "channels": 3
+                        }
+                    }
+
+        Returns:
+            Representation: Representation instance.
+
+        Raises:
+            ValueError: If the trait model with ID is not found.
+            TypeError: If the trait data is not a dictionary.
+            IncompatibleTraitVersionError: If the trait version is incompatible
+
+        """
+        if not trait_data:
+            trait_data = {}
+        traits = []
+        for trait_id, value in trait_data.items():
+            if not isinstance(value, dict):
+                msg = (
+                    f"Invalid trait data for trait ID {trait_id}. "
+                    "Trait data must be a dictionary."
+                )
+                raise TypeError(msg)
+
+            try:
+                trait_class = cls.get_trait_class_by_trait_id(trait_id)
+            except UpgradableTraitError as e:
+                # we found a newer version of trait, we will upgrade the data
+                if hasattr(e.trait, "upgrade"):
+                    traits.append(e.trait.upgrade(value))
+                else:
+                    msg = (
+                        f"Newer version of trait {e.trait.id} found "
+                        f"for requested {trait_id} but without "
+                        "upgrade method."
+                    )
+                    raise IncompatibleTraitVersionError(msg) from e
+            else:
+                if not trait_class:
+                    error_msg = f"Trait model with ID {trait_id} not found."
+                    raise ValueError(error_msg)
+
+                traits.append(trait_class(**value))
+
+        return cls(
+            name=name, representation_id=representation_id, traits=traits)
+
+    def validate(self) -> None:
+        """Validate the representation.
+
+        This method will validate all the traits in the representation.
+
+        Raises:
+            TraitValidationError: If the trait is invalid within representation
+
+        """
+        errors = []
+        for trait in self._data.values():
+            # we do this in the loop to catch all the errors
+            try:
+                trait.validate_trait(self)
+            except TraitValidationError as e:  # noqa: PERF203
+                errors.append(str(e))
+        if errors:
+            msg = "\n".join(errors)
+            scope = self.name
+            raise TraitValidationError(scope, msg)

client/ayon_core/pipeline/traits/temporal.py

@@ -0,0 +1,457 @@
+"""Temporal (time related) traits."""
+from __future__ import annotations
+
+import contextlib
+import re
+from dataclasses import dataclass
+from enum import Enum, auto
+from re import Pattern
+from typing import TYPE_CHECKING, ClassVar, Optional
+
+import clique
+
+from .trait import MissingTraitError, TraitBase, TraitValidationError
+
+if TYPE_CHECKING:
+
+    from .content import FileLocations
+    from .representation import Representation
+
+
+class GapPolicy(Enum):
+    """Gap policy enumeration.
+
+    This type defines how to handle gaps in a sequence.
+
+    Attributes:
+        forbidden (int): Gaps are forbidden.
+        missing (int): Gaps are interpreted as missing frames.
+        hold (int): Gaps are interpreted as hold frames (last existing frames).
+        black (int): Gaps are interpreted as black frames.
+    """
+
+    forbidden = auto()
+    missing = auto()
+    hold = auto()
+    black = auto()
+
+
+@dataclass
+class FrameRanged(TraitBase):
+    """Frame ranged trait model.
+
+    Model representing a frame-ranged trait.
+
+    Sync with OpenAssetIO MediaCreation Traits. For compatibility with
+    OpenAssetIO, we'll need to handle different names of attributes:
+
+        * frame_start -> start_frame
+        * frame_end -> end_frame
+        ...
+
+    Note: frames_per_second is a string to allow various precision
+        formats. FPS is a floating point number, but it can be also
+        represented as a fraction (e.g. "30000/1001") or as a decimal
+        or even as an irrational number. We need to support all these
+        formats. To work with FPS, we'll need some helper function
+        to convert FPS to Decimal from string.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with a version
+        frame_start (int): Frame start.
+        frame_end (int): Frame end.
+        frame_in (int): Frame in.
+        frame_out (int): Frame out.
+        frames_per_second (str): Frames per second.
+        step (int): Step.
+    """
+
+    name: ClassVar[str] = "FrameRanged"
+    description: ClassVar[str] = "Frame Ranged Trait"
+    id: ClassVar[str] = "ayon.time.FrameRanged.v1"
+    persistent: ClassVar[bool] = True
+    frame_start: int
+    frame_end: int
+    frame_in: Optional[int] = None
+    frame_out: Optional[int] = None
+    frames_per_second: str = None
+    step: Optional[int] = None
+
+
+@dataclass
+class Handles(TraitBase):
+    """Handles trait model.
+
+    Handles define the range of frames that are included or excluded
+    from the sequence.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with a version
+        inclusive (bool): Handles are inclusive.
+        frame_start_handle (int): Frame start handle.
+        frame_end_handle (int): Frame end handle.
+    """
+
+    name: ClassVar[str] = "Handles"
+    description: ClassVar[str] = "Handles Trait"
+    id: ClassVar[str] = "ayon.time.Handles.v1"
+    persistent: ClassVar[bool] = True
+    inclusive: Optional[bool] = False
+    frame_start_handle: Optional[int] = None
+    frame_end_handle: Optional[int] = None
+
+
+@dataclass
+class Sequence(TraitBase):
+    """Sequence trait model.
+
+    This model represents a sequence trait. Based on the FrameRanged trait
+    and Handles, adding support for gaps policy, frame padding and frame
+    list specification. Regex is used to match frame numbers.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with a version
+        gaps_policy (GapPolicy): Gaps policy - how to handle gaps in
+            sequence.
+        frame_padding (int): Frame padding.
+        frame_regex (str): Frame regex - regular expression to match
+            frame numbers. Must include 'index' named group and 'padding'
+            named group.
+        frame_spec (str): Frame list specification of frames. This takes
+            string like "1-10,20-30,40-50" etc.
+    """
+
+    name: ClassVar[str] = "Sequence"
+    description: ClassVar[str] = "Sequence Trait Model"
+    id: ClassVar[str] = "ayon.time.Sequence.v1"
+    persistent: ClassVar[bool] = True
+    frame_padding: int
+    gaps_policy: Optional[GapPolicy] = GapPolicy.forbidden
+    frame_regex: Optional[Pattern] = None
+    frame_spec: Optional[str] = None
+
+    @classmethod
+    def validate_frame_regex(
+        cls, v: Optional[Pattern]
+    ) -> Optional[Pattern]:
+        """Validate frame regex.
+
+        Frame regex must have index and padding named groups.
+
+        Returns:
+            Optional[Pattern]: Compiled regex pattern.
+
+        Raises:
+            ValueError: If frame regex does not include 'index' and 'padding'
+
+        """
+        if v is None:
+            return v
+        if v and any(s not in v.pattern for s in ["?P<index>", "?P<padding>"]):
+            msg = "Frame regex must include 'index' and `padding named groups"
+            raise ValueError(msg)
+        return v
+
+    def validate_trait(self, representation: Representation) -> None:
+        """Validate the trait."""
+        super().validate_trait(representation)
+
+        # if there is a FileLocations trait, run validation
+        # on it as well
+
+        with contextlib.suppress(MissingTraitError):
+            self._validate_file_locations(representation)
+
+    def _validate_file_locations(self, representation: Representation) -> None:
+        """Validate file locations trait.
+
+        If along with the Sequence trait, there is a FileLocations trait,
+        then we need to validate if the file locations match the frame
+        list specification.
+
+        Args:
+            representation (Representation): Representation instance.
+
+        """
+        from .content import FileLocations
+        file_locs: FileLocations = representation.get_trait(
+            FileLocations)
+        # Validate if the file locations on representation
+        # match the frame list (if any).
+        # We need to extend the expected frames with Handles.
+        frame_start = None
+        frame_end = None
+        handles_frame_start = None
+        handles_frame_end = None
+        with contextlib.suppress(MissingTraitError):
+            handles: Handles = representation.get_trait(Handles)
+            # if handles are inclusive, they should be already
+            #  accounted for in the FrameRaged frame spec
+            if not handles.inclusive:
+                handles_frame_start = handles.frame_start_handle
+                handles_frame_end = handles.frame_end_handle
+        with contextlib.suppress(MissingTraitError):
+            frame_ranged: FrameRanged = representation.get_trait(
+                FrameRanged)
+            frame_start = frame_ranged.frame_start
+            frame_end = frame_ranged.frame_end
+        if self.frame_spec is not None:
+            self.validate_frame_list(
+                file_locs,
+                frame_start,
+                frame_end,
+                handles_frame_start,
+                handles_frame_end)
+
+        self.validate_frame_padding(file_locs)
+
+    def validate_frame_list(
+            self,
+            file_locations: FileLocations,
+            frame_start: Optional[int] = None,
+            frame_end: Optional[int] = None,
+            handles_frame_start: Optional[int] = None,
+            handles_frame_end: Optional[int] = None) -> None:
+        """Validate a frame list.
+
+        This will take FileLocations trait and validate if the
+        file locations match the frame list specification.
+
+        For example, if the frame list is "1-10,20-30,40-50", then
+        the frame numbers in the file locations should match
+        these frames.
+
+        It will skip the validation if the frame list is not provided.
+
+        Args:
+            file_locations (FileLocations): File locations trait.
+            frame_start (Optional[int]): Frame start.
+            frame_end (Optional[int]): Frame end.
+            handles_frame_start (Optional[int]): Frame start handle.
+            handles_frame_end (Optional[int]): Frame end handle.
+
+        Raises:
+            TraitValidationError: If the frame list does not match
+                the expected frames.
+
+        """
+        if self.frame_spec is None:
+            return
+
+        frames: list[int] = []
+        if self.frame_regex:
+            frames = self.get_frame_list(
+                    file_locations, self.frame_regex)
+        else:
+            frames = self.get_frame_list(
+                    file_locations)
+
+        expected_frames = self.list_spec_to_frames(self.frame_spec)
+        if frame_start is None or frame_end is None:
+            if min(expected_frames) != frame_start:
+                msg = (
+                    "Frame start does not match the expected frame start. "
+                    f"Expected: {frame_start}, Found: {min(expected_frames)}"
+                )
+                raise TraitValidationError(self.name, msg)
+
+            if max(expected_frames) != frame_end:
+                msg = (
+                    "Frame end does not match the expected frame end. "
+                    f"Expected: {frame_end}, Found: {max(expected_frames)}"
+                )
+                raise TraitValidationError(self.name, msg)
+
+        # we need to extend the expected frames with Handles
+        if handles_frame_start is not None:
+            expected_frames.extend(
+                range(
+                    min(frames) - handles_frame_start, min(frames) + 1))
+
+        if handles_frame_end is not None:
+            expected_frames.extend(
+                range(
+                    max(frames), max(frames) + handles_frame_end + 1))
+
+        if set(frames) != set(expected_frames):
+            msg = (
+                "Frame list does not match the expected frames. "
+                f"Expected: {expected_frames}, Found: {frames}"
+            )
+            raise TraitValidationError(self.name, msg)
+
+    def validate_frame_padding(
+            self, file_locations: FileLocations) -> None:
+        """Validate frame padding.
+
+        This will take FileLocations trait and validate if the
+        frame padding matches the expected frame padding.
+
+        Args:
+            file_locations (FileLocations): File locations trait.
+
+        Raises:
+            TraitValidationError: If frame padding does not match
+                the expected frame padding.
+
+        """
+        expected_padding = self.get_frame_padding(file_locations)
+        if self.frame_padding != expected_padding:
+            msg = (
+                "Frame padding does not match the expected frame padding. "
+                f"Expected: {expected_padding}, Found: {self.frame_padding}"
+            )
+            raise TraitValidationError(self.name, msg)
+
+    @staticmethod
+    def list_spec_to_frames(list_spec: str) -> list[int]:
+        """Convert list specification to frames.
+
+        Returns:
+            list[int]: List of frame numbers.
+
+        Raises:
+            ValueError: If invalid frame number in the list.
+
+        """
+        frames = []
+        segments = list_spec.split(",")
+        for segment in segments:
+            ranges = segment.split("-")
+            if len(ranges) == 1:
+                if not ranges[0].isdigit():
+                    msg = (
+                        "Invalid frame number "
+                        f"in the list: {ranges[0]}"
+                    )
+                    raise ValueError(msg)
+                frames.append(int(ranges[0]))
+                continue
+            start, end = segment.split("-")
+            frames.extend(range(int(start), int(end) + 1))
+        return frames
+
+    @staticmethod
+    def _get_collection(
+        file_locations: FileLocations,
+        regex: Optional[Pattern] = None) -> clique.Collection:
+        r"""Get the collection from file locations.
+
+        Args:
+            file_locations (FileLocations): File locations trait.
+            regex (Optional[Pattern]): Regular expression to match
+                frame numbers. This is passed to ``clique.assemble()``.
+                Default clique pattern is::
+
+                    \.(?P<index>(?P<padding>0*)\d+)\.\D+\d?$
+
+        Returns:
+            clique.Collection: Collection instance.
+
+        Raises:
+            ValueError: If zero or multiple of collections are found.
+
+        """
+        patterns = [regex] if regex else None
+        files: list[str] = [
+            file.file_path.as_posix()
+            for file in file_locations.file_paths
+        ]
+        src_collections, _ = clique.assemble(files, patterns=patterns)
+        if len(src_collections) != 1:
+            msg = (
+                f"Zero or multiple collections found: {len(src_collections)} "
+                "expected 1"
+            )
+            raise ValueError(msg)
+        return src_collections[0]
+
+    @staticmethod
+    def get_frame_padding(file_locations: FileLocations) -> int:
+        """Get frame padding.
+
+        Returns:
+            int: Frame padding.
+
+        """
+        src_collection = Sequence._get_collection(file_locations)
+        padding = src_collection.padding
+        # sometimes Clique doesn't get the padding right, so
+        # we need to calculate it manually
+        if padding == 0:
+            padding = len(str(max(src_collection.indexes)))
+
+        return padding
+
+    @staticmethod
+    def get_frame_list(
+            file_locations: FileLocations,
+            regex: Optional[Pattern] = None,
+        ) -> list[int]:
+        r"""Get the frame list.
+
+        Args:
+            file_locations (FileLocations): File locations trait.
+            regex (Optional[Pattern]): Regular expression to match
+                frame numbers. This is passed to ``clique.assemble()``.
+                Default clique pattern is::
+
+                    \.(?P<index>(?P<padding>0*)\d+)\.\D+\d?$
+
+        Returns:
+            list[int]: List of frame numbers.
+
+        """
+        src_collection = Sequence._get_collection(file_locations, regex)
+        return list(src_collection.indexes)
+
+    def get_frame_pattern(self) -> Pattern:
+        """Get frame regex as a pattern.
+
+        If the regex is a string, it will compile it to the pattern.
+
+        Returns:
+            Pattern: Compiled regex pattern.
+
+        """
+        if self.frame_regex:
+            if isinstance(self.frame_regex, str):
+                return re.compile(self.frame_regex)
+            return self.frame_regex
+        return re.compile(
+            r"\.(?P<index>(?P<padding>0*)\d+)\.\D+\d?$")
+
+
+# Do we need one for drop and non-drop frame?
+@dataclass
+class SMPTETimecode(TraitBase):
+    """SMPTE Timecode trait model.
+
+    Attributes:
+        timecode (str): SMPTE Timecode HH:MM:SS:FF
+    """
+
+    name: ClassVar[str] = "Timecode"
+    description: ClassVar[str] = "SMPTE Timecode Trait"
+    id: ClassVar[str] = "ayon.time.SMPTETimecode.v1"
+    persistent: ClassVar[bool] = True
+    timecode: str
+
+
+@dataclass
+class Static(TraitBase):
+    """Static time trait.
+
+    Used to define static time (single frame).
+    """
+
+    name: ClassVar[str] = "Static"
+    description: ClassVar[str] = "Static Time Trait"
+    id: ClassVar[str] = "ayon.time.Static.v1"
+    persistent: ClassVar[bool] = True

