title: How to return a json object in Rails without using render :json
body: <p>From what I have read, I can respond to a json request by using the following code:</p>
  
  <pre><code>respond_to do |format|
    format.json { render json: t.response }
  end
  </code></pre>
  
  <p>My problem is that t.response is already in json format - and I think that my app is breaking because render json: is re-converting it to json. How do I avoid this, and simply return t.response.</p>
  
  <p>Note that if I simply have t.response as my last line in the controller, the corresponding view is rendered - which is obviously not json.</p>
  
  <p>Thanks!</p>
  
  <p>EDIT: I am trying to get this working so I can send sms via tropo. If you have used tropo before, do you have any suggestions how to respond back to tropo correctly?</p>