title: How to save a Collection with backbone.js
body: <p>I have a hierarchy of categories.  I use a jquery library for the hierarchy to get all jumbled up the way the user wants.  Then they click save.  So the initial hierarchy and hierarchy to be saved could be totally different.</p>
  
  <p>The hierarchy is represented as a collection and I use parentIds to build a tree using ol and li tags.</p>
  
  <p>When the user clicks save, I then need to update all the items in the collection with their new parentId and sync each one with the server.</p>
  
  <p>I'm wondering if anyone has any advice on how to proceed here.  I've seen in the documentation for Backbone.sync, ''Use <code>setTimeout</code> to batch rapid-fire updates into a single request.''  So, if I understand correctly, I would queue each of the calls to Backbone.sync and then use setTimeout to send my queue to the server after a few seconds?</p>
  
  <p>Also, if I rewrite Backbone.sync, don't I still need a 'save' method somewhere for the collection that will parse the json of the response (the server response would have to send back a list of objects) and then call model.set on each item in the collection?  Does any one have any example code?  </p>
  
  <p>Thanks!</p>