Method test_viewonly

test/orm/test_relationships.py:3181–3212

(self)

        )

    def test_viewonly(self):
        t1t2, t2, t1 = (self.tables.t1t2, self.tables.t2, self.tables.t1)

        class A(ComparableEntity):
            pass

        class B(ComparableEntity):
            pass

        self.mapper_registry.map_imperatively(
            A,
            t1,
            properties={
                "bs": relationship(
                    B, secondary=t1t2, backref=backref("as_", viewonly=True)
                )
            },
        )
        self.mapper_registry.map_imperatively(B, t2)

        configure_mappers()

        sess = fixture_session()
        a1 = A()
        b1 = B(as_=[a1])

        assert not inspect(b1).attrs.as_.history.has_changes()

        sess.add(a1)
        sess.flush()
        eq_(sess.query(A).first(), A(bs=[]))
        eq_(sess.query(B).first(), None)


class ViewOnlyOverlappingNames(fixtures.MappedTest):