rails 3 - 如何将PARTIAL呈现为Json响应

Question

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对象中渲染部分？谢谢

Answer 1

这应该工作:

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

请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).

UPDATE

例如,如果你想html在json请求中进行渲染,我建议你添加这样的东西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执行此操作:

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

Answer 2

这个问题有点老了，但我认为这可能对某些人有所帮助。

要在json响应中呈现html局部，实际上不需要mbillard的答案中所述的帮助器。您只需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