diff -r 5ff1fc726848 -r c6bca38c1cbf parts/django/tests/regressiontests/custom_managers_regress/tests.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parts/django/tests/regressiontests/custom_managers_regress/tests.py	Sat Jan 08 11:20:57 2011 +0530
@@ -0,0 +1,47 @@
+from django.test import TestCase
+
+from models import RelatedModel, RestrictedModel, OneToOneRestrictedModel
+
+class CustomManagersRegressTestCase(TestCase):
+    def test_filtered_default_manager(self):
+        """Even though the default manager filters out some records,
+        we must still be able to save (particularly, save by updating
+        existing records) those filtered instances. This is a
+        regression test for #8990, #9527"""
+        related = RelatedModel.objects.create(name="xyzzy")
+        obj = RestrictedModel.objects.create(name="hidden", related=related)
+        obj.name = "still hidden"
+        obj.save()
+
+        # If the hidden object wasn't seen during the save process,
+        # there would now be two objects in the database.
+        self.assertEqual(RestrictedModel.plain_manager.count(), 1)
+
+    def test_delete_related_on_filtered_manager(self):
+        """Deleting related objects should also not be distracted by a
+        restricted manager on the related object. This is a regression
+        test for #2698."""
+        related = RelatedModel.objects.create(name="xyzzy")
+
+        for name, public in (('one', True), ('two', False), ('three', False)):
+            RestrictedModel.objects.create(name=name, is_public=public, related=related)
+
+        obj = RelatedModel.objects.get(name="xyzzy")
+        obj.delete()
+
+        # All of the RestrictedModel instances should have been
+        # deleted, since they *all* pointed to the RelatedModel. If
+        # the default manager is used, only the public one will be
+        # deleted.
+        self.assertEqual(len(RestrictedModel.plain_manager.all()), 0)
+
+    def test_delete_one_to_one_manager(self):
+        # The same test case as the last one, but for one-to-one
+        # models, which are implemented slightly different internally,
+        # so it's a different code path.
+        obj = RelatedModel.objects.create(name="xyzzy")
+        OneToOneRestrictedModel.objects.create(name="foo", is_public=False, related=obj)
+        obj = RelatedModel.objects.get(name="xyzzy")
+        obj.delete()
+        self.assertEqual(len(OneToOneRestrictedModel.plain_manager.all()), 0)
+