title: What's the correct way to reference a helper in a rails controller?
body: <p>Sometimes I need to use helper methods in controllers (sanitization methods, rendering text back to the view, various other applications). What's the right way? I've got:</p>
  
  <ul>
  <li><code>self.class.helpers.myhelper</code></li>
  <li><code>view_context.myhelper</code></li>
  <li><code>include MyHelper; myhelper</code></li>
  <li><code>helper MyHelper; myhelper</code></li>
  </ul>