"parent track" function needed to be more specific to the parent class

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/sqlalchemy/attributes.py b/lib/sqlalchemy/attributes.py
index c285ea50c..07b395fee 100644
--- a/lib/sqlalchemy/attributes.py
+++ b/lib/sqlalchemy/attributes.py
@@ -95,10 +95,10 @@ class ManagedAttribute(object):
     def plain_init(self, *args, **kwargs):
         pass
     def hasparent(self, item):
-        return item.__class__._attribute_manager.attribute_history(item).get('_hasparent_' + self.key)
+        return item.__class__._attribute_manager.attribute_history(item).get(('_hasparent_', self.obj.__class__, self.key))
     def sethasparent(self, item, value):
         if item is not None:
-            item.__class__._attribute_manager.attribute_history(item)['_hasparent_' + self.key] = value
+            item.__class__._attribute_manager.attribute_history(item)[('_hasparent_', self.obj.__class__, self.key)] = value
 
 class ScalarAttribute(ManagedAttribute):
     """Used by AttributeManager to track the history of a scalar attribute