client/ayon_core/pipeline/traits/three_dimensional.py

@@ -0,0 +1,93 @@
+"""3D traits."""
+from dataclasses import dataclass
+from typing import ClassVar
+
+from .trait import TraitBase
+
+
+@dataclass
+class Spatial(TraitBase):
+    """Spatial trait model.
+
+    Trait describing spatial information. Up axis valid strings are
+    "Y", "Z", "X". Handedness valid strings are "left", "right". Meters per
+    unit is a float value.
+
+    Example::
+
+            Spatial(up_axis="Y", handedness="right", meters_per_unit=1.0)
+
+    Todo:
+        * Add value validation for up_axis and handedness.
+
+    Attributes:
+        up_axis (str): Up axis.
+        handedness (str): Handedness.
+        meters_per_unit (float): Meters per unit.
+    """
+
+    id: ClassVar[str] = "ayon.3d.Spatial.v1"
+    name: ClassVar[str] = "Spatial"
+    description: ClassVar[str] = "Spatial trait model."
+    persistent: ClassVar[bool] = True
+    up_axis: str
+    handedness: str
+    meters_per_unit: float
+
+
+@dataclass
+class Geometry(TraitBase):
+    """Geometry type trait model.
+
+    Type trait for geometry data.
+
+    Sync with OpenAssetIO MediaCreation Traits.
+    """
+
+    id: ClassVar[str] = "ayon.3d.Geometry.v1"
+    name: ClassVar[str] = "Geometry"
+    description: ClassVar[str] = "Geometry trait model."
+    persistent: ClassVar[bool] = True
+
+
+@dataclass
+class Shader(TraitBase):
+    """Shader trait model.
+
+    Type trait for shader data.
+
+    Sync with OpenAssetIO MediaCreation Traits.
+    """
+
+    id: ClassVar[str] = "ayon.3d.Shader.v1"
+    name: ClassVar[str] = "Shader"
+    description: ClassVar[str] = "Shader trait model."
+    persistent: ClassVar[bool] = True
+
+
+@dataclass
+class Lighting(TraitBase):
+    """Lighting trait model.
+
+    Type trait for lighting data.
+
+    Sync with OpenAssetIO MediaCreation Traits.
+    """
+
+    id: ClassVar[str] = "ayon.3d.Lighting.v1"
+    name: ClassVar[str] = "Lighting"
+    description: ClassVar[str] = "Lighting trait model."
+    persistent: ClassVar[bool] = True
+
+
+@dataclass
+class IESProfile(TraitBase):
+    """IES profile (IES-LM-64) type trait model.
+
+    Sync with OpenAssetIO MediaCreation Traits.
+    """
+
+    id: ClassVar[str] = "ayon.3d.IESProfile.v1"
+    name: ClassVar[str] = "IESProfile"
+    description: ClassVar[str] = "IES profile trait model."
+    persistent: ClassVar[bool] = True

client/ayon_core/pipeline/traits/trait.py

@@ -0,0 +1,147 @@
+"""Defines the base trait model and representation."""
+from __future__ import annotations
+
+import re
+from abc import ABC, abstractmethod
+from dataclasses import asdict, dataclass
+from typing import TYPE_CHECKING, Generic, Optional, TypeVar
+
+if TYPE_CHECKING:
+    from .representation import Representation
+
+
+T = TypeVar("T", bound="TraitBase")
+
+
+@dataclass
+class TraitBase(ABC):
+    """Base trait model.
+
+    This model must be used as a base for all trait models.
+    ``id``, ``name``, and ``description`` are abstract attributes that must be
+    implemented in the derived classes.
+    """
+
+    @property
+    @abstractmethod
+    def id(self) -> str:
+        """Abstract attribute for ID."""
+        ...
+
+    @property
+    @abstractmethod
+    def name(self) -> str:
+        """Abstract attribute for name."""
+        ...
+
+    @property
+    @abstractmethod
+    def description(self) -> str:
+        """Abstract attribute for description."""
+        ...
+
+    def validate_trait(self, representation: Representation) -> None:  # noqa: PLR6301
+        """Validate the trait.
+
+        This method should be implemented in the derived classes to validate
+        the trait data. It can be used by traits to validate against other
+        traits in the representation.
+
+        Args:
+            representation (Representation): Representation instance.
+
+        """
+        return
+
+    @classmethod
+    def get_version(cls) -> Optional[int]:
+        # sourcery skip: use-named-expression
+        """Get a trait version from ID.
+
+        This assumes Trait ID ends with `.v{version}`. If not, it will
+        return None.
+
+        Returns:
+            Optional[int]: Trait version
+
+        """
+        version_regex = r"v(\d+)$"
+        match = re.search(version_regex, str(cls.id))
+        return int(match[1]) if match else None
+
+    @classmethod
+    def get_versionless_id(cls) -> str:
+        """Get a trait ID without a version.
+
+        Returns:
+            str: Trait ID without a version.
+
+        """
+        return re.sub(r"\.v\d+$", "", str(cls.id))
+
+    def as_dict(self) -> dict:
+        """Return a trait as a dictionary.
+
+        Returns:
+            dict: Trait as dictionary.
+
+        """
+        return asdict(self)
+
+
+class IncompatibleTraitVersionError(Exception):
+    """Incompatible trait version exception.
+
+    This exception is raised when the trait version is incompatible with the
+    current version of the trait.
+    """
+
+
+class UpgradableTraitError(Exception, Generic[T]):
+    """Upgradable trait version exception.
+
+    This exception is raised when the trait can upgrade existing data
+    meant for older versions of the trait. It must implement an `upgrade`
+    method that will take old trait data as an argument to handle the upgrade.
+    """
+
+    trait: T
+    old_data: dict
+
+
+class LooseMatchingTraitError(Exception, Generic[T]):
+    """Loose matching trait exception.
+
+    This exception is raised when the trait is found with a loose matching
+    criteria.
+    """
+
+    found_trait: T
+    expected_id: str
+
+
+class TraitValidationError(Exception):
+    """Trait validation error exception.
+
+    This exception is raised when the trait validation fails.
+    """
+
+    def __init__(self, scope: str, message: str):
+        """Initialize the exception.
+
+        We could determine the scope from the stack in the future,
+        provided the scope is always Trait name.
+
+        Args:
+            scope (str): Scope of the error.
+            message (str): Error message.
+
+        """
+        super().__init__(f"{scope}: {message}")
+
+
+class MissingTraitError(TypeError):
+    """Missing trait error exception.
+
+    This exception is raised when the trait is missing.
+    """

client/ayon_core/pipeline/traits/two_dimensional.py

@@ -0,0 +1,208 @@
+"""Two-dimensional image traits."""
+from __future__ import annotations
+
+import re
+from dataclasses import dataclass
+from typing import TYPE_CHECKING, ClassVar, Optional
+
+from .trait import TraitBase
+
+if TYPE_CHECKING:
+    from .content import FileLocation, FileLocations
+
+
+@dataclass
+class Image(TraitBase):
+    """Image trait model.
+
+    Type trait model for image.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with version
+    """
+
+    name: ClassVar[str] = "Image"
+    description: ClassVar[str] = "Image Trait"
+    id: ClassVar[str] = "ayon.2d.Image.v1"
+    persistent: ClassVar[bool] = True
+
+
+@dataclass
+class PixelBased(TraitBase):
+    """PixelBased trait model.
+
+    The pixel-related trait for image data.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with a version
+        display_window_width (int): Width of the image display window.
+        display_window_height (int): Height of the image display window.
+        pixel_aspect_ratio (float): Pixel aspect ratio.
+    """
+
+    name: ClassVar[str] = "PixelBased"
+    description: ClassVar[str] = "PixelBased Trait Model"
+    id: ClassVar[str] = "ayon.2d.PixelBased.v1"
+    persistent: ClassVar[bool] = True
+    display_window_width: int
+    display_window_height: int
+    pixel_aspect_ratio: float
+
+
+@dataclass
+class Planar(TraitBase):
+    """Planar trait model.
+
+    This model represents an Image with planar configuration.
+
+    Todo:
+        * (antirotor): Is this really a planar configuration? As with
+            bit planes and everything? If it serves as differentiator for
+            Deep images, should it be named differently? Like Raster?
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be namespaced trait name with version
+        planar_configuration (str): Planar configuration.
+    """
+
+    name: ClassVar[str] = "Planar"
+    description: ClassVar[str] = "Planar Trait Model"
+    id: ClassVar[str] = "ayon.2d.Planar.v1"
+    persistent: ClassVar[bool] = True
+    planar_configuration: str
+
+
+@dataclass
+class Deep(TraitBase):
+    """Deep trait model.
+
+    Type trait model for deep EXR images.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with a version
+    """
+
+    name: ClassVar[str] = "Deep"
+    description: ClassVar[str] = "Deep Trait Model"
+    id: ClassVar[str] = "ayon.2d.Deep.v1"
+    persistent: ClassVar[bool] = True
+
+
+@dataclass
+class Overscan(TraitBase):
+    """Overscan trait model.
+
+    This model represents an overscan (or underscan) trait. Defines the
+    extra pixels around the image.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be a namespaced trait name with a version
+        left (int): Left overscan/underscan.
+        right (int): Right overscan/underscan.
+        top (int): Top overscan/underscan.
+        bottom (int): Bottom overscan/underscan.
+    """
+
+    name: ClassVar[str] = "Overscan"
+    description: ClassVar[str] = "Overscan Trait"
+    id: ClassVar[str] = "ayon.2d.Overscan.v1"
+    persistent: ClassVar[bool] = True
+    left: int
+    right: int
+    top: int
+    bottom: int
+
+
+@dataclass
+class UDIM(TraitBase):
+    """UDIM trait model.
+
+    This model represents a UDIM trait.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be namespaced trait name with version
+        udim (int): UDIM value.
+        udim_regex (str): UDIM regex.
+    """
+
+    name: ClassVar[str] = "UDIM"
+    description: ClassVar[str] = "UDIM Trait"
+    id: ClassVar[str] = "ayon.2d.UDIM.v1"
+    persistent: ClassVar[bool] = True
+    udim: list[int]
+    udim_regex: Optional[str] = r"(?:\.|_)(?P<udim>\d+)\.\D+\d?$"
+
+    # Field validator for udim_regex - this works in the pydantic model v2
+    # but not with the pure data classes.
+    @classmethod
+    def validate_frame_regex(cls, v: Optional[str]) -> Optional[str]:
+        """Validate udim regex.
+
+        Returns:
+            Optional[str]: UDIM regex.
+
+        Raises:
+            ValueError: UDIM regex must include 'udim' named group.
+
+        """
+        if v is not None and "?P<udim>" not in v:
+            msg = "UDIM regex must include 'udim' named group"
+            raise ValueError(msg)
+        return v
+
+    def get_file_location_for_udim(
+            self,
+            file_locations: FileLocations,
+            udim: int,
+        ) -> Optional[FileLocation]:
+        """Get file location for UDIM.
+
+        Args:
+            file_locations (FileLocations): File locations.
+            udim (int): UDIM value.
+
+        Returns:
+            Optional[FileLocation]: File location.
+
+        """
+        if not self.udim_regex:
+            return None
+        pattern = re.compile(self.udim_regex)
+        for location in file_locations.file_paths:
+            result = re.search(pattern, location.file_path.name)
+            if result:
+                udim_index = int(result.group("udim"))
+                if udim_index == udim:
+                    return location
+        return None
+
+    def get_udim_from_file_location(
+            self, file_location: FileLocation) -> Optional[int]:
+        """Get UDIM from the file location.
+
+        Args:
+            file_location (FileLocation): File location.
+
+        Returns:
+            Optional[int]: UDIM value.
+
+        """
+        if not self.udim_regex:
+            return None
+        pattern = re.compile(self.udim_regex)
+        result = re.search(pattern, file_location.file_path.name)
+        if result:
+            return int(result.group("udim"))
+        return None

client/ayon_core/pipeline/traits/utils.py

@@ -0,0 +1,90 @@
+"""Utility functions for traits."""
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Optional
+
+from clique import assemble
+
+from ayon_core.addon import AddonsManager, ITraits
+from ayon_core.pipeline.traits.temporal import FrameRanged
+
+if TYPE_CHECKING:
+    from pathlib import Path
+    from ayon_core.pipeline.traits.trait import TraitBase
+
+
+def get_sequence_from_files(paths: list[Path]) -> FrameRanged:
+    """Get the original frame range from files.
+
+    Note that this cannot guess frame rate, so it's set to 25.
+    This will also fail on paths that cannot be assembled into
+    one collection without any reminders.
+
+    Args:
+        paths (list[Path]): List of file paths.
+
+    Returns:
+        FrameRanged: FrameRanged trait.
+
+    Raises:
+        ValueError: If paths cannot be assembled into one collection
+
+    """
+    cols, rems = assemble([path.as_posix() for path in paths])
+    if rems:
+        msg = "Cannot assemble paths into one collection"
+        raise ValueError(msg)
+    if len(cols) != 1:
+        msg = "More than one collection found"
+        raise ValueError(msg)
+    col = cols[0]
+
+    sorted_frames = sorted(col.indexes)
+    # First frame used for end value
+    first_frame = sorted_frames[0]
+    # Get last frame for padding
+    last_frame = sorted_frames[-1]
+    # Use padding from a collection of the last frame lengths as string
+    # padding = max(col.padding, len(str(last_frame)))
+
+    return FrameRanged(
+        frame_start=first_frame, frame_end=last_frame,
+        frames_per_second="25.0"
+    )
+
+
+def get_available_traits(
+        addons_manager: Optional[AddonsManager] = None
+) -> Optional[list[TraitBase]]:
+    """Get available traits from active addons.
+
+    Args:
+        addons_manager (Optional[AddonsManager]): Addons manager instance.
+            If not provided, a new one will be created. Within pyblish
+            plugins, you can use an already collected instance of
+            AddonsManager from context `context.data["ayonAddonsManager"]`.
+
+    Returns:
+        list[TraitBase]: List of available traits.
+
+    """
+    if addons_manager is None:
+        # Create a new instance of AddonsManager
+        addons_manager = AddonsManager()
+
+    # Get active addons
+    enabled_addons = addons_manager.get_enabled_addons()
+    traits = []
+    for addon in enabled_addons:
+        if not issubclass(type(addon), ITraits):
+            # Skip addons not providing traits
+            continue
+        # Get traits from addon
+        addon_traits = addon.get_addon_traits()
+        if addon_traits:
+            # Add traits to a list
+            for trait in addon_traits:
+                if trait not in traits:
+                    traits.append(trait)
+
+    return traits

client/ayon_core/pipeline/workfile/workfile_template_builder.py

@@ -8,7 +8,7 @@ targeted by task types and names.
 
