From dd061f40b4b8fd06bec0b75dd245aa043694dd5f Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Sat, 10 Jun 2006 19:40:26 +0000
Subject: [PATCH] "parent track" function needed to be more specific to the
 parent class

---
 lib/sqlalchemy/attributes.py |  4 ++--
 test/base/attributes.py      | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/lib/sqlalchemy/attributes.py b/lib/sqlalchemy/attributes.py
index c285ea50c0..07b395fee0 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
diff --git a/test/base/attributes.py b/test/base/attributes.py
index bff864fa69..382e9863ef 100644
--- a/test/base/attributes.py
+++ b/test/base/attributes.py
@@ -166,6 +166,31 @@ class AttributesTest(PersistTest):
         assert y.element == 'this is the bar attr'
         assert x.element2 == 'this is the shared attr'
         assert y.element2 == 'this is the shared attr'
+
+    def testparenttrack(self):    
+        class Foo(object):pass
+        class Bar(object):pass
+
+        manager = attributes.AttributeManager()
+
+        manager.register_attribute(Foo, 'element', uselist=False, trackparent=True)
+        manager.register_attribute(Bar, 'element', uselist=False, trackparent=True)
+
+        f1 = Foo()
+        f2 = Foo()
+        b1 = Bar()
+        b2 = Bar()
+
+        f1.element = b1
+        b2.element = f2
+
+        assert manager.get_history(f1, 'element').hasparent(b1)
+        assert not manager.get_history(f1, 'element').hasparent(b2)
+        assert not manager.get_history(f1, 'element').hasparent(f2)
+        assert manager.get_history(b2, 'element').hasparent(f2)
+
+        b2.element = None
+        assert not manager.get_history(b2, 'element').hasparent(f2)
         
 if __name__ == "__main__":
     unittest.main()
-- 
2.47.2