- fixed bugs in determining proper sync clauses from custom inherit

  conditions [ticket:769]

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/sqlalchemy/orm/sync.py b/lib/sqlalchemy/orm/sync.py
index 795d76b1a..d85842861 100644
--- a/lib/sqlalchemy/orm/sync.py
+++ b/lib/sqlalchemy/orm/sync.py
@@ -9,7 +9,7 @@ attributes between two objects in a manner corresponding to a SQL
 clause that compares column values.
 """
 
-from sqlalchemy import schema, exceptions
+from sqlalchemy import schema, exceptions, util
 from sqlalchemy.sql import visitors, operators
 from sqlalchemy import logging
 from sqlalchemy.orm import util as mapperutil
@@ -53,10 +53,10 @@ class ClauseSynchronizer(object):
                 if binary.left.table == binary.right.table:
                     raise exceptions.ArgumentError("need foreign_keys argument for self-referential sync")
 
-                if binary.left in [f.column for f in binary.right.foreign_keys]:
+                if binary.left in util.Set([f.column for f in binary.right.foreign_keys]):
                     dest_column = binary.right
                     source_column = binary.left
-                elif binary.right in [f.column for f in binary.left.foreign_keys]:
+                elif binary.right in util.Set([f.column for f in binary.left.foreign_keys]):
                     dest_column = binary.left
                     source_column = binary.right
             else: