Ticket #1334: manipulators.patch

fields/related.py

@@ -127 +127 @@
         (rel_col_name, join_table, this_col_name,
         rel_col_name, ",".join(['%s'] * len(new_ids))), 
         [this_pk_val] + list(new_ids))
-    existing_ids = set([row[0] for row in cursor.fetchmany(rowcount)])
+    if rowcount:
+        existing_ids = set([row[0] for row in cursor.fetchmany(rowcount)])
+    else:
+        existing_ids = set()
 
     # Add the ones that aren't there already
     for obj_id in (new_ids - existing_ids):

manipulators.py

@@ -119 +119 @@
                         new_vals = new_data.get(f.name, ())
                     else:
                         new_vals = new_data.getlist(f.name)
-                    was_changed = getattr(new_object, 'set_%s' % f.name)(new_vals)
+#                    was_changed = getattr(new_object, 'set_%s' % f.name)(new_vals)
+                    getattr(new_object, f.name).clear()
+                    was_changed = getattr(new_object, f.name).add(*f.rel.to.objects.filter(id__in=new_vals))
+#chang end
                     if self.change and was_changed:
                         self.fields_changed.append(f.verbose_name)