如何在Rails 3中自定义to_json响应 [英] How to customize to_json response in Rails 3

问题描述

我正在使用 respond_with ，所有内容都已正确连接以正确获取数据。我想自定义返回的 json ， xml 和 foobar 格式以DRY方式进行，但我无法弄清楚如何使用受限的：only 和：include 来实现此目的。当数据很简单时，这些功能非常有用，但是在发现复杂数据时，它们却达不到我想要的水平。

I am using respond_with and everything is hooked up right to get data correctly. I want to customize the returned json, xml and foobar formats in a DRY way, but I cannot figure out how to do so using the limited :only and :include. These are great when the data is simple, but with complex finds, they fall short of what I want.

让我说我有一个帖子， has_many 图片

Lets say I have a post which has_many images

def show
  @post = Post.find params[:id]
  respond_with(@post)
end

我想包含图像响应，这样我就可以做到：

I want to include the images with the response so I could do this:

def show
  @post = Post.find params[:id]
  respond_with(@post, :include => :images)
end

但我真的不想发送整个图像对象，只是URL。除此之外，我真的也希望能够做类似的事情（伪代码）：

but I dont really want to send the entire image object along, just the url. In addition to this, I really want to be able to do something like this as well (pseudocode):

def show
  @post = Post.find params[:id]
  respond_with(@post, :include => { :foo => @posts.each.really_cool_method } )
end

def index
  @post = Post.find params[:id]
  respond_with(@post, :include => { :foo => @post.really_cool_method } )
end

…但是全部以DRY方式进行。在较早的Rails项目中，我使用了XML构建器来定制输出，但是在看起来不正确的地方跨json，xml，html复制了它。我必须想象，Rails专家在Rails 3中添加了一些我没有意识到的行为。

… but all in a DRY way. In older rails projects, I have used XML builders to customize the output, but replicating it across json, xml, html whatever doesnt seem right. I have to imagine that the rails gurus put something in Rails 3 that I am not realizing for this type of behavior. Ideas?

推荐答案

这不是Rails 3的内置方式，但是我发现可以在Rails上积极维护的出色宝石3： acts_as_api

It is not the rails 3 built-in way, but I found a great gem that is actively maintained on Rails 3: acts_as_api

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