gistfile1.js

var PopularAssetsFilter = Chute.Data.Filter.extend({
  initialize: function(data) {
    this.data = data; // saving reference to Chute.Data object
    this.filter();
  },
  
  filter: function() {
    var assets = this.data;
    
    var popularAssets = _.filter(assets, function(asset){
      return asset.hearts > 10;
    });
    
    this.done(popularAssets);
  }
});