Ticket #12567: 12567.diff

django/db/models/sql/query.py

@@ -1006 +1006 @@
                     can_reuse)
             return
 
-        if (lookup_type == 'isnull' and value is True and not negate and
-                len(join_list) > 1):
+        if (lookup_type == 'isnull' and not negate and len(join_list) > 1):
             # If the comparison is against NULL, we may need to use some left
             # outer joins when creating the join chain. This is only done when
             # needed, as it's less efficient at the database level.

tests/regressiontests/model_inheritance_regress/models.py

@@ -6 +6 @@
 
 from django.db import models
 
-# Python 2.3 doesn't have sorted()
-try:
-    sorted
-except NameError:
-    from django.utils.itercompat import sorted
 
 class Place(models.Model):
     name = models.CharField(max_length=50)
@@ -385 +380 @@
 >>> p4.bachelorparty_set.all()
 [<BachelorParty: Bachelor party for Bob>, <BachelorParty: Bachelor party for Dave>]
 
-"""}
+# This works
+>>> Place.objects.exclude(restaurant=None)
+[<Place:  the place>]
 
+# ... and this doesn't.
+>>> Place.objects.filter(restaurant__isnull=False)
+[<Place:  the place>]
+"""}