 Placeholders are created using placeholder plugins which should care about
 logic and data of placeholder items. 'PlaceholderItem' is used to keep track
-about it's progress.
+about its progress.
 """
 
 import os
@@ -17,6 +17,7 @@ import collections
 import copy
 from abc import ABC, abstractmethod
 
+import ayon_api
 from ayon_api import (
     get_folders,
     get_folder_by_path,
@@ -60,6 +61,32 @@ from ayon_core.pipeline.create import (
 _NOT_SET = object()
 
 
+class EntityResolutionError(Exception):
+    """Exception raised when entity URI resolution fails."""
+
+
+def resolve_entity_uri(entity_uri: str) -> str:
+    """Resolve AYON entity URI to a filesystem path for local system."""
+    response = ayon_api.post(
+        "resolve",
+        resolveRoots=True,
+        uris=[entity_uri]
+    )
+    if response.status_code != 200:
+        raise RuntimeError(
+            f"Unable to resolve AYON entity URI filepath for "
+            f"'{entity_uri}': {response.text}"
+        )
+
+    entities = response.data[0]["entities"]
+    if len(entities) != 1:
+        raise EntityResolutionError(
+            f"Unable to resolve AYON entity URI '{entity_uri}' to a "
+            f"single filepath. Received data: {response.data}"
+        )
+    return entities[0]["filePath"]
+
+
 class TemplateNotFound(Exception):
     """Exception raised when template does not exist."""
     pass
@@ -823,7 +850,6 @@ class AbstractTemplateBuilder(ABC):
         """
 
         host_name = self.host_name
-        project_name = self.project_name
         task_name = self.current_task_name
         task_type = self.current_task_type
 
@@ -835,7 +861,6 @@ class AbstractTemplateBuilder(ABC):
                 "task_names": task_name
             }
         )
-
         if not profile:
             raise TemplateProfileNotFound((
                 "No matching profile found for task '{}' of type '{}' "
@@ -843,6 +868,22 @@ class AbstractTemplateBuilder(ABC):
             ).format(task_name, task_type, host_name))
 
         path = profile["path"]
+        if not path:
+            raise TemplateLoadFailed((
+                "Template path is not set.\n"
+                "Path need to be set in {}\\Template Workfile Build "
+                "Settings\\Profiles"
+            ).format(host_name.title()))
+
+        resolved_path = self.resolve_template_path(path)
+        if not resolved_path or not os.path.exists(resolved_path):
+            raise TemplateNotFound(
+                "Template file found in AYON settings for task '{}' with host "
+                "'{}' does not exists. (Not found : {})".format(
+                    task_name, host_name, resolved_path)
+            )
+
+        self.log.info(f"Found template at: '{resolved_path}'")
 
         # switch to remove placeholders after they are used
         keep_placeholder = profile.get("keep_placeholder")
@@ -852,44 +893,86 @@ class AbstractTemplateBuilder(ABC):
         if keep_placeholder is None:
             keep_placeholder = True
 
-        if not path:
-            raise TemplateLoadFailed((
-                "Template path is not set.\n"
-                "Path need to be set in {}\\Template Workfile Build "
-                "Settings\\Profiles"
-            ).format(host_name.title()))
-
-        # Try to fill path with environments and anatomy roots
-        anatomy = Anatomy(project_name)
-        fill_data = {
-            key: value
-            for key, value in os.environ.items()
+        return {
+            "path": resolved_path,
+            "keep_placeholder": keep_placeholder,
+            "create_first_version": create_first_version
         }
 
-        fill_data["root"] = anatomy.roots
-        fill_data["project"] = {
-            "name": project_name,
-            "code": anatomy.project_code,
-        }
+    def resolve_template_path(self, path, fill_data=None) -> str:
+        """Resolve the template path.
 
-        path = self.resolve_template_path(path, fill_data)
+        By default, this:
+          - Resolves AYON entity URI to a filesystem path
+          - Returns path directly if it exists on disk.
+          - Resolves template keys through anatomy and environment variables.
 
+        This can be overridden in host integrations to perform additional
+        resolving over the template. Like, `hou.text.expandString` in Houdini.
+        It's recommended to still call the super().resolve_template_path()
+        to ensure the basic resolving is done across all integrations.
+
+        Arguments:
+            path (str): The input path.
+            fill_data (dict[str, str]): Deprecated. This is computed inside
+                the method using the current environment and project settings.
+                Used to be the data to use for template formatting.
+
+        Returns:
+            str: The resolved path.
+
+        """
+
+        # If the path is an AYON entity URI, then resolve the filepath
+        # through the backend
+        if path.startswith("ayon+entity://") or path.startswith("ayon://"):
+            # This is a special case where the path is an AYON entity URI
+            # We need to resolve it to a filesystem path
+            resolved_path = resolve_entity_uri(path)
+            return resolved_path
+
+        # If the path is set and it's found on disk, return it directly
         if path and os.path.exists(path):
-            self.log.info("Found template at: '{}'".format(path))
-            return {
-                "path": path,
-                "keep_placeholder": keep_placeholder,
-                "create_first_version": create_first_version
+            return path
+
+        # We may have path for another platform, like C:/path/to/file
+        # or a path with template keys, like {project[code]} or both.
+        # Try to fill path with environments and anatomy roots
+        project_name = self.project_name
+        anatomy = Anatomy(project_name)
+
+        # Simple check whether the path contains any template keys
+        if "{" in path:
+            fill_data = {
+                key: value
+                for key, value in os.environ.items()
+            }
+            fill_data["root"] = anatomy.roots
+            fill_data["project"] = {
+                "name": project_name,
+                "code": anatomy.project_code,
             }
 
-        solved_path = None
+            # Format the template using local fill data
+            result = StringTemplate.format_template(path, fill_data)
+            if not result.solved:
+                return path
+
+            path = result.normalized()
+            if os.path.exists(path):
+                return path
+
+        # If the path were set in settings using a Windows path and we
+        # are now on a Linux system, we try to convert the solved path to
+        # the current platform.
         while True:
             try:
                 solved_path = anatomy.path_remapper(path)
             except KeyError as missing_key:
                 raise KeyError(
-                    "Could not solve key '{}' in template path '{}'".format(
-                        missing_key, path))
+                    f"Could not solve key '{missing_key}'"
+                    f" in template path '{path}'"
+                )
 
             if solved_path is None:
                 solved_path = path
@@ -898,40 +981,7 @@ class AbstractTemplateBuilder(ABC):
             path = solved_path
 
         solved_path = os.path.normpath(solved_path)
-        if not os.path.exists(solved_path):
-            raise TemplateNotFound(
-                "Template found in AYON settings for task '{}' with host "
-                "'{}' does not exists. (Not found : {})".format(
-                    task_name, host_name, solved_path))
-
-        self.log.info("Found template at: '{}'".format(solved_path))
-
-        return {
-            "path": solved_path,
-            "keep_placeholder": keep_placeholder,
-            "create_first_version": create_first_version
-        }
-
-    def resolve_template_path(self, path, fill_data) -> str:
-        """Resolve the template path.
-
-        By default, this does nothing except returning the path directly.
-
-        This can be overridden in host integrations to perform additional
-        resolving over the template. Like, `hou.text.expandString` in Houdini.
-
-        Arguments:
-            path (str): The input path.
-            fill_data (dict[str, str]): Data to use for template formatting.
-
-        Returns:
-            str: The resolved path.
-
-        """
-        result = StringTemplate.format_template(path, fill_data)
-        if result.solved:
-            path = result.normalized()
-        return path
+        return solved_path
 
     def emit_event(self, topic, data=None, source=None) -> Event:
         return self._event_system.emit(topic, data, source)

client/ayon_core/plugins/publish/extract_color_transcode.py

@@ -58,7 +58,7 @@ class ExtractOIIOTranscode(publish.Extractor):
     optional = True
 
     # Supported extensions
-    supported_exts = ["exr", "jpg", "jpeg", "png", "dpx"]
+    supported_exts = {"exr", "jpg", "jpeg", "png", "dpx"}
 
     # Configurable by Settings
     profiles = None

client/ayon_core/plugins/publish/extract_review.py

@@ -135,11 +135,11 @@ class ExtractReview(pyblish.api.InstancePlugin):
     ]
 
     # Supported extensions
-    image_exts = ["exr", "jpg", "jpeg", "png", "dpx", "tga", "tiff", "tif"]
-    video_exts = ["mov", "mp4"]
-    supported_exts = image_exts + video_exts
+    image_exts = {"exr", "jpg", "jpeg", "png", "dpx", "tga", "tiff", "tif"}
+    video_exts = {"mov", "mp4"}
+    supported_exts = image_exts | video_exts
 
-    alpha_exts = ["exr", "png", "dpx"]
+    alpha_exts = {"exr", "png", "dpx"}
 
     # Preset attributes
     profiles = []

client/ayon_core/tools/common_models/projects.py

@@ -1,6 +1,8 @@
+from __future__ import annotations
 import contextlib
 from abc import ABC, abstractmethod
 from typing import Dict, Any
+from dataclasses import dataclass
 
 import ayon_api
 
@@ -140,6 +142,7 @@ class TaskTypeItem:
         )
 
 
+@dataclass
 class ProjectItem:
     """Item representing folder entity on a server.
 
@@ -150,21 +153,14 @@ class ProjectItem:
         active (Union[str, None]): Parent folder id. If 'None' then project
             is parent.
     """
-
-    def __init__(self, name, active, is_library, icon=None):
-        self.name = name
-        self.active = active
-        self.is_library = is_library
-        if icon is None:
-            icon = {
-                "type": "awesome-font",
-                "name": "fa.book" if is_library else "fa.map",
-                "color": get_default_entity_icon_color(),
-            }
-        self.icon = icon
+    name: str
+    active: bool
+    is_library: bool
+    icon: dict[str, Any]
+    is_pinned: bool = False
 
     @classmethod
-    def from_entity(cls, project_entity):
+    def from_entity(cls, project_entity: dict[str, Any]) -> "ProjectItem":
         """Creates folder item from entity.
 
         Args:
@@ -174,10 +170,16 @@ class ProjectItem:
             ProjectItem: Project item.
 
         """
+        icon = {
+            "type": "awesome-font",
+            "name": "fa.book" if project_entity["library"] else "fa.map",
+            "color": get_default_entity_icon_color(),
+        }
         return cls(
             project_entity["name"],
             project_entity["active"],
             project_entity["library"],
+            icon
         )
 
     def to_data(self):
@@ -208,16 +210,18 @@ class ProjectItem:
         return cls(**data)
 
 
-def _get_project_items_from_entitiy(projects):
+def _get_project_items_from_entitiy(
+    projects: list[dict[str, Any]]
+) -> list[ProjectItem]:
     """
 
     Args:
         projects (list[dict[str, Any]]): List of projects.
 
     Returns:
-        ProjectItem: Project item.
-    """
+        list[ProjectItem]: Project item.
 
+    """
     return [
         ProjectItem.from_entity(project)
         for project in projects
@@ -428,9 +432,20 @@ class ProjectsModel(object):
             self._projects_cache.update_data(project_items)
         return self._projects_cache.get_data()
 
-    def _query_projects(self):
+    def _query_projects(self) -> list[ProjectItem]:
         projects = ayon_api.get_projects(fields=["name", "active", "library"])
-        return _get_project_items_from_entitiy(projects)
+        user = ayon_api.get_user()
+        pinned_projects = (
+            user
+            .get("data", {})
+            .get("frontendPreferences", {})
+            .get("pinnedProjects")
+        ) or []
+        pinned_projects = set(pinned_projects)
+        project_items = _get_project_items_from_entitiy(list(projects))
+        for project in project_items:
+            project.is_pinned = project.name in pinned_projects
+        return project_items
 
     def _status_items_getter(self, project_entity):
         if not project_entity:

client/ayon_core/tools/launcher/control.py

@@ -1,6 +1,6 @@
 from ayon_core.lib import Logger, get_ayon_username
 from ayon_core.lib.events import QueuedEventSystem
-from ayon_core.settings import get_project_settings
+from ayon_core.settings import get_project_settings, get_studio_settings
 from ayon_core.tools.common_models import ProjectsModel, HierarchyModel
 
 from .abstract import AbstractLauncherFrontEnd, AbstractLauncherBackend
@@ -85,7 +85,10 @@ class BaseLauncherController(
     def get_project_settings(self, project_name):
         if project_name in self._project_settings:
             return self._project_settings[project_name]
-        settings = get_project_settings(project_name)
+        if project_name:
+            settings = get_project_settings(project_name)
+        else:
+            settings = get_studio_settings()
         self._project_settings[project_name] = settings
         return settings
 

