Send post_delete signals immediately

In a normal relational construct, if you're listening for an event
that signals a child was deleted, you dont expect that the parent
was deleted already.

This change ensures that post_delete signals are fired immediately
after objects are deleted in the graph.

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/modeltests/delete/tests.py b/tests/modeltests/delete/tests.py
index 20b815c33d..5d7b7a0b33 100644
--- a/tests/modeltests/delete/tests.py
+++ b/tests/modeltests/delete/tests.py
@@ -229,6 +229,18 @@ class DeletionTests(TestCase):
         models.signals.post_delete.disconnect(log_post_delete)
         models.signals.post_delete.disconnect(log_pre_delete)
 
+    def test_relational_post_delete_signals_happen_before_parent_object(self):
+        def log_post_delete(instance, **kwargs):
+            self.assertTrue(R.objects.filter(pk=instance.r_id))
+
+        models.signals.post_delete.connect(log_post_delete, sender=S)
+
+        r = R.objects.create(pk=1)
+        S.objects.create(pk=1, r=r)
+        r.delete()
+
+        models.signals.post_delete.disconnect(log_post_delete)
+
     @skipUnlessDBFeature("can_defer_constraint_checks")
     def test_can_defer_constraint_checks(self):
         u = User.objects.create(