Ticket #12132: patch.diff

django/db/models/base.py

@@ -641 +641 @@
         # the list of checks. Again, skip empty fields and any that did not validate.
         for f in self._meta.fields:
             name = f.name
-            if f.unique:
+            if f.unique and not f.primary_key:
                 unique_checks.append((name,))
             if f.unique_for_date:
                 date_checks.append(('date', name, f.unique_for_date))