Fixed #10827 -- Ensured ContentTypes are created before permission creation.

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/auth_tests/test_management.py b/tests/auth_tests/test_management.py
index 4f29740982..73cf66699b 100644
--- a/tests/auth_tests/test_management.py
+++ b/tests/auth_tests/test_management.py
@@ -838,3 +838,15 @@ class CreatePermissionsTests(TestCase):
         state = migrations.state.ProjectState(real_apps=['contenttypes'])
         with self.assertNumQueries(0):
             create_permissions(self.app_config, verbosity=0, apps=state.apps)
+
+    def test_create_permissions_checks_contenttypes_created(self):
+        """
+        `post_migrate` handler ordering isn't guaranteed. Simulate a case
+        where create_permissions() is called before create_contenttypes().
+        """
+        # Warm the manager cache.
+        ContentType.objects.get_for_model(Group)
+        # Apply a deletion as if e.g. a database 'flush' had been executed.
+        ContentType.objects.filter(app_label='auth', model='group').delete()
+        # This fails with a foreign key constraint without the fix.
+        create_permissions(apps.get_app_config('auth'), interactive=False, verbosity=0)