client/ayon_core/tools/launcher/ui/projects_widget.py

@@ -1,154 +0,0 @@
-from qtpy import QtWidgets, QtCore
-
-from ayon_core.tools.flickcharm import FlickCharm
-from ayon_core.tools.utils import (
-    PlaceholderLineEdit,
-    RefreshButton,
-    ProjectsQtModel,
-    ProjectSortFilterProxy,
-)
-from ayon_core.tools.common_models import PROJECTS_MODEL_SENDER
-
-
-class ProjectIconView(QtWidgets.QListView):
-    """Styled ListView that allows to toggle between icon and list mode.
-
-    Toggling between the two modes is done by Right Mouse Click.
-    """
-
-    IconMode = 0
-    ListMode = 1
-
-    def __init__(self, parent=None, mode=ListMode):
-        super(ProjectIconView, self).__init__(parent=parent)
-
-        # Workaround for scrolling being super slow or fast when
-        # toggling between the two visual modes
-        self.setVerticalScrollMode(QtWidgets.QAbstractItemView.ScrollPerPixel)
-        self.setObjectName("IconView")
-
-        self._mode = None
-        self.set_mode(mode)
-
-    def set_mode(self, mode):
-        if mode == self._mode:
-            return
-
-        self._mode = mode
-
-        if mode == self.IconMode:
-            self.setViewMode(QtWidgets.QListView.IconMode)
-            self.setResizeMode(QtWidgets.QListView.Adjust)
-            self.setWrapping(True)
-            self.setWordWrap(True)
-            self.setGridSize(QtCore.QSize(151, 90))
-            self.setIconSize(QtCore.QSize(50, 50))
-            self.setSpacing(0)
-            self.setAlternatingRowColors(False)
-
-            self.setProperty("mode", "icon")
-            self.style().polish(self)
-
-            self.verticalScrollBar().setSingleStep(30)
-
-        elif self.ListMode:
-            self.setProperty("mode", "list")
-            self.style().polish(self)
-
-            self.setViewMode(QtWidgets.QListView.ListMode)
-            self.setResizeMode(QtWidgets.QListView.Adjust)
-            self.setWrapping(False)
-            self.setWordWrap(False)
-            self.setIconSize(QtCore.QSize(20, 20))
-            self.setGridSize(QtCore.QSize(100, 25))
-            self.setSpacing(0)
-            self.setAlternatingRowColors(False)
-
-            self.verticalScrollBar().setSingleStep(34)
-
-    def mousePressEvent(self, event):
-        if event.button() == QtCore.Qt.RightButton:
-            self.set_mode(int(not self._mode))
-        return super(ProjectIconView, self).mousePressEvent(event)
-
-
-class ProjectsWidget(QtWidgets.QWidget):
-    """Projects Page"""
-
-    refreshed = QtCore.Signal()
-
-    def __init__(self, controller, parent=None):
-        super(ProjectsWidget, self).__init__(parent=parent)
-
-        header_widget = QtWidgets.QWidget(self)
-
-        projects_filter_text = PlaceholderLineEdit(header_widget)
-        projects_filter_text.setPlaceholderText("Filter projects...")
-
-        refresh_btn = RefreshButton(header_widget)
-
-        header_layout = QtWidgets.QHBoxLayout(header_widget)
-        header_layout.setContentsMargins(0, 0, 0, 0)
-        header_layout.addWidget(projects_filter_text, 1)
-        header_layout.addWidget(refresh_btn, 0)
-
-        projects_view = ProjectIconView(parent=self)
-        projects_view.setSelectionMode(QtWidgets.QListView.NoSelection)
-        flick = FlickCharm(parent=self)
-        flick.activateOn(projects_view)
-        projects_model = ProjectsQtModel(controller)
-        projects_proxy_model = ProjectSortFilterProxy()
-        projects_proxy_model.setSourceModel(projects_model)
-
-        projects_view.setModel(projects_proxy_model)
-
-        main_layout = QtWidgets.QVBoxLayout(self)
-        main_layout.setContentsMargins(0, 0, 0, 0)
-        main_layout.addWidget(header_widget, 0)
-        main_layout.addWidget(projects_view, 1)
-
-        projects_view.clicked.connect(self._on_view_clicked)
-        projects_model.refreshed.connect(self.refreshed)
-        projects_filter_text.textChanged.connect(
-            self._on_project_filter_change)
-        refresh_btn.clicked.connect(self._on_refresh_clicked)
-
-        controller.register_event_callback(
-            "projects.refresh.finished",
-            self._on_projects_refresh_finished
-        )
-
-        self._controller = controller
-
-        self._projects_view = projects_view
-        self._projects_model = projects_model
-        self._projects_proxy_model = projects_proxy_model
-
-    def has_content(self):
-        """Model has at least one project.
-
-        Returns:
-             bool: True if there is any content in the model.
-        """
-
-        return self._projects_model.has_content()
-
-    def _on_view_clicked(self, index):
-        if not index.isValid():
-            return
-        model = index.model()
-        flags = model.flags(index)
-        if not flags & QtCore.Qt.ItemIsEnabled:
-            return
-        project_name = index.data(QtCore.Qt.DisplayRole)
-        self._controller.set_selected_project(project_name)
-
-    def _on_project_filter_change(self, text):
-        self._projects_proxy_model.setFilterFixedString(text)
-
-    def _on_refresh_clicked(self):
-        self._controller.refresh()
-
-    def _on_projects_refresh_finished(self, event):
-        if event["sender"] != PROJECTS_MODEL_SENDER:
-            self._projects_model.refresh()

client/ayon_core/tools/launcher/ui/window.py

@@ -3,9 +3,13 @@ from qtpy import QtWidgets, QtCore, QtGui
 from ayon_core import style, resources
 
 from ayon_core.tools.launcher.control import BaseLauncherController
-from ayon_core.tools.utils import MessageOverlayObject
+from ayon_core.tools.utils import (
+    MessageOverlayObject,
+    PlaceholderLineEdit,
+    RefreshButton,
+    ProjectsWidget,
+)
 
-from .projects_widget import ProjectsWidget
 from .hierarchy_page import HierarchyPage
 from .actions_widget import ActionsWidget
 
@@ -50,7 +54,25 @@ class LauncherWindow(QtWidgets.QWidget):
         pages_widget = QtWidgets.QWidget(content_body)
 
         # - First page - Projects
-        projects_page = ProjectsWidget(controller, pages_widget)
+        projects_page = QtWidgets.QWidget(pages_widget)
+        projects_header_widget = QtWidgets.QWidget(projects_page)
+
+        projects_filter_text = PlaceholderLineEdit(projects_header_widget)
+        projects_filter_text.setPlaceholderText("Filter projects...")
+
+        refresh_btn = RefreshButton(projects_header_widget)
+
+        projects_header_layout = QtWidgets.QHBoxLayout(projects_header_widget)
+        projects_header_layout.setContentsMargins(0, 0, 0, 0)
+        projects_header_layout.addWidget(projects_filter_text, 1)
+        projects_header_layout.addWidget(refresh_btn, 0)
+
+        projects_widget = ProjectsWidget(controller, pages_widget)
+
+        projects_layout = QtWidgets.QVBoxLayout(projects_page)
+        projects_layout.setContentsMargins(0, 0, 0, 0)
+        projects_layout.addWidget(projects_header_widget, 0)
+        projects_layout.addWidget(projects_widget, 1)
 
         # - Second page - Hierarchy (folders & tasks)
         hierarchy_page = HierarchyPage(controller, pages_widget)
@@ -102,12 +124,16 @@ class LauncherWindow(QtWidgets.QWidget):
         page_slide_anim.setEndValue(1.0)
         page_slide_anim.setEasingCurve(QtCore.QEasingCurve.OutQuad)
 
-        projects_page.refreshed.connect(self._on_projects_refresh)
+        refresh_btn.clicked.connect(self._on_refresh_request)
+        projects_widget.refreshed.connect(self._on_projects_refresh)
+
         actions_refresh_timer.timeout.connect(
             self._on_actions_refresh_timeout)
         page_slide_anim.valueChanged.connect(
             self._on_page_slide_value_changed)
         page_slide_anim.finished.connect(self._on_page_slide_finished)
+        projects_filter_text.textChanged.connect(
+            self._on_project_filter_change)
 
         controller.register_event_callback(
             "selection.project.changed",
@@ -142,6 +168,7 @@ class LauncherWindow(QtWidgets.QWidget):
         self._pages_widget = pages_widget
         self._pages_layout = pages_layout
         self._projects_page = projects_page
+        self._projects_widget = projects_widget
         self._hierarchy_page = hierarchy_page
         self._actions_widget = actions_widget
         # self._action_history = action_history
@@ -194,6 +221,12 @@ class LauncherWindow(QtWidgets.QWidget):
         elif self._is_on_projects_page:
             self._go_to_hierarchy_page(project_name)
 
+    def _on_project_filter_change(self, text):
+        self._projects_widget.set_name_filter(text)
+
+    def _on_refresh_request(self):
+        self._controller.refresh()
+
     def _on_projects_refresh(self):
         # Refresh only actions on projects page
         if self._is_on_projects_page:
@@ -201,7 +234,7 @@ class LauncherWindow(QtWidgets.QWidget):
             return
 
         # No projects were found -> go back to projects page
-        if not self._projects_page.has_content():
+        if not self._projects_widget.has_content():
             self._go_to_projects_page()
             return
 
@@ -280,6 +313,9 @@ class LauncherWindow(QtWidgets.QWidget):
     def _go_to_projects_page(self):
         if self._is_on_projects_page:
             return
+
+        # Deselect project in projects widget
+        self._projects_widget.set_selected_project(None)
         self._is_on_projects_page = True
         self._hierarchy_page.set_page_visible(False)
 

client/ayon_core/tools/utils/__init__.py

@@ -29,6 +29,7 @@ from .widgets import (
 from .views import (
     DeselectableTreeView,
     TreeView,
+    ListView,
 )
 from .error_dialog import ErrorMessageBox
 from .lib import (
@@ -61,6 +62,7 @@ from .dialogs import (
 )
 from .projects_widget import (
     ProjectsCombobox,
+    ProjectsWidget,
     ProjectsQtModel,
     ProjectSortFilterProxy,
     PROJECT_NAME_ROLE,
@@ -114,6 +116,7 @@ __all__ = (
 
     "DeselectableTreeView",
     "TreeView",
+    "ListView",
 
     "ErrorMessageBox",
 
@@ -145,6 +148,7 @@ __all__ = (
     "PopupUpdateKeys",
 
     "ProjectsCombobox",
+    "ProjectsWidget",
     "ProjectsQtModel",
     "ProjectSortFilterProxy",
     "PROJECT_NAME_ROLE",

client/ayon_core/tools/utils/projects_widget.py

@@ -1,21 +1,69 @@
+from __future__ import annotations
+from abc import ABC, abstractmethod
+from collections.abc import Callable
+import typing
+from typing import Optional
+
 from qtpy import QtWidgets, QtCore, QtGui
 
-from ayon_core.tools.common_models import PROJECTS_MODEL_SENDER
+from ayon_core.tools.common_models import (
+    ProjectItem,
+    PROJECTS_MODEL_SENDER,
+)
 
+from .views import ListView
 from .lib import RefreshThread, get_qt_icon
 
+if typing.TYPE_CHECKING:
+    from typing import TypedDict
+
+    class ExpectedProjectSelectionData(TypedDict):
+        name: Optional[str]
+        current: Optional[str]
+        selected: Optional[str]
+
+    class ExpectedSelectionData(TypedDict):
+        project: ExpectedProjectSelectionData
+
+
 PROJECT_NAME_ROLE = QtCore.Qt.UserRole + 1
 PROJECT_IS_ACTIVE_ROLE = QtCore.Qt.UserRole + 2
 PROJECT_IS_LIBRARY_ROLE = QtCore.Qt.UserRole + 3
 PROJECT_IS_CURRENT_ROLE = QtCore.Qt.UserRole + 4
-LIBRARY_PROJECT_SEPARATOR_ROLE = QtCore.Qt.UserRole + 5
+PROJECT_IS_PINNED_ROLE = QtCore.Qt.UserRole + 5
+LIBRARY_PROJECT_SEPARATOR_ROLE = QtCore.Qt.UserRole + 6
+
+
+class AbstractProjectController(ABC):
+    @abstractmethod
+    def register_event_callback(self, topic: str, callback: Callable):
+        pass
+
+    @abstractmethod
+    def get_project_items(
+        self, sender: Optional[str] = None
+    ) -> list[str]:
+        pass
+
+    @abstractmethod
+    def set_selected_project(self, project_name: str):
+        pass
+
+    # These are required only if widget should handle expected selection
+    @abstractmethod
+    def expected_project_selected(self, project_name: str):
+        pass
+
+    @abstractmethod
+    def get_expected_selection_data(self) -> "ExpectedSelectionData":
+        pass
 
 
 class ProjectsQtModel(QtGui.QStandardItemModel):
     refreshed = QtCore.Signal()
 
-    def __init__(self, controller):
-        super(ProjectsQtModel, self).__init__()
+    def __init__(self, controller: AbstractProjectController):
+        super().__init__()
         self._controller = controller
 
         self._project_items = {}
@@ -213,7 +261,7 @@ class ProjectsQtModel(QtGui.QStandardItemModel):
         else:
             self.refreshed.emit()
 
-    def _fill_items(self, project_items):
+    def _fill_items(self, project_items: list[ProjectItem]):
         new_project_names = {
             project_item.name
             for project_item in project_items
@@ -252,6 +300,7 @@ class ProjectsQtModel(QtGui.QStandardItemModel):
             item.setData(project_name, PROJECT_NAME_ROLE)
             item.setData(project_item.active, PROJECT_IS_ACTIVE_ROLE)
             item.setData(project_item.is_library, PROJECT_IS_LIBRARY_ROLE)
+            item.setData(project_item.is_pinned, PROJECT_IS_PINNED_ROLE)
             is_current = project_name == self._current_context_project
             item.setData(is_current, PROJECT_IS_CURRENT_ROLE)
             self._project_items[project_name] = item
@@ -279,7 +328,7 @@ class ProjectsQtModel(QtGui.QStandardItemModel):
 
 class ProjectSortFilterProxy(QtCore.QSortFilterProxyModel):
     def __init__(self, *args, **kwargs):
-        super(ProjectSortFilterProxy, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
         self._filter_inactive = True
         self._filter_standard = False
         self._filter_library = False
@@ -323,26 +372,51 @@ class ProjectSortFilterProxy(QtCore.QSortFilterProxyModel):
             return False
 
         # Library separator should be before library projects
-        result = self._type_sort(left_index, right_index)
-        if result is not None:
-            return result
+        l_is_library = left_index.data(PROJECT_IS_LIBRARY_ROLE)
+        r_is_library = right_index.data(PROJECT_IS_LIBRARY_ROLE)
+        l_is_sep = left_index.data(LIBRARY_PROJECT_SEPARATOR_ROLE)
+        r_is_sep = right_index.data(LIBRARY_PROJECT_SEPARATOR_ROLE)
+        if l_is_sep:
+            return bool(r_is_library)
 
-        if left_index.data(PROJECT_NAME_ROLE) is None:
+        if r_is_sep:
+            return not l_is_library
+
+        # Non project items should be on top
+        l_project_name = left_index.data(PROJECT_NAME_ROLE)
+        r_project_name = right_index.data(PROJECT_NAME_ROLE)
+        if l_project_name is None:
             return True
-
-        if right_index.data(PROJECT_NAME_ROLE) is None:
+        if r_project_name is None:
             return False
 
         left_is_active = left_index.data(PROJECT_IS_ACTIVE_ROLE)
         right_is_active = right_index.data(PROJECT_IS_ACTIVE_ROLE)
-        if right_is_active == left_is_active:
-            return super(ProjectSortFilterProxy, self).lessThan(
-                left_index, right_index
-            )
+        if right_is_active != left_is_active:
+            return left_is_active
 
-        if left_is_active:
+        l_is_pinned = left_index.data(PROJECT_IS_PINNED_ROLE)
+        r_is_pinned = right_index.data(PROJECT_IS_PINNED_ROLE)
+        if l_is_pinned is True and not r_is_pinned:
             return True
-        return False
+
+        if r_is_pinned is True and not l_is_pinned:
+            return False
+
+        # Move inactive projects to the end
+        left_is_active = left_index.data(PROJECT_IS_ACTIVE_ROLE)
+        right_is_active = right_index.data(PROJECT_IS_ACTIVE_ROLE)
+        if right_is_active != left_is_active:
+            return left_is_active
+
+        # Move library projects after standard projects
+        if (
+            l_is_library is not None
+            and r_is_library is not None
+            and l_is_library != r_is_library
+        ):
+            return r_is_library
+        return super().lessThan(left_index, right_index)
 
     def filterAcceptsRow(self, source_row, source_parent):
         index = self.sourceModel().index(source_row, 0, source_parent)
@@ -415,15 +489,153 @@ class ProjectSortFilterProxy(QtCore.QSortFilterProxyModel):
         self.invalidate()
 
