Merged custom_managers_regress into the custom_managers test package.

tests/custom_managers/tests.py

@@ -3,7 +3,8 @@ from __future__ import unicode_literals
 from django.test import TestCase
 from django.utils import six
 
-from .models import Person, FunPerson, Book, Car, PersonManager, PublishedBookManager
+from .models import (Book, Car, FunPerson, OneToOneRestrictedModel, Person,
+    PersonManager, PublishedBookManager, RelatedModel, RestrictedModel)
 
 
 class CustomManagerTests(TestCase):
@@ -463,3 +464,47 @@ class CustomManagerTests(TestCase):
             lambda c: c.first_name,
             ordered=False,
         )
+
+
+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)