title: Backbone JS: how to disable sync for delete?
body: <p>I am dealing with a threaded comments collection, and when I delete a comment that has children, I do <code>model.destroy()</code> for this comment, and on the server side all its branches get deleted. </p>
  
  <p>I wrote a function that once a node is deleted from the tree, looks for all orphans and removes them too. So when I find orphans, I run <code>model.destroy()</code> on them too but because they're already deleted on the server, sync returns errors.</p>
  
  <p>Is there a way to disable sync for some <code>destroy()</code> calls?</p>