On Jun 20, 2013, at 1:43 PM, Chris Withers <[email protected]> wrote:
> Digging up an old thread, this time with (I hope) correct terminology:
>
> If I have a transient object which has had some attributes set on it, what
> would be the best way to use that object to load an object based on those
> attributes from the database?
>
> I didn't noticed a session.lookup(myobj) method ;-)
The mapper has all the identity key functions now:
from sqlalchemy import inspect
def lookup(session, obj):
mapper = inspect(obj).mapper
return session.query(mapper).get(mapper.primary_key_from_instance(obj))
a2 = A(id=1)
assert lookup(s, a2) is a1, "%r != %r" % (a1, a2)
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