heres a version of the persistent_id function that also saves the Bar
instance automatically, using the same transaction as the current flush
context:
def persistent_id(self, obj):
if getattr(obj, "id", None) is None:
sess = MyPickler.sessions.current
newsess =
create_session(bind_to=sess.connection(class_mapper(Bar)))
newsess.save(obj)
newsess.flush()
key = "%s:%s" % (type(obj).__name__, obj.id)
return key
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