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

Question

I want to do something like this:

class AttachmentsController < ApplicationController
  def upload
    render :json => { :attachmentPartial => rende         


        

Answer 1

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

To render an html partial in a json response, you don't actually need the with_format helper as explained in mbillard's answer. You simply need to specify the format in the call to render_to_string, like formats: :html.

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