 
+class ProjectsDelegate(QtWidgets.QStyledItemDelegate):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._pin_icon = None
+
+    def paint(self, painter, option, index):
+        is_pinned = index.data(PROJECT_IS_PINNED_ROLE)
+        if not is_pinned:
+            super().paint(painter, option, index)
+            return
+        opt = QtWidgets.QStyleOptionViewItem(option)
+        self.initStyleOption(opt, index)
+        widget = option.widget
+        if widget is None:
+            style = QtWidgets.QApplication.style()
+        else:
+            style = widget.style()
+        # CE_ItemViewItem
+        proxy = style.proxy()
+        painter.save()
+        painter.setClipRect(option.rect)
+        decor_rect = proxy.subElementRect(
+            QtWidgets.QStyle.SE_ItemViewItemDecoration, opt, widget
+        )
+        text_rect = proxy.subElementRect(
+            QtWidgets.QStyle.SE_ItemViewItemText, opt, widget
+        )
+        proxy.drawPrimitive(
+            QtWidgets.QStyle.PE_PanelItemViewItem, opt, painter, widget
+        )
+        mode = QtGui.QIcon.Normal
+        if not opt.state & QtWidgets.QStyle.State_Enabled:
+            mode = QtGui.QIcon.Disabled
+        elif opt.state & QtWidgets.QStyle.State_Selected:
+            mode = QtGui.QIcon.Selected
+        state = QtGui.QIcon.Off
+        if opt.state & QtWidgets.QStyle.State_Open:
+            state = QtGui.QIcon.On
+
+        # Draw project icon
+        opt.icon.paint(
+            painter, decor_rect, opt.decorationAlignment, mode, state
+        )
+
+        # Draw pin icon
+        if index.data(PROJECT_IS_PINNED_ROLE):
+            pin_icon = self._get_pin_icon()
+            pin_rect = QtCore.QRect(decor_rect)
+            diff = option.rect.width() - pin_rect.width()
+            pin_rect.moveLeft(diff)
+            pin_icon.paint(
+                painter, pin_rect, opt.decorationAlignment, mode, state
+            )
+
+        # Draw text
+        if opt.text:
+            if not opt.state & QtWidgets.QStyle.State_Enabled:
+                cg = QtGui.QPalette.Disabled
+            elif not (opt.state & QtWidgets.QStyle.State_Active):
+                cg = QtGui.QPalette.Inactive
+            else:
+                cg = QtGui.QPalette.Normal
+
+            if opt.state & QtWidgets.QStyle.State_Selected:
+                painter.setPen(
+                    opt.palette.color(cg, QtGui.QPalette.HighlightedText)
+                )
+            else:
+                painter.setPen(opt.palette.color(cg, QtGui.QPalette.Text))
+
+            if opt.state & QtWidgets.QStyle.State_Editing:
+                painter.setPen(opt.palette.color(cg, QtGui.QPalette.Text))
+                painter.drawRect(text_rect.adjusted(0, 0, -1, -1))
+
+            margin = proxy.pixelMetric(
+                QtWidgets.QStyle.PM_FocusFrameHMargin, None, widget
+            ) + 1
+            text_rect.adjust(margin, 0, -margin, 0)
+            # NOTE skipping some steps e.g. word wrapping and elided
+            #   text (adding '...' when too long).
+            painter.drawText(
+                text_rect,
+                opt.displayAlignment,
+                opt.text
+            )
+
+        # Draw focus rect
+        if opt.state & QtWidgets.QStyle.State_HasFocus:
+            focus_opt = QtWidgets.QStyleOptionFocusRect()
+            focus_opt.state = option.state
+            focus_opt.direction = option.direction
+            focus_opt.rect = option.rect
+            focus_opt.fontMetrics = option.fontMetrics
+            focus_opt.palette = option.palette
+
+            focus_opt.rect = style.subElementRect(
+                QtWidgets.QCommonStyle.SE_ItemViewItemFocusRect,
+                option,
+                option.widget
+            )
+            focus_opt.state |= (
+                QtWidgets.QStyle.State_KeyboardFocusChange
+                | QtWidgets.QStyle.State_Item
+            )
+            focus_opt.backgroundColor = option.palette.color(
+                (
+                    QtGui.QPalette.Normal
+                    if option.state & QtWidgets.QStyle.State_Enabled
+                    else QtGui.QPalette.Disabled
+                ),
+                (
+                    QtGui.QPalette.Highlight
+                    if option.state & QtWidgets.QStyle.State_Selected
+                    else QtGui.QPalette.Window
+                )
+            )
+            style.drawPrimitive(
+                QtWidgets.QCommonStyle.PE_FrameFocusRect,
+                focus_opt,
+                painter,
+                option.widget
+            )
+        painter.restore()
+
+    def _get_pin_icon(self):
+        if self._pin_icon is None:
+            self._pin_icon = get_qt_icon({
+                "type": "material-symbols",
+                "name": "keep",
+            })
+        return self._pin_icon
+
+
 class ProjectsCombobox(QtWidgets.QWidget):
     refreshed = QtCore.Signal()
-    selection_changed = QtCore.Signal()
+    selection_changed = QtCore.Signal(str)
 
-    def __init__(self, controller, parent, handle_expected_selection=False):
-        super(ProjectsCombobox, self).__init__(parent)
+    def __init__(
+        self,
+        controller: AbstractProjectController,
+        parent: QtWidgets.QWidget,
+        handle_expected_selection: bool = False,
+    ):
+        super().__init__(parent)
 
         projects_combobox = QtWidgets.QComboBox(self)
-        combobox_delegate = QtWidgets.QStyledItemDelegate(projects_combobox)
+        combobox_delegate = ProjectsDelegate(projects_combobox)
         projects_combobox.setItemDelegate(combobox_delegate)
         projects_model = ProjectsQtModel(controller)
         projects_proxy_model = ProjectSortFilterProxy()
@@ -468,7 +680,7 @@ class ProjectsCombobox(QtWidgets.QWidget):
     def refresh(self):
         self._projects_model.refresh()
 
-    def set_selection(self, project_name):
+    def set_selection(self, project_name: str):
         """Set selection to a given project.
 
         Selection change is ignored if project is not found.
@@ -480,8 +692,8 @@ class ProjectsCombobox(QtWidgets.QWidget):
             bool: True if selection was changed, False otherwise. NOTE:
                 Selection may not be changed if project is not found, or if
                 project is already selected.
-        """
 
+        """
         idx = self._projects_combobox.findData(
             project_name, PROJECT_NAME_ROLE)
         if idx < 0:
@@ -491,7 +703,7 @@ class ProjectsCombobox(QtWidgets.QWidget):
             return True
         return False
 
-    def set_listen_to_selection_change(self, listen):
+    def set_listen_to_selection_change(self, listen: bool):
         """Disable listening to changes of the selection.
 
         Because combobox is triggering selection change when it's model
@@ -517,11 +729,11 @@ class ProjectsCombobox(QtWidgets.QWidget):
             return None
         return self._projects_combobox.itemData(idx, PROJECT_NAME_ROLE)
 
-    def set_current_context_project(self, project_name):
+    def set_current_context_project(self, project_name: str):
         self._projects_model.set_current_context_project(project_name)
         self._projects_proxy_model.invalidateFilter()
 
-    def set_select_item_visible(self, visible):
+    def set_select_item_visible(self, visible: bool):
         self._select_item_visible = visible
         self._projects_model.set_select_item_visible(visible)
         self._update_select_item_visiblity()
@@ -559,7 +771,7 @@ class ProjectsCombobox(QtWidgets.QWidget):
             idx, PROJECT_NAME_ROLE)
         self._update_select_item_visiblity(project_name=project_name)
         self._controller.set_selected_project(project_name)
-        self.selection_changed.emit()
+        self.selection_changed.emit(project_name or "")
 
     def _on_model_refresh(self):
         self._projects_proxy_model.sort(0)
@@ -614,5 +826,119 @@ class ProjectsCombobox(QtWidgets.QWidget):
 
 
 class ProjectsWidget(QtWidgets.QWidget):
-    # TODO implement
-    pass
+    """Projects widget showing projects in list.
+
+    Warnings:
+        This widget does not support expected selection handling.
+
+    """
+    refreshed = QtCore.Signal()
+    selection_changed = QtCore.Signal(str)
+    double_clicked = QtCore.Signal()
+
+    def __init__(
+        self,
+        controller: AbstractProjectController,
+        parent: Optional[QtWidgets.QWidget] = None
+    ):
+        super().__init__(parent=parent)
+
+        projects_view = ListView(parent=self)
+        projects_view.setResizeMode(QtWidgets.QListView.Adjust)
+        projects_view.setVerticalScrollMode(
+            QtWidgets.QAbstractItemView.ScrollPerPixel
+        )
+        projects_view.setAlternatingRowColors(False)
+        projects_view.setWrapping(False)
+        projects_view.setWordWrap(False)
+        projects_view.setSpacing(0)
+        projects_delegate = ProjectsDelegate(projects_view)
+        projects_view.setItemDelegate(projects_delegate)
+        projects_view.activate_flick_charm()
+        projects_view.set_deselectable(True)
+
+        projects_model = ProjectsQtModel(controller)
+        projects_proxy_model = ProjectSortFilterProxy()
+        projects_proxy_model.setSourceModel(projects_model)
+        projects_view.setModel(projects_proxy_model)
+
+        main_layout = QtWidgets.QVBoxLayout(self)
+        main_layout.setContentsMargins(0, 0, 0, 0)
+        main_layout.addWidget(projects_view, 1)
+
+        projects_view.selectionModel().selectionChanged.connect(
+            self._on_selection_change
+        )
+        projects_view.double_clicked.connect(self.double_clicked)
+        projects_model.refreshed.connect(self._on_model_refresh)
+
+        controller.register_event_callback(
+            "projects.refresh.finished",
+            self._on_projects_refresh_finished
+        )
+
+        self._controller = controller
+
+        self._projects_view = projects_view
+        self._projects_model = projects_model
+        self._projects_proxy_model = projects_proxy_model
+        self._projects_delegate = projects_delegate
+
+    def refresh(self):
+        self._projects_model.refresh()
+
+    def has_content(self) -> bool:
+        """Model has at least one project.
+
+        Returns:
+             bool: True if there is any content in the model.
+
+        """
+        return self._projects_model.has_content()
+
+    def set_name_filter(self, text: str):
+        self._projects_proxy_model.setFilterFixedString(text)
+
+    def get_selected_project(self) -> Optional[str]:
+        selection_model = self._projects_view.selectionModel()
+        for index in selection_model.selectedIndexes():
+            project_name = index.data(PROJECT_NAME_ROLE)
+            if project_name:
+                return project_name
+        return None
+
+    def set_selected_project(self, project_name: Optional[str]):
+        if project_name is None:
+            self._projects_view.clearSelection()
+            self._projects_view.setCurrentIndex(QtCore.QModelIndex())
+            return
+
+        index = self._projects_model.get_index_by_project_name(project_name)
+        if not index.isValid():
+            return
+        proxy_index = self._projects_proxy_model.mapFromSource(index)
+        if proxy_index.isValid():
+            selection_model = self._projects_view.selectionModel()
+            selection_model.select(
+                proxy_index,
+                QtCore.QItemSelectionModel.ClearAndSelect
+            )
+
+    def _on_model_refresh(self):
+        self._projects_proxy_model.sort(0)
+        self._projects_proxy_model.invalidateFilter()
+        self.refreshed.emit()
+
+    def _on_selection_change(self, new_selection, _old_selection):
+        project_name = None
+        for index in new_selection.indexes():
+            name = index.data(PROJECT_NAME_ROLE)
+            if name:
+                project_name = name
+                break
+        self.selection_changed.emit(project_name or "")
+        self._controller.set_selected_project(project_name)
+
+    def _on_projects_refresh_finished(self, event):
+        if event["sender"] != PROJECTS_MODEL_SENDER:
+            self._projects_model.refresh()

client/ayon_core/tools/utils/views.py

@@ -37,7 +37,7 @@ class TreeView(QtWidgets.QTreeView):
     double_clicked = QtCore.Signal(QtGui.QMouseEvent)
 
     def __init__(self, *args, **kwargs):
-        super(TreeView, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
         self._deselectable = False
 
         self._flick_charm_activated = False
@@ -60,12 +60,64 @@ class TreeView(QtWidgets.QTreeView):
                 self.clearSelection()
                 # clear the current index
                 self.setCurrentIndex(QtCore.QModelIndex())
-        super(TreeView, self).mousePressEvent(event)
+        super().mousePressEvent(event)
 
     def mouseDoubleClickEvent(self, event):
         self.double_clicked.emit(event)
 
-        return super(TreeView, self).mouseDoubleClickEvent(event)
+        return super().mouseDoubleClickEvent(event)
+
+    def activate_flick_charm(self):
+        if self._flick_charm_activated:
+            return
+        self._flick_charm_activated = True
+        self._before_flick_scroll_mode = self.verticalScrollMode()
+        self._flick_charm.activateOn(self)
+        self.setVerticalScrollMode(QtWidgets.QAbstractItemView.ScrollPerPixel)
+
+    def deactivate_flick_charm(self):
+        if not self._flick_charm_activated:
+            return
+        self._flick_charm_activated = False
+        self._flick_charm.deactivateFrom(self)
+        if self._before_flick_scroll_mode is not None:
+            self.setVerticalScrollMode(self._before_flick_scroll_mode)
+
+
+class ListView(QtWidgets.QListView):
+    """A tree view that deselects on clicking on an empty area in the view"""
+    double_clicked = QtCore.Signal(QtGui.QMouseEvent)
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._deselectable = False
+
+        self._flick_charm_activated = False
+        self._flick_charm = FlickCharm(parent=self)
+        self._before_flick_scroll_mode = None
+
+    def is_deselectable(self):
+        return self._deselectable
+
+    def set_deselectable(self, deselectable):
+        self._deselectable = deselectable
+
+    deselectable = property(is_deselectable, set_deselectable)
+
+    def mousePressEvent(self, event):
+        if self._deselectable:
+            index = self.indexAt(event.pos())
+            if not index.isValid():
+                # clear the selection
+                self.clearSelection()
+                # clear the current index
+                self.setCurrentIndex(QtCore.QModelIndex())
+        super().mousePressEvent(event)
+
+    def mouseDoubleClickEvent(self, event):
+        self.double_clicked.emit(event)
+
+        return super().mouseDoubleClickEvent(event)
 
     def activate_flick_charm(self):
         if self._flick_charm_activated:

pyproject.toml

@@ -20,15 +20,12 @@ pytest = "^8.0"
 pytest-print = "^1.0"
 ayon-python-api = "^1.0"
 # linting dependencies
-ruff = "0.11.7"
-pre-commit = "^3.6.2"
+ruff = "^0.11.7"
+pre-commit = "^4"
 codespell = "^2.2.6"
 semver = "^3.0.2"
+mypy = "^1.14.0"
 mock = "^5.0.0"
-attrs = "^25.0.0"
-pyblish-base = "^1.8.7"
-clique = "^2.0.0"
-opentimelineio = "^0.17.0"
 tomlkit = "^0.13.2"
 requests = "^2.32.3"
 mkdocs-material = "^9.6.7"
@@ -41,6 +38,16 @@ pymdown-extensions = "^10.14.3"
 mike = "^2.1.3"
 mkdocstrings-shell = "^1.0.2"
 
+[tool.poetry.group.test.dependencies]
+attrs = "^25.0.0"
+pyblish-base = "^1.8.7"
+clique = "^2.0.0"
+opentimelineio = "^0.17.0"
+speedcopy = "^2.1"
+qtpy="^2.4.3"
+pyside6 = "^6.5.2"
+pytest-ayon = { git = "https://github.com/ynput/pytest-ayon.git", branch = "chore/align-dependencies" }
+
 [tool.codespell]
 # Ignore words that are not in the dictionary.
 ignore-words-list = "ayon,ynput,parms,parm,hda,developpement"
@@ -53,11 +60,13 @@ skip = "./.*,./package/*,*/client/ayon_core/vendor/*"
 count = true
 quiet-level = 3
 
