Method test_one

test/orm/test_cycles.py:1537–1588

(self)

                self.name = name

    def test_one(self):
        Child, Parent, parent, child = (
            self.classes.Child,
            self.classes.Parent,
            self.tables.parent,
            self.tables.child,
        )

        self.mapper_registry.map_imperatively(
            Parent,
            parent,
            properties={
                "children": relationship(
                    Child, primaryjoin=parent.c.id == child.c.parent_id
                ),
                "child": relationship(
                    Child,
                    primaryjoin=parent.c.child_id == child.c.id,
                    post_update=True,
                ),
            },
        )
        self.mapper_registry.map_imperatively(
            Child,
            child,
            properties={"parent": relationship(Child, remote_side=child.c.id)},
        )

        session = fixture_session()
        p1 = Parent("p1")
        c1 = Child("c1")
        c2 = Child("c2")
        p1.children = [c1, c2]
        c2.parent = c1
        p1.child = c2

        session.add_all([p1, c1, c2])
        session.flush()

        p2 = Parent("p2")
        c3 = Child("c3")
        p2.children = [c3]
        p2.child = c3
        session.add(p2)

        session.delete(c2)
        p1.children.remove(c2)
        p1.child = None
        session.flush()

        p2.child = None
        session.flush()


class PostUpdatePrefetchTest(fixtures.DeclarativeMappedTest):