Method test_no_delete_PK_AtoB

test/orm/test_relationships.py:1648–1678

A can't be deleted without B because B would have no PK value.

(self)

            sess.commit()

    def test_no_delete_PK_AtoB(self):
        """A can't be deleted without B because B would have no PK value."""

        tableB, A, B, tableA = (
            self.tables.tableB,
            self.classes.A,
            self.classes.B,
            self.tables.tableA,
        )

        self.mapper_registry.map_imperatively(
            A,
            tableA,
            properties={"bs": relationship(B, cascade="save-update")},
        )
        self.mapper_registry.map_imperatively(B, tableB)

        a1 = A()
        a1.bs.append(B())
        with fixture_session() as sess:
            sess.add(a1)
            sess.flush()

            sess.delete(a1)

            assert_raises_message(
                AssertionError,
                "Dependency rule on column 'tableA.id' tried to blank-out "
                "primary key column 'tableB.id' on instance ",
                sess.flush,
            )

    def test_no_delete_PK_BtoA(self):
        tableB, A, B, tableA = (