用户不是Express中带有Passport的构造函数

Question

我正在尝试使用passport.js实现Express注册，当我提交表单时，在服务器控制台上我得到:

POST /user/register 500 62.273 ms - 2008
TypeError: User is not a constructor
    at /mean-auth/server/routes/api.js:8:17

下面是错误的api.js文件:

var express = require('express');
var router = express.Router();
var passport = require('passport');
var User = require('../models/user.js');
router.post('/register', function(req, res) {
  User.register(new User({ username: req.body.username }),
    req.body.password, function(err, account) {
    if (err) {
      return res.status(500).json({
        err: err
      });
    }
    passport.authenticate('local')(req, res, function () {
      return res.status(200).json({
        status: 'Registration successful!'
      });
    });
  });
});
module.exports = router;

用户模型(user.js)如下图:

// user model
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var passportLocalMongoose = require('passport-local-mongoose');
var bcrypt = require('bcrypt');
var userSchema = mongoose.Schema({
  username: String,
  password: String
});
userSchema.plugin(passportLocalMongoose);
var User = mongoose.model('User', userSchema);
module.exports = {
  User: User
};
module.exports.createUser = function(newUser, callback){
    bcrypt.genSalt(10, function(err, salt) {
        bcrypt.hash(newUser.password, salt, function(err, hash) {
            newUser.password = hash;
            newUser.save(callback);
        });
    });
}
module.exports.getUserByUsername = function(username, callback){
    var query = {username: username};
    User.findOne(query, callback);
}
module.exports.getUserById = function(id, callback){
    User.findById(id, callback);
}
module.exports.comparePassword = function(candidatePassword, hash, callback){
    bcrypt.compare(candidatePassword, hash, function(err, isMatch) {
        if(err) throw err;
        callback(null, isMatch);
    });
}

和我也尝试了createUser方法和newUser对象:

var User = require('../models/user.js');
router.post('/register', function(req, res) {
  var username = req.body.username;
  var password = req.body.password;
  var newUser = new User({
    username: username,
    password: password
  });
  User.createUser(newUser, function(err, user){
    if(err) throw err;
    console.log(user);
  });
  passport.authenticate('local')(req, res, function () {
    return res.status(200).json({
      status: 'Registration successful!'
    });
  });
});

，但出现相同的错误。用户的定义有什么问题吗?

Answer 1

似乎您正在导出一个对象，其中包含User。

module.exports = {
  User: User
};

当导入该文件时，尝试这样做:

var User = require('../models/user.js').User;

Answer 2

在require语句中不需要.js扩展。

var User = require('../models/user');