associationproxy relies upon a "sweep" through the attributes at the class level,

restored the equivalent functionality from previous releases

diff --git a/lib/sqlalchemy/orm/attributes.py b/lib/sqlalchemy/orm/attributes.py
index c2746d9e98cde91297132c8f14c0604224f09bfe..559b97e5ab835dc9e8b3d01ddeaaccfb793f157f 100644 (file)
--- a/lib/sqlalchemy/orm/attributes.py
+++ b/lib/sqlalchemy/orm/attributes.py
@@ -834,6 +834,11 @@ class AttributeManager(object):
         """decorate the constructor of the given class to establish attribute
         management on new instances."""
 
+        # do a sweep first, this also helps some attribute extensions
+        # (like associationproxy) become aware of themselves at the 
+        # class level
+        self.unregister_class(class_)
+        
         oldinit = None
         doinit = False