Class A

test/orm/test_cache_key.py:1178–1183

        Base = cls.DeclarativeBasic

        class A(ComparableMixin, Base):
            __tablename__ = "a"

            id = Column(Integer, Identity(), primary_key=True)
            data = Column(String(30))
            bs = relationship("B")

        class B(ComparableMixin, Base):
            __tablename__ = "b"