From 4245d758850bf847d87fe2c9b48d3df82e578c2c Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Thu, 6 Sep 2007 16:58:02 +0000
Subject: [PATCH] associationproxy relies upon a "sweep" through the attributes
 at the class level, restored the equivalent functionality from previous
 releases

---
 lib/sqlalchemy/orm/attributes.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/sqlalchemy/orm/attributes.py b/lib/sqlalchemy/orm/attributes.py
index c2746d9e98..559b97e5ab 100644
--- 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
             
-- 
2.47.3