有点看不太懂 SQLAlchemy 的 relationship - V2EX

有点看不太懂 SQLAlchemy 的 relationship - V2EX

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This topic created in 4782 days ago, the information mentioned may be changed or developed.

比如这段v0.8的官方的example:
https://gist.github.com/anonymous/5329921

OrderItem.order_id 是指向 Order 的外键，但 Order.order_items 右边的 relationship 的参数里没出现 OrderItem.order_id ，那 Order.order_items 这个反向引用是怎么知道要的数组是所有 OrderItem.order_id 等于自己的那些 OrderItem 呢？假如 OrderItem 里还有个 another_order_id 也是指向 Order 的外键，又该怎么破？

2 replies 1970-01-01 08:00:00 +08:00

1

leojoy710

&nbs;Apr 7, 2013

another_order_id -> another_order_items ?

2

node

OP

Apr 7, 2013

你的意思是sqlalchemy在玩string游戏？即便是这样 order_items 和 OrderItem 的字面关系也就是去掉 s 再改成大写开头，从逻辑上来讲肯定不会对应出 another_order_items 的（这个example的变量取名有点乱）
另外官方文档还有个 User 和 Address 的例子，User 有个叫 addresses 的反向 relationship ，玩string的话不会强悍到连后面加s还是es都能搞的定吧

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