Fixed #9989: fixed a subtle edge case where removing signals could break. Thanks, ferringb.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10398 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/dispatch/dispatcher.py

@@ -119,10 +119,11 @@ class Signal(object):
             lookup_key = (dispatch_uid, _make_id(sender))
         else:
             lookup_key = (_make_id(receiver), _make_id(sender))
-
-        for idx, (r_key, _) in enumerate(self.receivers):
+        
+        for index in xrange(len(self.receivers)):
+            (r_key, _) = self.receivers[index]
             if r_key == lookup_key:
-                del self.receivers[idx]
+                del self.receivers[index]
 
     def send(self, sender, **named):
         """Send signal from sender to all connected receivers.

tests/modeltests/signals/models.py

@@ -96,4 +96,15 @@ instance.id is None: False
 >>> models.signals.pre_delete.disconnect(pre_delete_test)
 >>> models.signals.post_save.disconnect(post_save_test)
 >>> models.signals.pre_save.disconnect(pre_save_test)
+
+# Make sure all the signals got removed properly (#9989)
+>>> models.signals.post_delete.receivers
+[]
+>>> models.signals.pre_delete.receivers
+[]
+>>> models.signals.post_save.receivers
+[]
+>>> models.signals.pre_save.receivers
+[]
+
 """}