AngularJs无法读取未定义的属性“ then”

Question

我有一个包含以下功能的authenticationService：

//this.userApi = Restangular.service('api/sessions');

login(user) {
    let that = this;

    this.userApi.post(user).then(function(user) {
        that.session.create(user.sessionId, user.userId, user.username);
        return user;
    });
}

在我的控制器中：

login() {
    this.authService
        .login(that.user)
        .then(function(user) {
            $scope.setCurrentUser(user);

        },
        function(result) {
            console.log('fail', result.status);
        });
}

我不明白为什么我在这行上得到``无法读取未定义的属性'then'''： that.authService.login(that.user).then(function (user) ...

Answer 1

在第一个代码段中，您需要返回promise，以便可以继续在其他代码段中使用链。

//this.userApi = Restangular.service('api/sessions');

login(user) {
    let that = this;

    return this.userApi.post(user).then(function(user) {
        that.session.create(user.sessionId, user.userId, user.username);
        return user;
    });
}

Answer 2

您应该尝试这样：

//this.userApi = Restangular.service('api/sessions');

login(user) {
    let that = this;

   return this.userApi.post(user).then(function(user) {
        that.session.create(user.sessionId, user.userId, user.username);
        return user;
    });
}