node.js - 未捕获、未指定的 "error"事件

Question

我在尝试使用 postman 登录时遇到此错误“未捕获，未指定的“错误”事件。(参数不正确)”。请帮我找出不正确的论点。

这是我的代码:

router.post('/login', function(req, res) {
  User.findOne({
    username: req.body.username
  })
  .select('password')
  .exec(function(err, user) {

    console.log('err', err); // err is null

    if (err) throw err;

    if (!user) {
      res.status(404).send({message: 'User does not exist!'})
    }
    else if (user) {
      var validPassword = user.comparePassword(req.body.password);

      if (!validPassword) {
        res.status(401).send({message: 'Invalid Password'});
      }
      else {
        var token = createToken(user);
        res.json({
          success: true,
          message: 'Successfully login!',
          token: token
        })
      }
    }
  })

})

确切的错误:
events.js:165
throw err;
^
Error: Uncaught, unspecified "error" event. (Incorrect arguments)
at Function.emit (events.js:163:17)
at Immediate.<anonymous> (..../node_modules/mongoose/lib/query.js:2322:23)
at runCallback (timers.js:574:20)
at tryOnImmediate (timers.js:554:5)
at processImmediate [as _immediateCallback] (timers.js:533:5)


我正在使用:

• Node 6.6.0
• Mongoose 4.7.5
• MongoDB 2.4.9

Answer 1

找到导致错误的原因，它来 self 的其他代码，这是因为我使用箭头函数而不是匿名函数。

// don't use arrow function if you want to access the this keyword
UserSchema.methods.comparePassword = (password) => {
  var user = this;

  return bcrypt.compareSync(password, user.password);
}

// use anonymous function instead
UserSchema.methods.comparePassword = function(password) {
  var user = this;

  return bcrypt.compareSync(password, user.password);
}