Introduce a ExtensiblePolymorphicModel

CHANGELOG.rst

@@ -13,6 +13,7 @@ Added
 ~~~~~
 
 * Allow apps to dynamically generate OAuth scopes
+* Provide a ``ExtensiblePolymorphicModel`` to support the features of extensible models for polymorphic models and vice-versa.
 
 Removed
 ~~~~~~~

aleksis/core/managers.py

@@ -120,3 +120,7 @@ class InstalledWidgetsDashboardWidgetOrderManager(Manager):
 
         # [obj["id"] for obj in list(Person.objects.all().values("id"))]
         return super().get_queryset().filter(widget_id__in=dashboard_widget_pks)
+
+
+class PolymorphicCurrentSiteManager(_CurrentSiteManager, PolymorphicManager):
+    """Default manager for extensible, polymorphic models."""

aleksis/core/mixins.py

@@ -24,9 +24,16 @@ from guardian.admin import GuardedModelAdmin
 from guardian.core import ObjectPermissionChecker
 from jsonstore.fields import IntegerField, JSONFieldMixin
 from material.base import Layout, LayoutNode
+from polymorphic.base import PolymorphicModelBase
+from polymorphic.managers import PolymorphicManager
+from polymorphic.models import PolymorphicModel
 from rules.contrib.admin import ObjectPermissionsModelAdmin
 
-from aleksis.core.managers import CurrentSiteManagerWithoutMigrations, SchoolTermRelatedQuerySet
+from aleksis.core.managers import (
+    CurrentSiteManagerWithoutMigrations,
+    PolymorphicCurrentSiteManager,
+    SchoolTermRelatedQuerySet,
+)
 
 
 class _ExtensibleModelBase(models.base.ModelBase):
@@ -351,6 +358,22 @@ class ExtensibleModel(models.Model, metaclass=_ExtensibleModelBase):
         abstract = True
 
 
+class _ExtensiblePolymorphicModelBase(_ExtensibleModelBase, PolymorphicModelBase):
+    """Base class for extensible, polymorphic models."""
+
+
+class ExtensiblePolymorphicModel(
+    ExtensibleModel, PolymorphicModel, metaclass=_ExtensiblePolymorphicModelBase
+):
+    """Model class for extensible, polymorphic models."""
+
+    objects = PolymorphicCurrentSiteManager()
+    objects_all_sites = PolymorphicManager()
+
+    class Meta:
+        abstract = True
+
+
 class PureDjangoModel(object):
     """No-op mixin to mark a model as deliberately not using ExtensibleModel."""