+[tool.mypy]
+mypy_path = "$MYPY_CONFIG_FILE_DIR/client"
+
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"
 
-
 [tool.pytest.ini_options]
 log_cli = true
 log_cli_level = "INFO"
@@ -65,3 +74,11 @@ addopts = "-ra -q"
 testpaths = [
     "client/ayon_core/tests"
 ]
+markers = [
+    "unit: Unit tests",
+    "integration: Integration tests",
+    "api: API tests",
+    "cli: CLI tests",
+    "slow: Slow tests",
+    "server: Tests that require a running AYON server",
+]

ruff.toml

@@ -57,6 +57,7 @@ exclude = [
 
 [lint.per-file-ignores]
 "client/ayon_core/lib/__init__.py" = ["E402"]
+"tests/*.py" = ["S101", "PLR2004"]  # allow asserts and magical values
 
 [format]
 # Like Black, use double quotes for strings.

tests/__init__.py

@@ -0,0 +1 @@
+"""Tests."""

tests/client/ayon_core/pipeline/traits/__init__.py

@@ -0,0 +1 @@
+"""Tests for the representation traits."""

tests/client/ayon_core/pipeline/traits/lib/__init__.py

@@ -0,0 +1,25 @@
+"""Metadata traits."""
+from typing import ClassVar
+
+from ayon_core.pipeline.traits import TraitBase
+
+
+class NewTestTrait(TraitBase):
+    """New Test trait model.
+
+    This model represents a tagged trait.
+
+    Attributes:
+        name (str): Trait name.
+        description (str): Trait description.
+        id (str): id should be namespaced trait name with version
+    """
+
+    name: ClassVar[str] = "New Test Trait"
+    description: ClassVar[str] = (
+        "This test trait is used for testing updating."
+    )
+    id: ClassVar[str] = "ayon.test.NewTestTrait.v999"
+
+
+__all__ = ["NewTestTrait"]

tests/client/ayon_core/pipeline/traits/test_content_traits.py

@@ -0,0 +1,184 @@
+"""Tests for the content traits."""
+from __future__ import annotations
+
+import re
+from pathlib import Path
+
+import pytest
+from ayon_core.pipeline.traits import (
+    Bundle,
+    FileLocation,
+    FileLocations,
+    FrameRanged,
+    Image,
+    MimeType,
+    PixelBased,
+    Planar,
+    Representation,
+    Sequence,
+)
+from ayon_core.pipeline.traits.trait import TraitValidationError
+
+
+def test_bundles() -> None:
+    """Test bundle trait."""
+    diffuse_texture = [
+        Image(),
+        PixelBased(
+            display_window_width=1920,
+            display_window_height=1080,
+            pixel_aspect_ratio=1.0),
+        Planar(planar_configuration="RGB"),
+        FileLocation(
+            file_path=Path("/path/to/diffuse.jpg"),
+            file_size=1024,
+            file_hash=None),
+        MimeType(mime_type="image/jpeg"),
+    ]
+    bump_texture = [
+        Image(),
+        PixelBased(
+            display_window_width=1920,
+            display_window_height=1080,
+            pixel_aspect_ratio=1.0),
+        Planar(planar_configuration="RGB"),
+        FileLocation(
+            file_path=Path("/path/to/bump.tif"),
+            file_size=1024,
+            file_hash=None),
+        MimeType(mime_type="image/tiff"),
+    ]
+    bundle = Bundle(items=[diffuse_texture, bump_texture])
+    representation = Representation(name="test_bundle", traits=[bundle])
+
+    if representation.contains_trait(trait=Bundle):
+        assert representation.get_trait(trait=Bundle).items == [
+            diffuse_texture, bump_texture
+        ]
+
+    for item in representation.get_trait(trait=Bundle).items:
+        sub_representation = Representation(name="test", traits=item)
+        assert sub_representation.contains_trait(trait=Image)
+        sub: MimeType = sub_representation.get_trait(trait=MimeType)
+        assert sub.mime_type in {
+            "image/jpeg", "image/tiff"
+        }
+
+
+def test_file_locations_validation() -> None:
+    """Test FileLocations trait validation."""
+    file_locations_list = [
+        FileLocation(
+            file_path=Path(f"/path/to/file.{frame}.exr"),
+            file_size=1024,
+            file_hash=None,
+        )
+        for frame in range(1001, 1051)
+    ]
+
+    representation = Representation(name="test", traits=[
+        FileLocations(file_paths=file_locations_list),
+        Sequence(frame_padding=4),
+    ])
+
+    file_locations_trait: FileLocations = FileLocations(
+        file_paths=file_locations_list)
+
+    # this should be valid trait
+    file_locations_trait.validate_trait(representation)
+
+    # add valid FrameRanged trait
+    frameranged_trait = FrameRanged(
+        frame_start=1001,
+        frame_end=1050,
+        frames_per_second="25"
+    )
+    representation.add_trait(frameranged_trait)
+
+    # it should still validate fine
+    file_locations_trait.validate_trait(representation)
+
+    # create empty file locations trait
+    empty_file_locations_trait = FileLocations(file_paths=[])
+    representation = Representation(name="test", traits=[
+        empty_file_locations_trait
+    ])
+    with pytest.raises(TraitValidationError):
+        empty_file_locations_trait.validate_trait(representation)
+
+    # create valid file locations trait but with not matching
+    # frame range trait
+    representation = Representation(name="test", traits=[
+        FileLocations(file_paths=file_locations_list),
+        Sequence(frame_padding=4),
+    ])
+    invalid_sequence_trait = FrameRanged(
+        frame_start=1001,
+        frame_end=1051,
+        frames_per_second="25"
+    )
+
+    representation.add_trait(invalid_sequence_trait)
+    with pytest.raises(TraitValidationError):
+        file_locations_trait.validate_trait(representation)
+
+    # invalid representation with multiple file locations but
+    # unrelated to either Sequence or Bundle traits
+    representation = Representation(name="test", traits=[
+        FileLocations(file_paths=[
+            FileLocation(
+                file_path=Path("/path/to/file_foo.exr"),
+                file_size=1024,
+                file_hash=None,
+            ),
+            FileLocation(
+                file_path=Path("/path/to/anotherfile.obj"),
+                file_size=1234,
+                file_hash=None,
+            )
+        ])
+    ])
+
+    with pytest.raises(TraitValidationError):
+        representation.validate()
+
+
+def test_get_file_location_from_frame() -> None:
+    """Test get_file_location_from_frame method."""
+    file_locations_list = [
+        FileLocation(
+            file_path=Path(f"/path/to/file.{frame}.exr"),
+            file_size=1024,
+            file_hash=None,
+        )
+        for frame in range(1001, 1051)
+    ]
+
+    file_locations_trait: FileLocations = FileLocations(
+        file_paths=file_locations_list)
+
+    assert file_locations_trait.get_file_location_for_frame(frame=1001) == \
+        file_locations_list[0]
+    assert file_locations_trait.get_file_location_for_frame(frame=1050) == \
+        file_locations_list[-1]
+    assert file_locations_trait.get_file_location_for_frame(frame=1100) is None
+
+    # test with custom regex
+    sequence = Sequence(
+        frame_padding=4,
+        frame_regex=re.compile(r"boo_(?P<index>(?P<padding>0*)\d+)\.exr"))
+    file_locations_list = [
+        FileLocation(
+            file_path=Path(f"/path/to/boo_{frame}.exr"),
+            file_size=1024,
+            file_hash=None,
+        )
+        for frame in range(1001, 1051)
+    ]
+
+    file_locations_trait = FileLocations(
+        file_paths=file_locations_list)
+
+    assert file_locations_trait.get_file_location_for_frame(
+        frame=1001, sequence_trait=sequence) == \
+            file_locations_list[0]

tests/client/ayon_core/pipeline/traits/test_time_traits.py

@@ -0,0 +1,248 @@
+"""Tests for the time related traits."""
+from __future__ import annotations
+
+import re
+from pathlib import Path
+
+import pytest
+from ayon_core.pipeline.traits import (
+    FileLocation,
+    FileLocations,
+    FrameRanged,
+    Handles,
+    Representation,
+    Sequence,
+)
+from ayon_core.pipeline.traits.trait import TraitValidationError
+
+
+def test_sequence_validations() -> None:
+    """Test Sequence trait validation."""
+    file_locations_list = [
+        FileLocation(
+            file_path=Path(f"/path/to/file.{frame}.exr"),
+            file_size=1024,
+            file_hash=None,
+        )
+        for frame in range(1001, 1010 + 1)  # because range is zero based
+    ]
+
+    file_locations_list += [
+        FileLocation(
+            file_path=Path(f"/path/to/file.{frame}.exr"),
+            file_size=1024,
+            file_hash=None,
+        )
+        for frame in range(1015, 1020 + 1)
+    ]
+
+    file_locations_list += [
+        FileLocation
+        (
+            file_path=Path("/path/to/file.1100.exr"),
+            file_size=1024,
+            file_hash=None,
+        )
+    ]
+
+    representation = Representation(name="test_1", traits=[
+        FileLocations(file_paths=file_locations_list),
+        FrameRanged(
+            frame_start=1001,
+            frame_end=1100, frames_per_second="25"),
+        Sequence(
+            frame_padding=4,
+            frame_spec="1001-1010,1015-1020,1100")
+    ])
+
+    representation.get_trait(Sequence).validate_trait(representation)
+
+    # here we set handles and set them as inclusive, so this should pass
+    representation = Representation(name="test_2", traits=[
+        FileLocations(file_paths=[
+        FileLocation(
+            file_path=Path(f"/path/to/file.{frame}.exr"),
+            file_size=1024,
+            file_hash=None,
+        )
+        for frame in range(1001, 1100 + 1)  # because range is zero based
+    ]),
+        Handles(
+            frame_start_handle=5,
+            frame_end_handle=5,
+            inclusive=True
+        ),
+        FrameRanged(
+            frame_start=1001,
+            frame_end=1100, frames_per_second="25"),
+        Sequence(frame_padding=4)
+    ])
+
+    representation.validate()
+
+    # do the same but set handles as exclusive
+    representation = Representation(name="test_3", traits=[
+        FileLocations(file_paths=[
+            FileLocation(
+                file_path=Path(f"/path/to/file.{frame}.exr"),
+                file_size=1024,
+                file_hash=None,
+            )
+            for frame in range(996, 1105 + 1)  # because range is zero based
+        ]),
+        Handles(
+            frame_start_handle=5,
+            frame_end_handle=5,
+            inclusive=False
+        ),
+        FrameRanged(
+            frame_start=1001,
+            frame_end=1100, frames_per_second="25"),
+        Sequence(frame_padding=4)
+    ])
+
+    representation.validate()
+
+    # invalid representation with file range not extended for handles
+    representation = Representation(name="test_4", traits=[
+            FileLocations(file_paths=[
+            FileLocation(
+                file_path=Path(f"/path/to/file.{frame}.exr"),
+                file_size=1024,
+                file_hash=None,
+            )
+            for frame in range(1001, 1050 + 1)  # because range is zero based
+        ]),
+            Handles(
+                frame_start_handle=5,
+                frame_end_handle=5,
+                inclusive=False
+            ),
+            FrameRanged(
+                frame_start=1001,
+                frame_end=1050, frames_per_second="25"),
+            Sequence(frame_padding=4)
+        ])
+
+    with pytest.raises(TraitValidationError):
+        representation.validate()
+
+    # invalid representation with frame spec not matching the files
+    del representation
+    representation = Representation(name="test_5", traits=[
+        FileLocations(file_paths=[
+            FileLocation(
+                file_path=Path(f"/path/to/file.{frame}.exr"),
+                file_size=1024,
+                file_hash=None,
+            )
+            for frame in range(1001, 1050 + 1)  # because range is zero based
+        ]),
+        FrameRanged(
+            frame_start=1001,
+            frame_end=1050, frames_per_second="25"),
+        Sequence(frame_padding=4, frame_spec="1001-1010,1012-2000")
+    ])
+    with pytest.raises(TraitValidationError):
+        representation.validate()
+
+    representation = Representation(name="test_6", traits=[
+        FileLocations(file_paths=[
+            FileLocation(
+                file_path=Path(f"/path/to/file.{frame}.exr"),
+                file_size=1024,
+                file_hash=None,
+            )
+            for frame in range(1001, 1050 + 1)  # because range is zero based
+        ]),
+        Sequence(frame_padding=4, frame_spec="1-1010,1012-1050"),
+        Handles(
+            frame_start_handle=5,
+            frame_end_handle=5,
+            inclusive=False
+        )
+    ])
+    with pytest.raises(TraitValidationError):
+        representation.validate()
+
+    representation = Representation(name="test_6", traits=[
+        FileLocations(file_paths=[
+            FileLocation(
+                file_path=Path(f"/path/to/file.{frame}.exr"),
+                file_size=1024,
+                file_hash=None,
+            )
+            for frame in range(996, 1050 + 1)  # because range is zero based
+        ]),
+        Sequence(frame_padding=4, frame_spec="1001-1010,1012-2000"),
+        Handles(
+            frame_start_handle=5,
+            frame_end_handle=5,
+            inclusive=False
+        )
+    ])
+    with pytest.raises(TraitValidationError):
+        representation.validate()
+
+    representation = Representation(name="test_7", traits=[
+        FileLocations(file_paths=[
+            FileLocation(
+                file_path=Path(f"/path/to/file.{frame}.exr"),
+                file_size=1024,
+                file_hash=None,
+            )
+            for frame in range(996, 1050 + 1)  # because range is zero based
+        ]),
+        Sequence(
+            frame_padding=4,
+            frame_regex=re.compile(
+                    r"img\.(?P<index>(?P<padding>0*)\d{4})\.png$")),
+        Handles(
+            frame_start_handle=5,
+            frame_end_handle=5,
+            inclusive=False
+        )
+    ])
+    representation.validate()
+
+
+def test_list_spec_to_frames() -> None:
+    """Test converting list specification to frames."""
+    assert Sequence.list_spec_to_frames("1-10,20-30,55") == [
+        1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
+        20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 55
+    ]
+    assert Sequence.list_spec_to_frames("1,2,3,4,5") == [
+        1, 2, 3, 4, 5
+    ]
+    assert Sequence.list_spec_to_frames("1-10") == [
+        1, 2, 3, 4, 5, 6, 7, 8, 9, 10
+    ]
+    test_list = list(range(1001, 1011))
+    test_list += list(range(1012, 2001))
+    assert Sequence.list_spec_to_frames("1001-1010,1012-2000") == test_list
+
+    assert Sequence.list_spec_to_frames("1") == [1]
+    with pytest.raises(
+            ValueError,
+            match=r"Invalid frame number in the list: .*"):
+        Sequence.list_spec_to_frames("a")
+
+
+def test_sequence_get_frame_padding() -> None:
+    """Test getting frame padding from FileLocations trait."""
+    file_locations_list = [
+        FileLocation(
+            file_path=Path(f"/path/to/file.{frame}.exr"),
+            file_size=1024,
+            file_hash=None,
+        )
+        for frame in range(1001, 1051)
+    ]
+
+    representation = Representation(name="test", traits=[
+        FileLocations(file_paths=file_locations_list)
+    ])
+
+    assert Sequence.get_frame_padding(
+        file_locations=representation.get_trait(FileLocations)) == 4

