er thats a little weird, when you unpickle the object, have all the
relevant classes had the same Mappers set up on them ? the _state
attribute is a class-level property accessor that will only be there
if the class has been set up with a mapper (as are all the other
properties for which youre looking for default values). the actual
data for _state is in the __dict__ as "_<classname>__sa_attr_state".
this is all class-level stuff thats not related to the instance being
in or out of a Session.
I know its class-level stuff, but what it has to do with being in or out of a Session is that you can't put it into the session if it doesn't have a _state attribute.
I will attempt to write a simple test case.
-Michael
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