title: undefined method respond_to in Rails 5 controller
body: <p>I'm upgrading an app from rails 3.something to rails 5.  For some reason, I'm am getting undefindied method respond_to anytime I use that method in any of my controllers.  This was working before and I was hoping someone here could help.</p>
  
  <pre><code>class StatusController &lt; ApplicationController
  
    #this throws an error 'undefined method respond_to
    respond_to :json, :html     
   end
  </code></pre>