rails 3 - 如何将 PARTIAL 渲染为 Json 响应 [英] rails 3 - How to render a PARTIAL as a Json response

问题描述

我想做这样的事情:

class AttachmentsController < ApplicationController
  def upload
    render :json => { :attachmentPartial => render :partial => 'messages/attachment', :locals => { :message=> @message} }
  end

有没有办法做到这一点?在 JSON 对象中呈现 Partial?谢谢

Is there a way to do this? render a Partial inside a JSON object? thanks

推荐答案

这应该有效:

def upload
    render :json => { :attachmentPartial => render_to_string('messages/_attachment', :layout => false, :locals => { :message => @message }) }
end

注意部分名称之前的 render_to_string 和下划线 _(因为 render_to_string 不需要部分，因此 :layout =>也是错误的).

Notice the render_to_string and the underscore _ in before the name of the partial (because render_to_string doesn't expect a partial, hence the :layout => false too).

更新

例如，如果您想在 json 请求中呈现 html，我建议您在 application_helper.rb 中添加如下内容:

If you want to render html inside a json request for example, I suggest you add something like this in application_helper.rb:

# execute a block with a different format (ex: an html partial while in an ajax request)
def with_format(format, &block)
  old_formats = formats
  self.formats = [format]
  block.call
  self.formats = old_formats
  nil
end

然后你可以在你的方法中做到这一点:

Then you can just do this in your method:

def upload
  with_format :html do
    @html_content = render_to_string partial: 'messages/_attachment', :locals => { :message => @message }
  end
  render :json => { :attachmentPartial => @html_content }
end

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