Fixed #36295, Refs #24305 -- Allowed overriding GenericForeignKey fields on abstract models.

tests/model_inheritance/test_abstract_inheritance.py

@@ -184,6 +184,32 @@ class AbstractInheritanceTests(SimpleTestCase):
             ExtendModelAbstract._meta.get_field("field"), GenericRelation
         )
 
+    def test_override_private_field_with_attr(self):
+        class AbstractBase(models.Model):
+            content_type = models.ForeignKey(
+                ContentType, on_delete=models.SET_NULL, null=True, blank=True
+            )
+            object_id = models.PositiveIntegerField(null=True, blank=True)
+            related_object = GenericForeignKey("content_type", "object_id")
+
+            class Meta:
+                abstract = True
+
+        class Descendant(AbstractBase):
+            related_object = None
+
+        class Mixin:
+            related_object = None
+
+        class MultiDescendant(Mixin, AbstractBase):
+            pass
+
+        with self.assertRaises(FieldDoesNotExist):
+            Descendant._meta.get_field("related_object")
+
+        with self.assertRaises(FieldDoesNotExist):
+            MultiDescendant._meta.get_field("related_object")
+
     def test_cannot_override_indirect_abstract_field(self):
         class AbstractBase(models.Model):
             name = models.CharField(max_length=30)