Could we add this new method on sqlalchemy.orm.Session?
def get_local(self, class_, ident, entity_name=None):
"""Get an object from the identity map (do not hit the database)
Returns None if the object does not exist in this session's
identity map.
"""
idkey = self.mapper(class_,
entity_name=entity_name).identity_key(ident)
return self.identity_map.get(idkey)
This is handy for doing tasks such as expiring/expunging/etc. an
instance but only if it exists in the session. I'm not sure if it
makes sense to have the entity_name parameter because I've never used
it before, but I added it just in case.
Thanks,
~ Daniel
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