UnhandledPromiseRejectionWarning:在猫鼬中未定义

时间:2018-09-26 18:21:42

标签: javascript node.js mongoose promise

当尝试使用Mongoose验证用户身份时,我在控制台中收到以下警告:

(node:20114) UnhandledPromiseRejectionWarning: undefined (node:20114) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:20114) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

尝试跟踪堆栈不会产生任何结果,我得到的只是undefined。这里在Stackoverflow上也存在类似的问题,但它们不适用于我的情况。知道这可能会导致什么吗?

我的路由控制器正在Mongoose模型内调用findByCredentials函数:

控制器

static login(req, res) {
    User.findByCredentials(req.body.email, req.body.password)
      .then(user => {
        return user.generateAuthToken().then(token => {
          res.header("x-auth", token).json(user);
        });
      })
      .catch(error => {
        res.status(400).json({ message: "Invalid credentials." });
      });
  }

模型

userSchema.statics.findByCredentials = function(email, password) {
  return this.findOne({ email }).then(user => {
    if (!user) {
      Promise.reject();
    }
    return new Promise((resolve, reject) => {
      bcrypt.compare(password, user.password, (err, res) => {
        res ? resolve(user) : reject();
      });
    });
  });
};

1 个答案:

答案 0 :(得分:1)

错误undefined来自您的Promise.reject(),您没有向其传递任何错误消息,因此实际上是抛出未定义的错误消息。

由于您不是通过findByCredentials方法返回它,因此没有被登录时捕获。

解决方案:

userSchema.statics.findByCredentials = function(email, password) {
    return this.findOne({ email }).then(user => {
        if (!user) {
            return Promise.reject('User not available');
        }

        return new Promise((resolve, reject) => {
            bcrypt.compare(password, user.password, (err, res) => {
                res ? resolve(user) : reject();
            });
        });
    });
};