tests/client/ayon_core/pipeline/traits/test_traits.py

@@ -0,0 +1,405 @@
+"""Tests for the representation traits."""
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+from ayon_core.pipeline.traits import (
+    Bundle,
+    FileLocation,
+    Image,
+    MimeType,
+    Overscan,
+    PixelBased,
+    Planar,
+    Representation,
+    TraitBase,
+)
+
+REPRESENTATION_DATA: dict = {
+        FileLocation.id: {
+            "file_path": Path("/path/to/file"),
+            "file_size": 1024,
+            "file_hash": None,
+            # "persistent": True,
+        },
+        Image.id: {},
+        PixelBased.id: {
+            "display_window_width": 1920,
+            "display_window_height": 1080,
+            "pixel_aspect_ratio": 1.0,
+            # "persistent": True,
+        },
+        Planar.id: {
+            "planar_configuration": "RGB",
+            # "persistent": True,
+        },
+    }
+
+
+class UpgradedImage(Image):
+    """Upgraded image class."""
+    id = "ayon.2d.Image.v2"
+
+    @classmethod
+    def upgrade(cls, data: dict) -> UpgradedImage:  # noqa: ARG003
+        """Upgrade the trait.
+
+        Returns:
+            UpgradedImage: Upgraded image instance.
+
+        """
+        return cls()
+
+
+class InvalidTrait:
+    """Invalid trait class."""
+    foo = "bar"
+
+
+@pytest.fixture
+def representation() -> Representation:
+    """Return a traits data instance."""
+    return Representation(name="test", traits=[
+        FileLocation(**REPRESENTATION_DATA[FileLocation.id]),
+        Image(),
+        PixelBased(**REPRESENTATION_DATA[PixelBased.id]),
+        Planar(**REPRESENTATION_DATA[Planar.id]),
+    ])
+
+
+def test_representation_errors(representation: Representation) -> None:
+    """Test errors in representation."""
+    with pytest.raises(ValueError,
+                       match=r"Invalid trait .* - ID is required."):
+        representation.add_trait(InvalidTrait())
+
+    with pytest.raises(ValueError,
+                       match=f"Trait with ID {Image.id} already exists."):
+        representation.add_trait(Image())
+
+    with pytest.raises(ValueError,
+                       match=r"Trait with ID .* not found."):
+        representation.remove_trait_by_id("foo")
+
+
+def test_representation_traits(representation: Representation) -> None:
+    """Test setting and getting traits."""
+    assert representation.get_trait_by_id(
+        "ayon.2d.PixelBased").get_version() == 1
+
+    assert len(representation) == len(REPRESENTATION_DATA)
+    assert representation.get_trait_by_id(FileLocation.id)
+    assert representation.get_trait_by_id(Image.id)
+    assert representation.get_trait_by_id(trait_id="ayon.2d.Image.v1")
+    assert representation.get_trait_by_id(PixelBased.id)
+    assert representation.get_trait_by_id(trait_id="ayon.2d.PixelBased.v1")
+    assert representation.get_trait_by_id(Planar.id)
+    assert representation.get_trait_by_id(trait_id="ayon.2d.Planar.v1")
+
+    assert representation.get_trait(FileLocation)
+    assert representation.get_trait(Image)
+    assert representation.get_trait(PixelBased)
+    assert representation.get_trait(Planar)
+
+    assert issubclass(
+        type(representation.get_trait(FileLocation)), TraitBase)
+
+    assert representation.get_trait(FileLocation) == \
+           representation.get_trait_by_id(FileLocation.id)
+    assert representation.get_trait(Image) == \
+           representation.get_trait_by_id(Image.id)
+    assert representation.get_trait(PixelBased) == \
+           representation.get_trait_by_id(PixelBased.id)
+    assert representation.get_trait(Planar) == \
+           representation.get_trait_by_id(Planar.id)
+
+    assert representation.get_trait_by_id(
+        "ayon.2d.PixelBased.v1").display_window_width == \
+           REPRESENTATION_DATA[PixelBased.id]["display_window_width"]
+    assert representation.get_trait(
+        trait=PixelBased).display_window_height == \
+           REPRESENTATION_DATA[PixelBased.id]["display_window_height"]
+
+    repre_dict = {
+        FileLocation.id: FileLocation(**REPRESENTATION_DATA[FileLocation.id]),
+        Image.id: Image(),
+        PixelBased.id: PixelBased(**REPRESENTATION_DATA[PixelBased.id]),
+        Planar.id: Planar(**REPRESENTATION_DATA[Planar.id]),
+    }
+    assert representation.get_traits() == repre_dict
+
+    assert representation.get_traits_by_ids(
+        trait_ids=[FileLocation.id, Image.id, PixelBased.id, Planar.id]) == \
+           repre_dict
+    assert representation.get_traits(
+        [FileLocation, Image, PixelBased, Planar]) == \
+              repre_dict
+
+    assert representation.has_traits() is True
+    empty_representation: Representation = Representation(
+        name="test", traits=[])
+    assert empty_representation.has_traits() is False
+
+    assert representation.contains_trait(trait=FileLocation) is True
+    assert representation.contains_traits([Image, FileLocation]) is True
+    assert representation.contains_trait_by_id(FileLocation.id) is True
+    assert representation.contains_traits_by_id(
+        trait_ids=[FileLocation.id, Image.id]) is True
+
+    assert representation.contains_trait(trait=Bundle) is False
+    assert representation.contains_traits([Image, Bundle]) is False
+    assert representation.contains_trait_by_id(Bundle.id) is False
+    assert representation.contains_traits_by_id(
+        trait_ids=[FileLocation.id, Bundle.id]) is False
+
+
+def test_trait_removing(representation: Representation) -> None:
+    """Test removing traits."""
+    assert representation.contains_trait_by_id("nonexistent") is False
+    with pytest.raises(
+            ValueError, match=r"Trait with ID nonexistent not found."):
+        representation.remove_trait_by_id("nonexistent")
+
+    assert representation.contains_trait(trait=FileLocation) is True
+    representation.remove_trait(trait=FileLocation)
+    assert representation.contains_trait(trait=FileLocation) is False
+
+    assert representation.contains_trait_by_id(Image.id) is True
+    representation.remove_trait_by_id(Image.id)
+    assert representation.contains_trait_by_id(Image.id) is False
+
+    assert representation.contains_traits([PixelBased, Planar]) is True
+    representation.remove_traits([Planar, PixelBased])
+    assert representation.contains_traits([PixelBased, Planar]) is False
+
+    assert representation.has_traits() is False
+
+    with pytest.raises(
+            ValueError, match=f"Trait with ID {Image.id} not found."):
+        representation.remove_trait(Image)
+
+
+def test_representation_dict_properties(
+        representation: Representation) -> None:
+    """Test representation as dictionary."""
+    representation = Representation(name="test")
+    representation[Image.id] = Image()
+    assert Image.id in representation
+    image = representation[Image.id]
+    assert image == Image()
+    for trait_id, trait in representation.items():
+        assert trait_id == Image.id
+        assert trait == Image()
+
+
+def test_getting_traits_data(representation: Representation) -> None:
+    """Test getting a batch of traits."""
+    result = representation.get_traits_by_ids(
+        trait_ids=[FileLocation.id, Image.id, PixelBased.id, Planar.id])
+    assert result == {
+         "ayon.2d.Image.v1": Image(),
+         "ayon.2d.PixelBased.v1": PixelBased(
+             display_window_width=1920,
+             display_window_height=1080,
+             pixel_aspect_ratio=1.0),
+         "ayon.2d.Planar.v1": Planar(planar_configuration="RGB"),
+         "ayon.content.FileLocation.v1": FileLocation(
+             file_path=Path("/path/to/file"),
+             file_size=1024,
+             file_hash=None)
+    }
+
+
+def test_traits_data_to_dict(representation: Representation) -> None:
+    """Test converting traits data to dictionary."""
+    result = representation.traits_as_dict()
+    assert result == REPRESENTATION_DATA
+
+
+def test_get_version_from_id() -> None:
+    """Test getting version from trait ID."""
+    assert Image().get_version() == 1
+
+    class TestOverscan(Overscan):
+        id = "ayon.2d.Overscan.v2"
+
+    assert TestOverscan(
+        left=0,
+        right=0,
+        top=0,
+        bottom=0
+    ).get_version() == 2
+
+    class TestMimeType(MimeType):
+        id = "ayon.content.MimeType"
+
+    assert TestMimeType(mime_type="foo/bar").get_version() is None
+
+
+def test_get_versionless_id() -> None:
+    """Test getting versionless trait ID."""
+    assert Image().get_versionless_id() == "ayon.2d.Image"
+
+    class TestOverscan(Overscan):
+        id = "ayon.2d.Overscan.v2"
+
+    assert TestOverscan(
+        left=0,
+        right=0,
+        top=0,
+        bottom=0
+    ).get_versionless_id() == "ayon.2d.Overscan"
+
+    class TestMimeType(MimeType):
+        id = "ayon.content.MimeType"
+
+    assert TestMimeType(mime_type="foo/bar").get_versionless_id() == \
+           "ayon.content.MimeType"
+
+
+def test_from_dict() -> None:
+    """Test creating representation from dictionary."""
+    traits_data = {
+        "ayon.content.FileLocation.v1": {
+            "file_path": "/path/to/file",
+            "file_size": 1024,
+            "file_hash": None,
+        },
+        "ayon.2d.Image.v1": {},
+    }
+
+    representation = Representation.from_dict(
+        "test", trait_data=traits_data)
+
+    assert len(representation) == 2
+    assert representation.get_trait_by_id("ayon.content.FileLocation.v1")
+    assert representation.get_trait_by_id("ayon.2d.Image.v1")
+
+    traits_data = {
+        "ayon.content.FileLocation.v999": {
+            "file_path": "/path/to/file",
+            "file_size": 1024,
+            "file_hash": None,
+        },
+    }
+
+    with pytest.raises(ValueError, match=r"Trait model with ID .* not found."):
+        representation = Representation.from_dict(
+            "test", trait_data=traits_data)
+
+    traits_data = {
+        "ayon.content.FileLocation": {
+            "file_path": "/path/to/file",
+            "file_size": 1024,
+            "file_hash": None,
+        },
+    }
+
+    representation = Representation.from_dict(
+        "test", trait_data=traits_data)
+
+    assert len(representation) == 1
+    assert representation.get_trait_by_id("ayon.content.FileLocation.v1")
+
+    # this won't work right now because we would need to somewhat mock
+    # the import
+    """
+    from .lib import NewTestTrait
+
+    traits_data = {
+        "ayon.test.NewTestTrait.v1": {},
+    }
+
+    representation = Representation.from_dict(
+        "test", trait_data=traits_data)
+    """
+
+
+def test_representation_equality() -> None:
+    """Test representation equality."""
+    # rep_a and rep_b are equal
+    rep_a = Representation(name="test", traits=[
+        FileLocation(file_path=Path("/path/to/file"), file_size=1024),
+        Image(),
+        PixelBased(
+            display_window_width=1920,
+            display_window_height=1080,
+            pixel_aspect_ratio=1.0),
+        Planar(planar_configuration="RGB"),
+    ])
+    rep_b = Representation(name="test", traits=[
+        FileLocation(file_path=Path("/path/to/file"), file_size=1024),
+        Image(),
+        PixelBased(
+            display_window_width=1920,
+            display_window_height=1080,
+            pixel_aspect_ratio=1.0),
+        Planar(planar_configuration="RGB"),
+    ])
+
+    # rep_c has different value for planar_configuration then rep_a and rep_b
+    rep_c = Representation(name="test", traits=[
+        FileLocation(file_path=Path("/path/to/file"), file_size=1024),
+        Image(),
+        PixelBased(
+            display_window_width=1920,
+            display_window_height=1080,
+            pixel_aspect_ratio=1.0),
+        Planar(planar_configuration="RGBA"),
+    ])
+
+    rep_d = Representation(name="test", traits=[
+        FileLocation(file_path=Path("/path/to/file"), file_size=1024),
+        Image(),
+    ])
+    rep_e = Representation(name="foo", traits=[
+        FileLocation(file_path=Path("/path/to/file"), file_size=1024),
+        Image(),
+    ])
+    rep_f = Representation(name="foo", traits=[
+        FileLocation(file_path=Path("/path/to/file"), file_size=1024),
+        Planar(planar_configuration="RGBA"),
+    ])
+
+    # let's assume ids are the same (because ids are randomly generated)
+    rep_b.representation_id = rep_d.representation_id = rep_a.representation_id
+    rep_c.representation_id = rep_e.representation_id = rep_a.representation_id
+    rep_f.representation_id = rep_a.representation_id
+    assert rep_a == rep_b
+
+    # because of the trait value difference
+    assert rep_a != rep_c
+    # because of the type difference
+    assert rep_a != "foo"
+    # because of the trait count difference
+    assert rep_a != rep_d
+    # because of the name difference
+    assert rep_d != rep_e
+    # because of the trait difference
+    assert rep_d != rep_f
+
+
+def test_get_repre_by_name():
+    """Test getting representation by name."""
+    rep_a = Representation(name="test_a", traits=[
+        FileLocation(file_path=Path("/path/to/file"), file_size=1024),
+        Image(),
+        PixelBased(
+            display_window_width=1920,
+            display_window_height=1080,
+            pixel_aspect_ratio=1.0),
+        Planar(planar_configuration="RGB"),
+    ])
+    rep_b = Representation(name="test_b", traits=[
+        FileLocation(file_path=Path("/path/to/file"), file_size=1024),
+        Image(),
+        PixelBased(
+            display_window_width=1920,
+            display_window_height=1080,
+            pixel_aspect_ratio=1.0),
+        Planar(planar_configuration="RGB"),
+    ])
+
+    representations = [rep_a, rep_b]
+    _ = next(rep for rep in representations if rep.name == "test_a")

tests/client/ayon_core/pipeline/traits/test_two_dimensional_traits.py

@@ -0,0 +1,63 @@
+"""Tests for the 2d related traits."""
+from __future__ import annotations
+
+from pathlib import Path
+
+from ayon_core.pipeline.traits import (
+    UDIM,
+    FileLocation,
+    FileLocations,
+    Representation,
+)
+
+
+def test_get_file_location_for_udim() -> None:
+    """Test get_file_location_for_udim."""
+    file_locations_list = [
+        FileLocation(
+            file_path=Path("/path/to/file.1001.exr"),
+            file_size=1024,
+            file_hash=None,
+        ),
+        FileLocation(
+            file_path=Path("/path/to/file.1002.exr"),
+            file_size=1024,
+            file_hash=None,
+        ),
+        FileLocation(
+            file_path=Path("/path/to/file.1003.exr"),
+            file_size=1024,
+            file_hash=None,
+        ),
+    ]
+
+    representation = Representation(name="test_1", traits=[
+        FileLocations(file_paths=file_locations_list),
+        UDIM(udim=[1001, 1002, 1003]),
+    ])
+
+    udim_trait = representation.get_trait(UDIM)
+    assert udim_trait.get_file_location_for_udim(
+        file_locations=representation.get_trait(FileLocations),
+        udim=1001
+    ) == file_locations_list[0]
+
+
+def test_get_udim_from_file_location() -> None:
+    """Test get_udim_from_file_location."""
+    file_location_1 = FileLocation(
+        file_path=Path("/path/to/file.1001.exr"),
+        file_size=1024,
+        file_hash=None,
+    )
+
+    file_location_2 = FileLocation(
+        file_path=Path("/path/to/file.xxxxx.exr"),
+        file_size=1024,
+        file_hash=None,
+    )
+    assert UDIM(udim=[1001]).get_udim_from_file_location(
+        file_location_1) == 1001
+
+    assert UDIM(udim=[1001]).get_udim_from_file_location(
+        file_location_2) is None

