Ticket #15776: 15776.deletion_order.diff

django/db/models/deletion.py

@@ -237 +237 @@
                                    {field.name: value}, self.using)
 
         # reverse instance collections
-        for instances in self.data.itervalues():
-            instances.reverse()
+        self.data.keyOrder.reverse()
 
         # delete batches
         for model, batches in self.batches.iteritems():

tests/modeltests/delete/tests.py

@@ -206 +206 @@
         t2 = T.objects.create(pk=2, s=s2)
         r.delete()
         self.assertEqual(
-            pre_delete_order, [(T, 2), (T, 1), (S, 2), (S, 1), (R, 1)]
+            pre_delete_order, [(R, 1), (S, 1), (S, 2), (T, 1), (T, 2)]
         )
         self.assertEqual(
             post_delete_order, [(T, 1), (T, 2), (S, 1), (S, 2), (R, 1)]