Refs #13203, #9501 -- Added a test for generic relations to child models.

Fixed in 97774429.

tests/generic_relations/models.py

@@ -114,6 +114,10 @@ class Rock(Mineral):
     tags = GenericRelation(TaggedItem)
 
 
+class ValuableRock(Mineral):
+    tags = GenericRelation(ValuableTaggedItem)
+
+
 class ManualPK(models.Model):
     id = models.IntegerField(primary_key=True)
     tags = GenericRelation(TaggedItem, related_query_name='manualpk')

tests/generic_relations/tests.py

@@ -12,7 +12,8 @@ from django.utils import six
 from .models import (
     AllowsNullGFK, Animal, Comparison, ConcreteRelatedModel,
     ForConcreteModelModel, ForProxyModelModel, Gecko, ManualPK, Mineral,
-    ProxyRelatedModel, Rock, TaggedItem, ValuableTaggedItem, Vegetable,
+    ProxyRelatedModel, Rock, TaggedItem, ValuableRock, ValuableTaggedItem,
+    Vegetable,
 )
 
 
@@ -400,6 +401,13 @@ class GenericRelationsTests(TestCase):
         )
         self.assertEqual(valuedtag.content_object, quartz)
 
+    def test_generic_relation_to_inherited_child(self):
+        # GenericRelations to models that use multi-table inheritance work.
+        granite = ValuableRock.objects.create(name='granite', hardness=5)
+        ValuableTaggedItem.objects.create(content_object=granite, tag="countertop", value=1)
+        granite.delete()  # deleting the rock should delete the related tag.
+        self.assertEqual(ValuableTaggedItem.objects.count(), 0)
+
     def test_generic_inline_formsets(self):
         GenericFormSet = generic_inlineformset_factory(TaggedItem, extra=1)
         formset = GenericFormSet()