Ticket #10967: simple-patch-in-save_base.diff

base.py

@@ -457 +457 @@
                 if (force_update or (not force_insert and
                         manager.filter(pk=pk_val).extra(select={'a': 1}).values('a').order_by())):
                     # It does already exist, so do an UPDATE.
-                    if force_update or non_pks:
+                    if force_update and non_pks:
                         values = [(f, None, (raw and getattr(self, f.attname) or f.pre_save(self, False))) for f in non_pks]
                         rows = manager.filter(pk=pk_val)._update(values)
                         if force_update and not rows: