ruby-on-rails - rails 3 - 如何将 PARTIAL 渲染为 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 对象中呈现 Partial？谢谢

Answer 1

这应该有效:

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

请注意 render_to_string 和下划线 _在局部名称之前(因为 render_to_string 不期望局部，因此 :layout => false 也是)。

更新

如果要渲染 html里面 json例如请求，我建议您在 application_helper.rb 中添加这样的内容:

# 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

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