From e4996d4f5432657639798c1b286ee811a36e2a10 Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Mon, 8 Sep 2014 13:01:43 -0400
Subject: [PATCH] - check for None linker...

---
 lib/sqlalchemy/orm/attributes.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/sqlalchemy/orm/attributes.py b/lib/sqlalchemy/orm/attributes.py
index 459a525392..2b4c3ec750 100644
--- a/lib/sqlalchemy/orm/attributes.py
+++ b/lib/sqlalchemy/orm/attributes.py
@@ -863,7 +863,7 @@ class CollectionAttributeImpl(AttributeImpl):
         self.copy = copy_function
         self.collection_factory = typecallable
 
-        if hasattr(self.collection_factory, "_sa_linker"):
+        if getattr(self.collection_factory, "_sa_linker", None):
 
             @event.listens_for(self, "init_collection")
             def link(target, collection, collection_adapter):
-- 
2.47.3