Fixed #20883 -- Made model inheritance find parent links in abstract parents

2 files changed, 28 insertions, 1 deletions

diff --git a/tests/model_inheritance_regress/models.py b/tests/model_inheritance_regress/models.py
index 811c8175bb..0f45a2cb3f 100644
--- a/tests/model_inheritance_regress/models.py
+++ b/tests/model_inheritance_regress/models.py
@@ -50,6 +50,19 @@ class ParkingLot3(Place):
     primary_key = models.AutoField(primary_key=True)
     parent = models.OneToOneField(Place, parent_link=True)
 
+class ParkingLot4(models.Model):
+    # Test parent_link connector can be discovered in abstract classes.
+    parent = models.OneToOneField(Place, parent_link=True)
+
+    class Meta:
+        abstract = True
+
+class ParkingLot4A(ParkingLot4, Place):
+    pass
+
+class ParkingLot4B(Place, ParkingLot4):
+    pass
+
 class Supplier(models.Model):
     restaurant = models.ForeignKey(Restaurant)
 
diff --git a/tests/model_inheritance_regress/tests.py b/tests/model_inheritance_regress/tests.py
index 10a1230685..7f78fc7a98 100644
--- a/tests/model_inheritance_regress/tests.py
+++ b/tests/model_inheritance_regress/tests.py
@@ -14,7 +14,8 @@ from .models import (Place, Restaurant, ItalianRestaurant, ParkingLot,
     ParkingLot2, ParkingLot3, Supplier, Wholesaler, Child, SelfRefParent,
     SelfRefChild, ArticleWithAuthor, M2MChild, QualityControl, DerivedM,
     Person, BirthdayParty, BachelorParty, MessyBachelorParty,
-    InternalCertificationAudit, BusStation, TrainStation, User, Profile)
+    InternalCertificationAudit, BusStation, TrainStation, User, Profile,
+    ParkingLot4A, ParkingLot4B)
 
 
 class ModelInheritanceTest(TestCase):
@@ -311,6 +312,19 @@ class ModelInheritanceTest(TestCase):
             ParkingLot3._meta.get_ancestor_link(Place).name,
             "parent")
 
+    def test_use_explicit_o2o_to_parent_from_abstract_model(self):
+        self.assertEqual(ParkingLot4A._meta.pk.name, "parent")
+        ParkingLot4A.objects.create(
+            name="Parking4A",
+            address='21 Jump Street',
+        )
+
+        self.assertEqual(ParkingLot4B._meta.pk.name, "parent")
+        ParkingLot4A.objects.create(
+            name="Parking4B",
+            address='21 Jump Street',
+        )
+
     def test_all_fields_from_abstract_base_class(self):
         """
         Regression tests for #7588