On 9/3/14 4:32 PM, Josh English wrote:
I am using jsonpickle to store instances of an object into separate data files.
If I make any changes to the original class definition of the object, when I
recreate my stored instances, they are recreated using the original class
definition, so any new attributes, methods, or properties, are lost.
I think this is happening because JSON is internalizing the class definition,
ignoring the updates. Is this true? Is it possible to refresh JSON's knowledge
of a class?
Pickle (and it looks like jsonpickle) does not invoke the class'
__init__ method when it reconstitutes objects. Your new __init__ is not
being run, so new attributes it defines are not being created.
This is one of the reasons that people avoid pickle: being completely
implicit is very handy, but also fragile.
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Ned Batchelder, http://nedbatchelder.com
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