diff --git a/djangoratings/fields.py b/djangoratings/fields.py
index 419e582..a583871 100644
--- a/djangoratings/fields.py
+++ b/djangoratings/fields.py
@@ -357,11 +357,11 @@ def contribute_to_class(self, cls, name):
 
         setattr(cls, name, field)
 
-    def get_db_prep_save(self, value):
+    def get_db_prep_save(self, value, connection=None):
         # XXX: what happens here?
         pass
 
-    def get_db_prep_lookup(self, lookup_type, value):
+    def get_db_prep_lookup(self, lookup_type, value, connection=None, prepared=False):
         # TODO: hack in support for __score and __votes
         # TODO: order_by on this field should use the weighted algorithm
         raise NotImplementedError(self.get_db_prep_lookup)
@@ -369,9 +369,9 @@ def get_db_prep_lookup(self, lookup_type, value):
         #     lookup_type = 
         #     return self.score_field.get_db_prep_lookup()
         if lookup_type == 'exact':
-            return [self.get_db_prep_save(value)]
+            return [self.get_db_prep_save(value, connection)]
         elif lookup_type == 'in':
-            return [self.get_db_prep_save(v) for v in value]
+            return [self.get_db_prep_save(v, connection) for v in value]
         else:
             return super(RatingField, self).get_db_prep_lookup(lookup_type, value)