Ruby-on-rails rails 3 - 如何将 PARTIAL 渲染为 Json 响应

rails 3 - How to render a PARTIAL as a Json response

提问by AnApprentice

I want to do something like this:

我想做这样的事情：

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

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

有没有办法做到这一点？在 JSON 对象中呈现 Partial？谢谢

回答by mbillard

This should work:

这应该有效：

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

Notice the render_to_stringand the underscore _in before the name of the partial (because render_to_string doesn't expect a partial, hence the :layout => falsetoo).

注意部分名称之前的render_to_string和下划线_（因为 render_to_string 不期望部分，因此:layout => false也是）。

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UPDATE

更新

If you want to render htmlinside a jsonrequest for example, I suggest you add something like this in application_helper.rb:

例如，如果您想html在json请求中呈现，我建议您在application_helper.rb以下内容中添加以下内容：

# 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

Then you can just do this in your method:

然后你可以在你的方法中做到这一点：

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

回答by jibai31

This question is a bit old, but I thought this might help some folks.

这个问题有点老了，但我认为这可能会帮助一些人。

To render an htmlpartial in a jsonresponse, you don't actually need the with_formathelper as explained in mbillard's answer. You simply need to specify the format in the call to render_to_string, like formats: :html.

要在json响应中呈现html部分，您实际上并不需要帮助程序，如 mbillard 的回答中所述。您只需要在对 的调用中指定格式，例如.with_formatrender_to_stringformats: :html

def upload
  render json: { 
    attachmentPartial: 
      render_to_string(
        partial: 'messages/attachment', 
        formats: :html, 
        layout: false, 
        locals: { message: @message }
      )
  }
end