Method setup_mappers

test/orm/test_joins.py:2316–2332

(cls)

    @classmethod
    def setup_mappers(cls):
        parent, child = cls.tables.parent, cls.tables.child

        class Parent(cls.Comparable):
            pass

        class Child(cls.Comparable):
            pass

        mp = cls.mapper_registry.map_imperatively(Parent, parent)
        cls.mapper_registry.map_imperatively(Child, child)

        derived = select(child).alias()
        npc = aliased(Child, derived)
        cls.npc = npc
        cls.derived = derived
        mp.add_property("npc", relationship(npc))

    def test_join_parent_child(self):
        Parent = self.classes.Parent