title: How to get the id of the model I am currently viewing
body: <p>So lets say I am in /post/2. Which shows me the post with the ID of 2.<br>
  Now in controller, how can I see what the current post id is that is being viewed?  </p>
  
  <p>My case is a bit different because I am also rendering a partial from another controller into the posts page. And if I delete one of the entries from that partial, I will also need to know the current post id that is being watched.</p>