title: cannot load such file -- ../helpers/ping
body: <p>i have a class in my <code>ruby</code> app, let's call it <code>ping</code>
  and i have put this class in the <code>app/helpers</code> folder. I am trying to require this class to my controller using this code:</p>
  
  <pre><code>require '../helpers/ping'
  
  class PingController &lt; ApplicationController
      def index
       end
  end
  </code></pre>
  
  <p>but the problem is, when i load the index view, it complains with the error:</p>
  
  <pre><code>cannot load such file -- ../helpers/ping
  </code></pre>
  
  <p>How can i fix it?</p>