Filtering model data with Ember Enumerable methods

Full code:

http://ift.tt/1wbXklZ

I'm attempting to filter some model data by calling .filter on the record array returned from the store, but it has no effect.

My controller:

 App.IndexController = Ember.Controller.extend({
  fooDataOne: function() {
    var fooData = this.get('fooData');
    // If uncommented, I return both items
    // return fooData;
    return fooData.filter(function(item) {
      console.log("Why am I not filtering?"); // Never called
      if(item.get('id') == 1) { return true; }
    });
  }.property('fooData')
});

Is it not possible to call .filter as I'm wanting to here? What should I do instead?