Fixes conversion of null genericreferences in querysets

closes #211
2011-07-11 09:19:27 +01:00
parent 556e620c7a
commit dc5a613bc7
2 changed files with 15 additions and 0 deletions
--- a/mongoengine/fields.py
+++ b/mongoengine/fields.py
@@ -653,6 +653,9 @@ class GenericReferenceField(BaseField):
        return doc

    def to_mongo(self, document):
+        if document is None:
+            return None
+
        id_field_name = document.__class__._meta['id_field']
        id_field = document.__class__._fields[id_field_name]