反向多态关联 [英] Reverse Polymorphic Associations

问题描述

我有一个父对象，邮政，它具有以下的儿童。

I have a parent object, Post, which has the following children.

has_one :link
has_one :picture
has_one :code

这些孩子是互斥的。

These children are mutually exclusive.

有没有办法使用反向多态关联，这样我就不必有link_id，picture_id和code_ID领域在我的岗位表？一个办法

Is there a way to use polymorphic associations in reverse so that I don't have to have link_id, picture_id, and code_id fields in my Post table?

推荐答案

我写了一个小要点展示如何做到这一点：
https://gist.github.com/1242485

I wrote up a small Gist showing how to do this: https://gist.github.com/1242485

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