Method setup_mappers

test/orm/test_joins.py:2408–2422

(cls)

    @classmethod
    def setup_mappers(cls):
        Node, nodes = cls.classes.Node, cls.tables.nodes

        cls.mapper_registry.map_imperatively(
            Node,
            nodes,
            properties={
                "children": relationship(
                    Node,
                    lazy="select",
                    join_depth=3,
                    backref=backref("parent", remote_side=[nodes.c.id]),
                )
            },
        )

    @classmethod
    def insert_data(cls, connection):