Ruby on Rails高级JSON序列化 [英] Ruby on Rails Advanced JSON Serialization

问题描述

我希望在Rails应用程序中通过JSON呈现所有文章的索引以及完整的文章，但是我在弄清楚如何做到这一点上遇到了一些麻烦.

I'm looking to render an index of all articles along with a full article via JSON in my rails app, but I'm having a little trouble figuring out how to do it.

现在是我的控制人:

if params[:id]
    @article = Article.find(params[:id])
else
    @article = Article.published.not_draft.by_recent.first
end

respond_to do |format|

format.js { render :json => @article.to_json(
:except => [ :created_at, :updated_at, :draft, :id, :publish ], 
:include => {
    :comments => {
        :only => [:body]
    }
}),
:callback => params[:callback]}
end

我想在响应中要做的是添加所有文章的索引，如下所示:

What I'd like to do in the response is add an index of all articles, like so:

@index = Article.find(:all, :select => 'id, title')

我能够做到的唯一方法是将索引和文章都放入哈希或数组中，然后将其放入JSON中.

The only way I've been able to do it, is put both the index and article into a hash or array and then put that to JSON.

@response = { :item => @article, :index => @index }

同时提供完整代码:

@index = Article.find(:all, :select => 'id, title')

if params[:id]
    @article = Article.find(params[:id])
else
    @article = Article.published.not_draft.by_recent.first
end

@response = { :item => @article, :index => @index }

respond_to do |format|

format.js { render :json => @response.to_json(), :callback => params[:callback]}

end

这很好，除非现在我不能指定:include或:except并使其正确呈现.

This would be fine, except now I cannot specify :include or :except and get it to render properly.

推荐答案

您会提示问题中的解决方案.您最有可能想要建立一个散列以呈现为JSON.现在，这样做的首选方法是为as_json方法提供一个实现. as_json提供了一种正式的方式，可以通过建立包含要编码的数据的散列来定制to_json输出.

You hint at the solution in your question. You most likely want to build up a hash to render to JSON. The preferred way of doing this now is by providing an implementation for the as_json method. as_json provides a formal means of customizing to_json output by building up a hash containing the data you wish to encode.

可以在乔纳森(Jonathan)上找到有关as_json和to_json交互方式的更彻底的方法.朱利安的网志.

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