tests/client/ayon_core/plugins/publish/test_integrate_traits.py

@@ -0,0 +1,451 @@
+"""Tests for the representation traits."""
+from __future__ import annotations
+
+import base64
+import re
+import time
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+import pyblish.api
+import pytest
+
+from ayon_core.lib.file_transaction import (
+    FileTransaction,
+)
+
+from ayon_core.pipeline.anatomy import Anatomy
+from ayon_core.pipeline.traits import (
+    Bundle,
+    FileLocation,
+    FileLocations,
+    FrameRanged,
+    Image,
+    MimeType,
+    Persistent,
+    PixelBased,
+    Representation,
+    Sequence,
+    Transient,
+)
+from ayon_core.pipeline.version_start import get_versioning_start
+
+# Tagged,
+# TemplatePath,
+from ayon_core.plugins.publish.integrate_traits import (
+    IntegrateTraits,
+    TransferItem,
+)
+
+from ayon_core.settings import get_project_settings
+
+from ayon_api.operations import (
+    OperationsSession,
+)
+
+if TYPE_CHECKING:
+    import pytest_ayon
+
+PNG_FILE_B64 = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQAAAAA3bvkkAAAACklEQVR4AWNgAAAAAgABc3UBGAAAAABJRU5ErkJggg=="  # noqa: E501
+SEQUENCE_LENGTH = 10
+CURRENT_TIME = time.time()
+
+
+@pytest.fixture(scope="session")
+def single_file(tmp_path_factory: pytest.TempPathFactory) -> Path:
+    """Return a temporary image file."""
+    filename = tmp_path_factory.mktemp("single") / "img.png"
+    filename.write_bytes(base64.b64decode(PNG_FILE_B64))
+    return filename
+
+
+@pytest.fixture(scope="session")
+def sequence_files(tmp_path_factory: pytest.TempPathFactory) -> list[Path]:
+    """Return a sequence of temporary image files."""
+    files = []
+    dir_name = tmp_path_factory.mktemp("sequence")
+    for i in range(SEQUENCE_LENGTH):
+        frame = i + 1
+        filename = dir_name / f"img.{frame:04d}.png"
+        filename.write_bytes(base64.b64decode(PNG_FILE_B64))
+        files.append(filename)
+    return files
+
+
+@pytest.fixture
+def mock_context(
+        project: pytest_ayon.ProjectInfo,
+        single_file: Path,
+        sequence_files: list[Path]) -> pyblish.api.Context:
+    """Return a mock instance.
+
+    This is mocking pyblish context for testing. It is using real AYON project
+    thanks to the ``project`` fixture.
+
+    Args:
+        project (object): The project info. It is `ProjectInfo` object
+            returned by pytest fixture.
+        single_file (Path): The path to a single image file.
+        sequence_files (list[Path]): The paths to a sequence of image files.
+
+    """
+    anatomy = Anatomy(project.project_name)
+    context = pyblish.api.Context()
+    context.data["projectName"] = project.project_name
+    context.data["hostName"] = "test_host"
+    context.data["project_settings"] = get_project_settings(
+        project.project_name)
+    context.data["anatomy"] = anatomy
+    context.data["time"] = CURRENT_TIME
+    context.data["user"] = "test_user"
+    context.data["machine"] = "test_machine"
+    context.data["fps"] = 25
+
+    instance = context.create_instance("mock_instance")
+    instance.data["source"] = "test_source"
+    instance.data["families"] = ["render"]
+
+    parents = project.folder_entity["path"].lstrip("/").split("/")
+    hierarchy = "/".join(parents) if parents else ""
+
+    instance.data["anatomyData"] = {
+        "project": {
+            "name": project.project_name,
+            "code": project.project_code
+        },
+        "task": {
+            "name": project.task.name,
+            "type": "test"  # pytest-ayon doesn't return the task type yet
+        },
+        "folder": {
+            "name": project.folder.name,
+            "type": "test"  # pytest-ayon doesn't return the folder type yet
+        },
+        "product": {
+            "name": project.product.name,
+            "type": "test"  # pytest-ayon doesn't return the product type yet
+        },
+        "hierarchy": hierarchy,
+
+    }
+    instance.data["folderEntity"] = project.folder_entity
+    instance.data["productType"] = "test_product"
+    instance.data["productName"] = project.product.name
+    instance.data["anatomy"] = anatomy
+    instance.data["comment"] = "test_comment"
+
+    instance.data["integrate"] = True
+    instance.data["farm"] = False
+
+    parents = project.folder_entity["path"].lstrip("/").split("/")
+
+    hierarchy = "/".join(parents) if parents else ""
+    instance.data["hierarchy"] = hierarchy
+
+    version_number = get_versioning_start(
+        context.data["projectName"],
+        instance.context.data["hostName"],
+        task_name=project.task.name,
+        task_type="test",
+        product_type=instance.data["productType"],
+        product_name=instance.data["productName"]
+    )
+
+    instance.data["version"] = version_number
+
+    file_size = len(base64.b64decode(PNG_FILE_B64))
+    file_locations = [
+        FileLocation(
+            file_path=f,
+            file_size=file_size)
+        for f in sequence_files]
+
+    instance.data["representations_with_traits"] = [
+        Representation(name="test_single", traits=[
+            Persistent(),
+            FileLocation(
+                file_path=single_file,
+                file_size=len(base64.b64decode(PNG_FILE_B64))),
+            Image(),
+            MimeType(mime_type="image/png"),
+        ]),
+        Representation(name="test_sequence", traits=[
+            Persistent(),
+            FrameRanged(
+                frame_start=1,
+                frame_end=SEQUENCE_LENGTH,
+                frame_in=0,
+                frame_out=SEQUENCE_LENGTH - 1,
+                frames_per_second="25",
+            ),
+            Sequence(
+                frame_padding=4,
+                frame_regex=re.compile(
+                    r"img\.(?P<index>(?P<padding>0*)\d{4})\.png$"),
+            ),
+            FileLocations(
+                file_paths=file_locations,
+            ),
+            Image(),
+            PixelBased(
+                display_window_width=1920,
+                display_window_height=1080,
+                pixel_aspect_ratio=1.0),
+            MimeType(mime_type="image/png"),
+        ]),
+        Representation(name="test_bundle", traits=[
+            Persistent(),
+            Bundle(
+                items=[
+                    [
+                        FileLocation(
+                            file_path=single_file,
+                            file_size=len(base64.b64decode(PNG_FILE_B64))),
+                        Image(),
+                        MimeType(mime_type="image/png"),
+                    ],
+                    [
+                        Persistent(),
+                        FrameRanged(
+                            frame_start=1,
+                            frame_end=SEQUENCE_LENGTH,
+                            frame_in=0,
+                            frame_out=SEQUENCE_LENGTH - 1,
+                            frames_per_second="25",
+                        ),
+                        Sequence(
+                            frame_padding=4,
+                            frame_regex=re.compile(
+                                r"img\.(?P<index>(?P<padding>0*)\d{4})\.png$"),
+                        ),
+                        FileLocations(
+                            file_paths=file_locations,
+                        ),
+                        Image(),
+                        PixelBased(
+                            display_window_width=1920,
+                            display_window_height=1080,
+                            pixel_aspect_ratio=1.0),
+                        MimeType(mime_type="image/png"),
+                    ],
+                ],
+            ),
+        ]),
+    ]
+
+    return context
+
+
+@pytest.mark.server
+def test_get_template_name(mock_context: pyblish.api.Context) -> None:
+    """Test get_template_name.
+
+    TODO (antirotor): this will always return "default" probably, if
+        there are no studio overrides. To test this properly, we need
+        to set up the studio overrides in the test environment.
+
+    """
+    integrator = IntegrateTraits()
+    template_name = integrator.get_template_name(
+        mock_context[0])
+
+    assert template_name == "default"
+
+
+class TestGetSize:
+    @staticmethod
+    def get_size(file_path: Path) -> int:
+        """Get size of the file.
+
+        Args:
+            file_path (Path): File path.
+
+        Returns:
+            int: Size of the file.
+
+        """
+        return file_path.stat().st_size
+
+    @pytest.mark.parametrize(
+        "file_path, expected_size",
+        [
+            (Path("./test_file_1.txt"), 10),  # id: happy_path_small_file
+            (Path("./test_file_2.txt"), 1024),  # id: happy_path_medium_file
+            (Path("./test_file_3.txt"), 10485760)  # id: happy_path_large_file
+        ],
+        ids=["happy_path_small_file",
+             "happy_path_medium_file",
+             "happy_path_large_file"]
+    )
+    def test_get_size_happy_path(
+            self, file_path: Path, expected_size: int, tmp_path: Path):
+        # Arrange
+        file_path = tmp_path / file_path
+        file_path.write_bytes(b"\0" * expected_size)
+
+        # Act
+        size = self.get_size(file_path)
+
+        # Assert
+        assert size == expected_size
+
+    @pytest.mark.parametrize(
+        "file_path, expected_size",
+        [
+            (Path("./test_file_empty.txt"), 0)  # id: edge_case_empty_file
+        ],
+        ids=["edge_case_empty_file"]
+    )
+    def test_get_size_edge_cases(
+            self, file_path: Path, expected_size: int, tmp_path: Path):
+        # Arrange
+        file_path = tmp_path / file_path
+        file_path.touch()  # Create an empty file
+
+        # Act
+        size = self.get_size(file_path)
+
+        # Assert
+        assert size == expected_size
+
+    @pytest.mark.parametrize(
+        "file_path, expected_exception",
+        [
+            (
+                    Path("./non_existent_file.txt"),
+                    FileNotFoundError
+            ),  # id: error_file_not_found
+            (123, TypeError)  # id: error_invalid_input_type
+        ],
+        ids=["error_file_not_found", "error_invalid_input_type"]
+    )
+    def test_get_size_error_cases(
+            self, file_path, expected_exception, tmp_path):
+
+        # Act & Assert
+        with pytest.raises(expected_exception):
+            file_path = tmp_path / file_path
+            self.get_size(file_path)
+
+
+def test_filter_lifecycle() -> None:
+    """Test filter_lifecycle."""
+    integrator = IntegrateTraits()
+    persistent_representation = Representation(
+        name="test",
+        traits=[
+                Persistent(),
+                FileLocation(
+                    file_path=Path("test"),
+                    file_size=1234),
+                Image(),
+                MimeType(mime_type="image/png"),
+            ])
+    transient_representation = Representation(
+        name="test",
+        traits=[
+                Transient(),
+                Image(),
+                MimeType(mime_type="image/png"),
+            ])
+    filtered = integrator.filter_lifecycle(
+        [persistent_representation, transient_representation])
+
+    assert len(filtered) == 1
+    assert filtered[0] == persistent_representation
+
+
+@pytest.mark.server
+def test_prepare_product(
+        project: pytest_ayon.ProjectInfo,
+        mock_context: pyblish.api.Context) -> None:
+    """Test prepare_product."""
+    integrator = IntegrateTraits()
+    op_session = OperationsSession()
+    product = integrator.prepare_product(mock_context[0], op_session)
+
+    assert product == {
+        "attrib": {},
+        "data": {
+            "families": ["default", "render"],
+            },
+        "folderId": project.folder_entity["id"],
+        "name": "renderMain",
+        "productType": "test_product",
+        "id": project.product_entity["id"],
+        }
+
+
+@pytest.mark.server
+def test_prepare_version(
+        project: pytest_ayon.ProjectInfo,
+        mock_context: pyblish.api.Context) -> None:
+    """Test prepare_version."""
+    integrator = IntegrateTraits()
+    op_session = OperationsSession()
+    product = integrator.prepare_product(mock_context[0], op_session)
+    version = integrator.prepare_version(
+        mock_context[0], op_session, product)
+
+    assert version == {
+        "attrib": {
+            "comment": "test_comment",
+            "families": ["default", "render"],
+            "fps": 25,
+            "machine": "test_machine",
+            "source": "test_source",
+        },
+        "data": {
+            "author": "test_user",
+            "time": CURRENT_TIME,
+        },
+        "id": project.version_entity["id"],
+        "productId": project.product_entity["id"],
+        "version": 1,
+    }
+
+
+@pytest.mark.server
+def test_get_transfers_from_representation(
+        mock_context: pyblish.api.Context) -> None:
+    """Test get_transfers_from_representation.
+
+    This tests getting actual transfers from the representations and
+    also the legacy files.
+
+    Todo: This test will benefit massively from a proper mocking of the
+        context. We need to parametrize the test with different
+        representations and test the output of the function.
+
+    """
+    integrator = IntegrateTraits()
+
+    instance = mock_context[0]
+    representations: list[Representation] = instance.data[
+        "representations_with_traits"]
+    transfers = integrator.get_transfers_from_representations(
+        instance, representations)
+
+    assert len(representations) == 3
+    assert len(transfers) == 22
+
+    for transfer in transfers:
+        assert transfer.checksum == TransferItem.get_checksum(
+            transfer.source)
+
+    file_transactions = FileTransaction(
+        # Enforce unique transfers
+        allow_queue_replacements=False)
+
+    for transfer in transfers:
+        file_transactions.add(
+            transfer.source.as_posix(),
+            transfer.destination.as_posix(),
+            mode=FileTransaction.MODE_COPY,
+        )
+
+    file_transactions.process()
+
+    for representation in representations:
+        _ = integrator._get_legacy_files_for_representation(  # noqa: SLF001
+            transfers, representation, anatomy=instance.data["anatomy"])

tests/conftest.py

@@ -1,3 +1,4 @@
+"""conftest.py: pytest configuration file."""
 import sys
 from pathlib import Path
 
@@ -5,5 +6,3 @@ client_path = Path(__file__).resolve().parent.parent / "client"
 
 # add client path to sys.path
 sys.path.append(str(client_path))
-
-print(f"Added {client_path} to sys.path")

tools/manage.ps1

@@ -242,7 +242,7 @@ function Run-From-Code {
 
 function Run-Tests {
     $Poetry = "$RepoRoot\.poetry\bin\poetry.exe"
-    $RunArgs = @( "run", "pytest", "$($RepoRoot)/tests")
+    $RunArgs = @( "run", "pytest", "$($RepoRoot)/tests", "-m",  "not server")
 
     & $Poetry $RunArgs @arguments
 }

tools/manage.sh

@@ -186,7 +186,7 @@ run_command () {
 run_tests () {
   echo -e "${BIGreen}>>>${RST} Running tests..."
   shift;  # will remove first arg ("run-tests") from the "$@"
-  "$POETRY_HOME/bin/poetry" run pytest ./tests
+  "$POETRY_HOME/bin/poetry" run pytest ./tests -m "not server"
 }
 
 main () {