Method test_conflicting_backref_one

test/orm/test_compile.py:120–189

test that conflicting backrefs raises an exception

(self)

        configure_mappers()

    def test_conflicting_backref_one(self):
        """test that conflicting backrefs raises an exception"""

        metadata = MetaData()

        order = Table(
            "orders",
            metadata,
            Column("id", Integer, primary_key=True),
            Column("type", Unicode(16)),
        )

        product = Table(
            "products", metadata, Column("id", Integer, primary_key=True)
        )

        orderproduct = Table(
            "orderproducts",
            metadata,
            Column("id", Integer, primary_key=True),
            Column(
                "order_id", Integer, ForeignKey("orders.id"), nullable=False
            ),
            Column(
                "product_id",
                Integer,
                ForeignKey("products.id"),
                nullable=False,
            ),
        )

        class Order:
            pass

        class Product:
            pass

        class OrderProduct:
            pass

        order_join = order.select().alias("pjoin")

        self.mapper_registry.map_imperatively(
            Order,
            order,
            with_polymorphic=("*", order_join),
            polymorphic_on=order_join.c.type,
            polymorphic_identity="order",
            properties={
                "orderproducts": relationship(
                    OrderProduct, lazy="select", backref="product"
                )
            },
        )

        self.mapper_registry.map_imperatively(
            Product,
            product,