Method test_attribute_cascade

test/orm/test_merge.py:618–761

Merge of a persistent entity with two child persistent entities.

(self)

        assert list(u1.addresses.keys()) == ["foo@bar.com"]

    def test_attribute_cascade(self):
        """Merge of a persistent entity with two child
        persistent entities."""

        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(
                    self.mapper_registry.map_imperatively(Address, addresses),
                    backref="user",
                )
            },
        )
        load = self.load_tracker(User)
        self.load_tracker(Address, load)

        with fixture_session(expire_on_commit=False) as sess, sess.begin():
            # set up data and save
            u = User(
                id=7,
                name="fred",
                addresses=[
                    Address(email_address="foo@bar.com"),
                    Address(email_address="hoho@la.com"),
                ],
            )
            sess.add(u)

        # assert data was saved
        sess2 = fixture_session()
        u2 = sess2.get(User, 7)
        eq_(
            u2,
            User(
                id=7,
                name="fred",
                addresses=[
                    Address(email_address="foo@bar.com"),
                    Address(email_address="hoho@la.com"),
                ],
            ),
        )

        # make local changes to data
        u.name = "fred2"
        u.addresses[1].email_address = "hoho@lalala.com"

        eq_(load.called, 3)

        # new session, merge modified data into session