Angular $ q.reject().success(),这有意义吗？

Question

我正在读一本名为MEAN Machine的书,当我进入后期章节时,我已经陷入其中一个示例应用程序,这似乎不起作用.

问题似乎发生,因为我的mainController调用authService的Auth.getUser()方法,它可能返回a $http.get()或a $q.reject().由于我没有登录,它会返回$q.reject(),并且无法链接.success()承诺.

它抛出以下异常:

TypeError:undefined不是mainCtrl.js中的函数:13

我的代码如下.

---

CONTROLLER
mainController

angular.module('mainCtrl', [])
    .controller('mainController', function($rootScope, $location, Auth) {
        var vm = this;

        // check to see if a user is logged in on every request
        $rootScope.$on('$routeChangeStart', function () {
            vm.loggedIn = Auth.isLoggedIn();

            // get user information on route change
            Auth.getUser()

                /* ========= PROBLEM HERE ========= */
                .success(function (data) {
                    vm.user = data;
                });
        });

        // ... other stuff
    });

---

服务
authService

angular.module('authService', [])

    // ===================================================
    // auth factory to login and get information
    // inject $http for communicating with the API
    // inject $q to return promise objects
    // inject AuthToken to manage tokens
    // ===================================================
    .factory('Auth', function ($http, $q, AuthToken) {

        var authFactory = {};

        // get the user info

        /* ========= PROBLEM LEADS HERE ========= */

        authFactory.getUser = function () {
            if (AuthToken.getToken())
                return $http.get('/api/me', { cache: true });
            else {
                return $q.reject({ message: 'User has no token.' });
            }
        }

---

我错过了什么？

Answer 1

用以下内容替换您对服务的呼叫:

解决方案A .then(successCallback, errorCallback):

Auth.getUser().then(
    function (response) { ... },                // success handler
    function (response) {                       // error handler
        // case where user is not logged in
        // or http request fails
});

要么

解决方案B .then(successCallback).catch(errorCallback):

Auth.getUser()
    .then(function (response) { ... })         // success handler
    .catch(function (response) {               // error handler
        // case where user is not logged in
        // or http request fails
    });

说明:

您的getUser方法定义如下:

authFactory.getUser = function () {
    if (AuthToken.getToken())
        return $http.get('/api/me', { cache: true });
    else {
        return $q.reject({ message: 'User has no token.' });
    }
} 

但是success,error速记方法是特定的$http.它们不存在于angular的promise $qAPI中.因此,当用户没有登录时,因为您正在返回一个$q承诺,所以您得到了一个undefined is not a function.

您可以在$qpromise对象上调用的方法是(链接到文档):

• then(successCallback, errorCallback, notifyCallback)
• catch(errorCallback) 这是一个简写 promise.then(null, errorCallback)
• finally(callback, notifyCallback)