Is there some way to get the pkey from a detached orm instance (id = obj.id)?
Use case: I'm given an orm object of unknown/untrusted source. I don't want to merge it. I just want to get the id so I can load a known good instance from the db. Is it possible to retrieve it while leaving it in its detached state?
Possibly I could iterate over obj.__dict__ and use del obj.attribute and then merge?
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