Fixed a bug with the new QuerySet update() method where it wasn't committing the…

Fixed a bug with the new QuerySet update() method where it wasn't committing the transaction (on Postgres, at least)

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7487 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -284,6 +284,7 @@ class QuerySet(object):
         query = self.query.clone(sql.UpdateQuery)
         query.add_update_values(kwargs)
         query.execute_sql(None)
+        transaction.commit_unless_managed()
         self._result_cache = None
     update.alters_data = True