Fixed #11283 -- Made sure that latest() clears previously specified ordering in…

Fixed #11283 -- Made sure that latest() clears previously specified ordering in a QuerySet. Thanks to benmoran, punteney, mk and and Julien Phalip.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16067 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -403,6 +403,7 @@ class QuerySet(object):
                 "Cannot change a query once a slice has been taken."
         obj = self._clone()
         obj.query.set_limits(high=1)
+        obj.query.clear_ordering()
         obj.query.add_ordering('-%s' % latest_by)
         return obj.get()
 

tests/modeltests/get_latest/tests.py

@@ -43,6 +43,9 @@ class LatestTests(TestCase):
             a3,
         )
 
+        # Ensure that latest() overrides any other ordering specified on the query. Refs #11283.
+        self.assertEqual(Article.objects.order_by('id').latest(), a4)
+
     def test_latest_manual(self):
         # You can still use latest() with a model that doesn't have
         # "get_latest_by" set -- just pass in the field name manually.