ruby 将字符串中的类名转换为实际类 [英] ruby convert class name in string to actual class

问题描述

如何从包含类名的字符串中调用类?(我想我可以做 case/when 但这看起来很难看.)

How do I call a class from a string containing that class name inside of it? (I guess I could do case/when but that seems ugly.)

我问的原因是因为我正在使用 acts_as_commentable 插件等，这些插件将 commentable_type 存储为一列.我希望能够调用任何特定的可评论类来对其进行 find(commentable_id).

The reason I ask is because I'm using the acts_as_commentable plugin, among others, and these store the commentable_type as a column. I want to be able to call whatever particular commentable class to do a find(commentable_id) on it.

谢谢.

推荐答案

我想你想要的是 常量化

I think what you want is constantize

这是一个 RoR 结构.不知道有没有ruby core的

That's an RoR construct. I don't know if there's one for ruby core

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