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        m = mapper(User, users_table, extension=MyExtension())

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        class MySessionExtension(SessionExtension):
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        class MyAttrExt(AttributeExtension):
            def append(self, state, value, initiator):
                print "append event !"
                return value

            def set(self, state, value, oldvalue, initiator):
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                return value

        mapper(SomeClass, sometable, properties={
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            'bar':relationship(Bar, extension=MyAttrExt())
        })

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