假设一个房子,属于哪个市,市里哪个区,一般是怎么设计法?
class City: name = ....
class Area: name = ... belong = ForeignKey(City)
class House: name = ... city = ForeignKey(City) area = ?
还是用其他什么方法? 比如我有个 json 数据,能直接在后台选项那里引用吗??