Angular Firebase Service

angularfirebase.js

// In this case it is a simple value service.
angular.module('myApp.services', ['firebase']).
  value('version', '0.1')

  // Serviço criado para persistir dados no firebase, 
  // com a possibilidade de ser a propria persistencia em base de dados como mongodb etc..
  .service('Firebase', function($rootScope, $firebase) {

    return {
      url: 'https://myurl.firebaseio.com',
      path: '',
      reference: null,

      _construct: function(path) {
        this.path = path;
        var ref = new Firebase(this.url + '/' + path);
        this.reference = $firebase(ref);
      },

      on: function(eventName, callback) {

        var _this = this;

        _this.reference.$on(eventName, function () {  

          var args = arguments;

          $rootScope.$apply(function () {

            callback.apply(_this.reference, args);
            
          });
        });

      },

      add: function(item) {
        var _ref = this.reference;
        _ref.push(item);
      }
    }

  });

controllerfirebase.js

angular.module('myApp.services', []).
controller('FirebaseController', function ($scope, Firebase, $timeout) {
    $scope.predicate = '';

    Firebase._construct('tarifas');

    Firebase.on('loaded', function(data) {

      $timeout(function() {

        console.log('waddup');
        console.log(data);

        //$scope.messages.push(data.val());                       
      },0);

    });


 });