Method test_inheritance2

test/orm/test_attributes.py:738–769

test that the attribute manager can properly traverse the managed attributes of an object, if the object is of a descendant class with managed attributes in the parent class

(self)

        eq_(list(states)[0].obj(), b)

    def test_inheritance2(self):
        """test that the attribute manager can properly traverse the
        managed attributes of an object, if the object is of a
        descendant class with managed attributes in the parent class"""

        class Foo:
            pass

        class Bar(Foo):
            pass

        class Element:
            _state = True

        instrumentation.register_class(Foo)
        instrumentation.register_class(Bar)
        _register_attribute(Foo, "element", uselist=False, useobject=True)
        el = Element()
        x = Bar()
        x.element = el
        eq_(
            attributes.get_state_history(
                attributes.instance_state(x), "element"
            ),
            ([el], (), ()),
        )
        attributes.instance_state(x)._commit_all(attributes.instance_dict(x))
        added, unchanged, deleted = attributes.get_state_history(
            attributes.instance_state(x), "element"
        )
        assert added == ()
        assert unchanged == [el]

    def test_lazyhistory(self):
        """tests that history functions work with lazy-loading attributes"""