Re: Objects with varying classes

Here is my two cents. 

I recently looked at teh set state methods in class persistent. 
They have the database id of the object, and the database of the object. 

So to change the class of the object, you have to set item._p_changed = True  for all of the objects that refer to the the object on which you changed the class. 

You only saved the object, not the reference to it, so there was trouble.   At least that is my guess. 

As for BTrees, if they get changed, then the buckets get saved.  Otherwise they would not work. 

Hope that helps. 

Chris

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