承诺拒绝不返回?

Promise reject not returning?

我正在使用 ember.js,simple auth token 包没有返回被拒绝的承诺时遇到问题,我不确定为什么。

我要解决的问题是,如果身份验证被拒绝,则显示一条错误消息,对于此示例,如果由于任何原因失败,我们甚至可以只显示一条硬编码消息。我看到的行为是控制台中出现了一些错误,但未显示任何消息。

POST http://localhost:8000/v1/auth/login/ 400 (BAD REQUEST)

undefined: _emberMetalLogger["default"].error(error.stack);

// my authenticate action
authenticate: function() {
   let store = this.container.lookup('store:main');
   let credentials = this.getProperties('identification', 'password'),
      authenticator = 'simple-auth-authenticator:token';
      let authPromise = this.get('session').authenticate(authenticator, credentials);

      authPromise.then(() => {
        console.log('inside authPromise');
        let userPromise = store.find('user', {username: credentials.identification});

        userPromise.then(user => {
            console.log("inside userPromise");
            store.find('store', {user: user.get('firstObject').get('id')}).then(function(store) {
                this.get('appController').set('myStore', store.get('firstObject'));
            });
        }, err => {
            console.log('in error block');
            this.set('errorMessage', 'Unable to login with the provided credentials');
        });
    });
}

我的身份验证操作触发,但它永远无法进入错误块,也无法到达 authPromise 内部。一旦它定义了 authPromise,错误就会发生,一切都会停止。我试过甚至在它周围放一个 try/catch,但我无法用那个 etiher 返回任何东西。我希望承诺拒绝并使用具有以下响应的第二个函数。

再深入一点,我想确保这个承诺被正确地拒绝了。在包中,身份验证功能被触发,它确实根据我在调试时输入的 console.log() 拒绝了承诺。它在拒绝中使用的 2 个变量也被定义了,所以我不确定我什么时候没有得到被拒绝的承诺。

// authenticate action in the ember-simple-auth-token package
authenticate: function(credentials) {
    var _this = this;
    return new Ember.RSVP.Promise(function(resolve, reject) {
      var data = _this.getAuthenticateData(credentials);
      _this.makeRequest(data).then(function(response) {
        Ember.run(function() {
          resolve(_this.getResponseData(response));
        });
      }, function(xhr) {
        Ember.run(function() {
          console.log('rejecting');
          reject(xhr.responseJSON || xhr.responseText);
        });
      });
    });
  },

根据 RSVP.js example,如果 authPromise 拒绝,那么您应该在 promise.catch() 而不是 promise.then():

中处理
authenticate() {
   let store = this.container.lookup('store:main');
   let credentials = this.getProperties('identification', 'password'),
      authenticator = 'simple-auth-authenticator:token';

    let authPromise = this.get('session').authenticate(authenticator, credentials);

    authPromise.then(() => {
      console.log('inside authPromise');
      let userPromise = store.find('user', {username: credentials.identification});

      userPromise.then(user => {
          console.log("inside userPromise");
          store.find('store', {user: user.get('firstObject').get('id')}).then(function(store) {
              this.get('appController').set('myStore', store.get('firstObject'));
          });
      }).catch(err => {
          console.log('in error block');
          this.set('errorMessage', 'Unable to login with the provided credentials');
      });
    }).catch(reason => {
      console.log('Inside authPromise.catch block');
      // put your logic here, maybe reason is defined
      console.log(reason);
    });
}