Method roundtrip

test/ext/test_associationproxy.py:1101–1107

(obj)

        session = fixture_session()

        def roundtrip(obj):
            if obj not in session:
                session.add(obj)
            session.flush()
            id_, type_ = obj.id, type(obj)
            session.expunge_all()
            return session.get(type_, id_)

        p = Parent("p")