Method test_state_noload_to_lazy

test/orm/test_deprecations.py:2356–2413

Behavioral test to verify the current activity of loader callables

(self)

class ExpireTest(_fixtures.FixtureTest):
    def test_state_noload_to_lazy(self):
        """Behavioral test to verify the current activity of
        loader callables

        """

        users, Address, addresses, User = (
            self.tables.users,
            self.classes.Address,
            self.tables.addresses,
            self.classes.User,
        )

        self.mapper_registry.map_imperatively(
            User,
            users,
            properties={"addresses": relationship(Address, lazy="noload")},
        )
        self.mapper_registry.map_imperatively(Address, addresses)

        sess = fixture_session(autoflush=False)
        with expect_noload_deprecation():
            u1 = sess.query(User).options(lazyload(User.addresses)).first()
        assert isinstance(
            attributes.instance_state(u1).callables["addresses"],
            strategies._LoadLazyAttribute,
        )
        # expire, it goes away from callables as of 1.4 and is considered
        # to be expired
        sess.expire(u1)

        assert "addresses" in attributes.instance_state(u1).expired_attributes
        assert "addresses" not in attributes.instance_state(u1).callables

        # load it
        sess.query(User).first()
        assert (
            "addresses" not in attributes.instance_state(u1).expired_attributes
        )
        assert "addresses" not in attributes.instance_state(u1).callables

        sess.expunge_all()
        u1 = sess.query(User).options(lazyload(User.addresses)).first()
        sess.expire(u1, ["addresses"])
        assert (
            "addresses" not in attributes.instance_state(u1).expired_attributes
        )
        assert isinstance(
            attributes.instance_state(u1).callables["addresses"],
            strategies._LoadLazyAttribute,
        )

        # load the attr, goes away
        u1.addresses
        assert (
            "addresses" not in attributes.instance_state(u1).expired_attributes
        )
        assert "addresses" not in attributes.instance_state(u1).callables