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Question

我正在开发一个涉及将用户注册到mongodatabase的项目。

我将Mongoose Schema放在一个名为user.js的文件中，这里是代码：

const express = require('express');
const mongoose = require('mongoose');
const bcrypt = require('bcrypt');
const passportLocalMongoose = require('passport-local-mongoose');

let Schema = mongoose.Schema;


let UserSchema = Schema({
  name: {
    type: String
  },

  username: {
    type: String,
    unique: true,
    required: true
  },

  profilePic: {
    type: String
  },

  email: {
    type: String,
    unique: true,
    required: true
  },

  password: {
    type: String,
    required: true,
  },

  usersRecipes: [{type: Schema.Types.ObjectId, ref:'Recipe'}],

  userComments: [{type: Schema.Types.ObjectId, ref: 'Recipe'}]

});

let User = mongoose.model('User', UserSchema);

module.exports = User;

我这里是我的文件userRouter.js的代码，我的代码不能正常工作

const express = require('express');
const passport = require('passport');
const User = require('../models/user');
const jwt = require('jsonwebtoken');
const mongoose = require('mongoose');
const bcrypt = require('bcrypt');


router = express.Router();

router.get('/', (req, res, next) => {
    res.send('Here are the users!')
});

router.get('/:username', (req, res, next) => {
    let nameQuery = {username: req.params.username};

    User.findOne(nameQuery, (err, user) =>{
        if (err) throw err;
        res.json(user);

    })
});

router.post('/register', function(req, res, next, err){

    User.create({
        username: req.body.username,
        password: req.body.password,
        name: req.body.name,
        email: req.body.email,
        profilePic: req.body.profilePic
    }, (err, user) => {
        if (err) return err;

        res.json(user);
    }); 
});
module.exports = router;

每次我尝试在邮递员中添加用户时，都会收到以下错误：

这是我的app.js文件：

let express = require('express');
let mongoose = require('mongoose');
let path = require('path');
let bodyParser = require('body-parser');
let recipeRouter = require('./routes/recipeRouter');
let userRouter = require('./routes/userRouter');
let bcrypt = require('bcrypt');
let passport = require('passport');
let LocalStrategy = require('passport-local').Strategy;
let config = require('./config');

mongoose.connect(mongodb://localhost:27017);

let db = mongoose.connection;

db.on('error', console.error.bind(console, 'connection error:'));

db.once('open', function () {
    // we're connected!
    console.log("Connected correctly to server");
});

const app = express();

const port = 3000;

app.listen(port);


app.use(express.static(path.join(__dirname, 'public')));

app.use(bodyParser.json());

app.set('views', path.join(__dirname, 'views'));

app.use('/users', userRouter);
app.use('/recipes',recipeRouter);

app.get('/', function(req, res){
  res.send('Hey, this is your database!')
});


module.exports = app;

我做错了什么？

Answer 1

这是问题所在：

router.post('/register', function(req, res, next, err) { ... })

具体来说，是第四个err参数。传递一个带有4个参数的函数对Express具有内部意义，这意味着该函数是一个错误处理程序，在这种情况下它不是。

请改用：

router.post('/register', function(req, res, next) { ... })

此外，稍后您的代码：

if (err) return err;

您可能想要抛出该错误（或致电return next(err)）。