title: Getting the rails 'params' without the defaults?
body: <p>Is there a neat way in rails to get a hash of the params without the default ones of 'action' and 'controller'?  Essentially without any param that wasn't added by me.</p>
  
  <p>I've settled for:</p>
  
  <pre><code>parm = params.clone
  parm.delete('action')
  parm.delete('controller');
  </code></pre>
  
  <p>But wondering if there is a neater way to do this?</p>