Ticket #8291: 8291_2.patch

django/core/management/validation.py

@@ -259 +259 @@
                 # this format would be nice, but it's a little fiddly).
                 if '_' in field_name:
                     continue
-                try:
-                    opts.get_field(field_name, many_to_many=False)
-                except models.FieldDoesNotExist:
-                    e.add(opts, '"ordering" refers to "%s", a field that doesn\'t exist.' % field_name)
+                if field_name != 'pk':
+                        try:
+                            opts.get_field(field_name, many_to_many=False)
+                        except models.FieldDoesNotExist:
+                            e.add(opts, '"ordering" refers to "%s", a field that doesn\'t exist.' % field_name)
 
         # Check unique_together.
         for ut in opts.unique_together:

tests/modeltests/ordering/models.py

@@ -23 +23 @@
 
     def __unicode__(self):
         return self.headline
+        
 
+class PkOrdering(models.Model):
+        
+        class Meta:
+                ordering = ('pk',)
+
+
 __test__ = {'API_TESTS':"""
 # Create a couple of Articles.
 >>> from datetime import datetime