The actual work is the transformation of instances of class "A.Foo" to class "B.Foo"; to be on the safe side one would have to copy over all attributes manually. If You want to try a fast and dirty solution, You could try to write the new class into the '__class__' attribute of the instance of the old class, making it an instance of the new class, but I do not know it this really works.
Somebody correct me please, if I'm wrong, but
1. tinkering with __class__ is the only way to do this.
2. you can not tinker with __class__ of an ExtensionClass, i.e. all Persistent objects.
So, it is not doable, IIRC.
Phil
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