Question

鉴于这些SQLAlchemy模型：

class Key():
    key_id = Column('id', Integer, primary_key=True, autoincrement=True)
    name = Column(String(255))

class House():
    house_id = Column('id', Integer, primary_key=True, autoincrement=True)
    name = Column(String(255))

class HouseKey():
    house_key_id = Column('id', Integer, primary_key=True, autoincrement=True)
    house_id = Column(Integer, ForeignKey('house.id'))
    key_id = Column(Integer, ForeignKey('key.id'))

    UniqueConstraint('house_id', 'key_id')

    house = relationship('House', foreign_keys=[house_id])
    key = relationship('Key', foreign_keys=[key_id])

未创建house_id, key_id唯一键。我相信this就是为什么（如果我错了，请纠正我。）

如何在也是外键的列上创建复合唯一键？

Answer 1

表级UNIQUE限制符合__table_args__：

class HouseKey(Base):
    ...
    __table_args__ = (UniqueConstraint("house_id", "key_id"),)

在多个外键上组合唯一键

1 个答案: