Method test_last_known_tracking

test/orm/test_attributes.py:951–995

(self)

            assert False

    def test_last_known_tracking(self):
        class Foo:
            pass

        instrumentation.register_class(Foo)
        _register_attribute(Foo, "a", useobject=False)
        _register_attribute(Foo, "b", useobject=False)
        _register_attribute(Foo, "c", useobject=False)

        f1 = Foo()
        state = attributes.instance_state(f1)

        f1.a = "a1"
        f1.b = "b1"
        f1.c = "c1"

        assert not state._last_known_values

        state._track_last_known_value("b")
        state._track_last_known_value("c")

        eq_(
            state._last_known_values,
            {"b": attributes.NO_VALUE, "c": attributes.NO_VALUE},
        )

        state._expire_attributes(state.dict, ["b"])
        eq_(state._last_known_values, {"b": "b1", "c": attributes.NO_VALUE})

        state._expire(state.dict, set())
        eq_(state._last_known_values, {"b": "b1", "c": "c1"})

        f1.b = "b2"

        eq_(state._last_known_values, {"b": attributes.NO_VALUE, "c": "c1"})

        f1.c = "c2"

        eq_(
            state._last_known_values,
            {"b": attributes.NO_VALUE, "c": attributes.NO_VALUE},
        )

        state._expire(state.dict, set())
        eq_(state._last_known_values, {"b": "b2", "c": "c2"})


class GetNoValueTest(fixtures.ORMTest):