Service with Angular.js in Ionic Framework to get Products from Web Service or Local Storage using Promises and ngCordova

app.js

var app = angular.module('demo', ['ionic', 'ngCordova', 'demo.controllers', 'demo.services']);

var controllers = angular.module('demo.controllers', []);
var services = angular.module('demo.services', []);

productsController.js

controllers.controller('ProductsController', ['$scope', 'Products', '$ionicPopup', function ($scope, Products, $ionicPopup) {
    
    $scope.products = [];
    
    Products.getProducts().then(function (products) {
        $scope.products = products;
    }, function (error) {
        $ionicPopup.alert({
            title: 'Warning',
            template: error
        });
    });
} ]);

productsService.js

services.factory('Products', function ($http, $q, $cordovaNetwork) {
    
    return {
        getProducts: function () {
            var deferred = $q.defer();

            var isOnline = false;
            try {
                isOnline = $cordovaNetwork.isOnline();
            }
            catch (e) { // For debugging in the browser
                isOnline = true;
            }

            var self = this;

            if (isOnline) {
                $http.get("http://www.nicholls.co/mywebservice/products").then(function (response) {

                    self.setProducts(response.data);
                    return deferred.resolve(response.data);
                }, function () {

                    return deferred.reject('Error communicating with the server');
                });
            } else {

                var products = self.getProductsFromLocal();
                if (products) {
                    deferred.resolve(products);
                } else {
                    return deferred.reject('You need to connect to internet for get products');
                }
            }

            return deferred.promise;
        },
        setProducts: function (products) {
            window.localStorage.setItem("products", angular.toJson(products));
        },
        getProductsFromLocal: function(){
            return angular.fromJson(window.localStorage.getItem("products"));
        }
    }
});