Class A

test/ext/test_associationproxy.py:3496–3505

        Base = cls.DeclarativeBasic

        class A(Base):
            __tablename__ = "a"

            id = Column(Integer, primary_key=True)
            data = Column(String)
            bs = relationship("B", backref="a")

            b_data = association_proxy("bs", "data")

            b_data_syn = synonym("b_data")

        class B(Base):
            __tablename__ = "b"