Fixed #21961 -- Added support for database-level delete options for ForeignKey.

Thanks Simon Charette for pair programming.

Co-authored-by: Nick Stefan <NickStefan12@gmail.com>
Co-authored-by: Akash Kumar Sen <71623442+Akash-Kumar-Sen@users.noreply.github.com>
Co-authored-by: Simon Charette <charette.s@gmail.com>

tests/admin_utils/tests.py

@@ -26,7 +26,17 @@ from django.test.utils import isolate_apps
 from django.utils.formats import localize
 from django.utils.safestring import mark_safe
 
-from .models import Article, Car, Count, Event, EventGuide, Location, Site, Vehicle
+from .models import (
+    Article,
+    Car,
+    Cascade,
+    DBCascade,
+    Event,
+    EventGuide,
+    Location,
+    Site,
+    Vehicle,
+)
 
 
 class NestedObjectsTests(TestCase):
@@ -34,10 +44,12 @@ class NestedObjectsTests(TestCase):
     Tests for ``NestedObject`` utility collection.
     """
 
+    cascade_model = Cascade
+
     @classmethod
     def setUpTestData(cls):
         cls.n = NestedObjects(using=DEFAULT_DB_ALIAS)
-        cls.objs = [Count.objects.create(num=i) for i in range(5)]
+        cls.objs = [cls.cascade_model.objects.create(num=i) for i in range(5)]
 
     def _check(self, target):
         self.assertEqual(self.n.nested(lambda obj: obj.num), target)
@@ -103,6 +115,15 @@ class NestedObjectsTests(TestCase):
         n.collect([Vehicle.objects.first()])
 
 
+class DBNestedObjectsTests(NestedObjectsTests):
+    """
+    Exercise NestedObjectsTests but with a model that makes use of DB_CASCADE
+    instead of CASCADE to ensure proper collection of objects takes place.
+    """
+
+    cascade_model = DBCascade
+
+
 class UtilsTests(SimpleTestCase):
     empty_value = "-empty-"