title: How do I sort a collection that has already been rendered? Like AngularJS's orderBy directive
body: <p>How do I sort or manipulate a data collection that has already rendered? </p>
  
  <p>I have a template helper registered that is defined more or less like:</p>
  
  <pre><code>Template.home.helpers({
      posts: function() {
            return Posts.find({}, { sort: { createdAt: -1 } });
      }
  });
  </code></pre>
  
  <p>Which sorts the posts by the most recent ones appearing first. But I want to implement a functionality that reverses this; displaying the oldest posts first.</p>
  
  <p>What is the MeteorJS way of doing it? Any ideas/help is much appreciated.</p>