Method test_merge_persistent

test/orm/test_dynamic.py:1529–1571

(self, merge_type, user_address_fixture)

        "empty", "persistent", "transient", argnames="merge_type"
    )
    def test_merge_persistent(self, merge_type, user_address_fixture):
        addresses = self.tables.addresses
        User, Address = user_address_fixture(
            addresses_args={"order_by": addresses.c.email_address}
        )
        sess = fixture_session(autoflush=False)

        a1 = Address(email_address="a1")
        a2 = Address(email_address="a2")
        a3 = Address(email_address="a3")
        u1 = User(name="jack", addresses=[a2, a3])

        if merge_type == "transient":
            # merge transient.  no collection iteration is implied by this.
            u1 = sess.merge(u1)
            sess.add(a1)
        else:
            sess.add_all([u1, a1])
        sess.flush()

        if merge_type == "persistent":
            u1 = User(id=u1.id, name="jane", addresses=[a1, a3])

            # merge of populated list into persistent not supported with
            # write_only because we would need to iterate the existing list
            with self._expect_no_iteration():
                u1 = sess.merge(u1)

        elif merge_type == "empty":
            # merge while omitting the "too large to load" collection
            # works fine.
            u1 = User(id=u1.id, name="jane")
            u1 = sess.merge(u1)

            eq_(
                attributes.get_history(
                    u1, "addresses", PassiveFlag.PASSIVE_NO_FETCH
                ),
                ([], [], []),
            )

            sess.flush()
            eq_(sess.scalars(u1.addresses.select()).all(), [a2, a3])

    def test_passive_deletes_required(self, user_address_fixture):
        addresses = self.tables.addresses