title: Rails button_to to trigger an action in Model directly
body: <p>I would like to allow user to cancel his Event by clicking a button on show page. I have a method cancel in Event model, but don't want to create a method cancel in Controller if I don't have to.</p>
  
  <p>My questions are:</p>
  
  <ol>
  <li>Is it a good idea to invoke a method in the model directly from view
  in this case?   </li>
  <li>If it is OK, then how should I do it using
  button_to?</li>
  </ol>
  
  <p>Thank you.</p>