- check for None linker...

diff --git a/lib/sqlalchemy/orm/attributes.py b/lib/sqlalchemy/orm/attributes.py
index 459a52539212ace8fab3d3e04a0647b7ccb6f6ff..2b4c3ec75042208582380f4f0d40d3a431c27bdc 100644 (file)
--- 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):