Class D

test/orm/test_ac_relationships.py:231–236

            a_id = Column(ForeignKey("a.id"))

        class D(ComparableEntity, Base):
            __tablename__ = "d"

            id = Column(Integer, primary_key=True)
            c_id = Column(ForeignKey("c.id"))
            b_id = Column(ForeignKey("b.id"))

        # 1. set up the join() as a variable, so we can refer
        # to it in the mapping multiple times.