ExpressJS登錄驗證錯誤：comparePassword不是函式

在檔案夾backend/controllers我有一個authController類，它處理帶有電子郵件和密碼的 POST 請求，然后在資料庫中查找具有匹配電子郵件的用戶，然后當它找到用戶時，它會嘗試驗證密碼呼叫名為comparePassword的方法，在位于backend/models的用戶類中定義。

authController 類：

const User = require('../models/user');
const ErrorHandler = require('../utils/errorHandler');
const catchAsynErrors = require('../middlewares/catchAsyncErrors');
const sendToken = require('../utils/jwtToken');


// register user => /api/v1/register
exports.registerUser = catchAsynErrors(async (req, res, next)=> {
const { name, email, password} = req.body;

const user = await User.create({
    name,
    email, 
    password,
    avatar: {
        public_id: '',
        url: ''
    }
})

sendToken(user, 200, res)
})



// login user => /a[i/v1/login
exports.loginUser = catchAsynErrors(async(req, res, next)=> {
    const { email, password} = req.body;

    // checks if email  and password is entered by the user
    if(!email || !password){
        return next(new ErrorHandler('Please enter email & password', 400))
    }

    //finding user in database
    const user = await User.find( { email } ).select(' password')

    if(!user){
        return next(new ErrorHandler('Invalid Email or Password', 401))
    }
    
    // Attempting to print the user object's functions
    console.log(user.comparePassword); // undefined
    console.log(user.find); // [Function: find]
    
    //checks if password is correct or not 
    const isPasswordMatched = await user.comparePassword(password);
    
    if(!isPasswordMatched){
        return next(new ErrorHandler('Invalid Email or Password', 401))
    }
    sendToken(user, 200, res)   
});

用戶類：

const mongoose = require('mongoose');
const validator = require('validator');
const bcrypt = require('bcryptjs');
const jwt = require('jsonwebtoken');

const userSchema  = new mongoose.Schema({
name: {
    type: String,
    required: [true, 'Please enter your name'],
    maxLenght: [30, 'Your name cannot exceed 30 characters']
},
email:{
    type: String,
    required: [true, 'Please enter your email'],
    unique: true, 
    validate: [validator.isEmail, 'Please enter a valid email address']
}, 
password:{
    type: String,
    required: [true, 'Please enter your password'],
    minlenght: [6, 'Your password must have at least 6 characters'],
    select: false
},
avatar:{
    public_id: {
        type: String,
        required: true
    },
    url:{
        type: String,
        required: true
    }

},
role:{
    type: String,
    default: 'user'
},
createdAt:{
    type: Date,
    default: Date.now
},
resetPasswordToken: String,
    resetPasswordExpire: Date
})

//encrypting password before saving user
userSchema.pre('save', async function (next){
    if(!this.isModified('password')){
        next()
    }
    this.password = await  bcrypt.hash(this.password, 10)
})

// compare user password
userSchema.methods.comparePassword = async function (enteredPassword) {
    return await bcrypt.compare(enteredPassword, this.password)
}


// return jwt token 
userSchema.methods.getJwtToken = function (){
    return jwt.sign({ id: this._id }, process.env.JWT_SECRET, {
        expiresIn: process.env.JWT_EXPIRES_TIME
    });
}
module.exports = mongoose.model('User', userSchema);

這是我嘗試使用Postman發出 POST 請求時得到的結果 ，以及控制臺（在本例中，通過 VS Code 終端）在嘗試 console.log 函式時顯示的結果 comparePassword 和函式 find ，兩者屬于同一類。

郵差：

{
    "success": false,
    "error": {
        "statusCode": 500
    },
    "errMessage": "user.comparePassword is not a function",
    "stack": "TypeError: user.comparePassword is not a function\n    at D:\\pruebas de programación\\Proyectazo\\backend\\controllers\\authController.js:47:42\n    at processTicksAndRejections (node:internal/process/task_queues:96:5)"
}

安慰：

PS D:\pruebas de programación\Proyectazo> npm run dev
npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead.

> proyectazo@1.0.0 dev
> SET NODE_ENV=DEVELOPMENT& nodemon backend/server

[nodemon] 2.0.19
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json  
[nodemon] starting `node backend/server.js` 
Server started on PORT: 4000 in DEVELOPMENT mode. 
MongoDB Database connected with HOST: localhost
undefined
[Function: find]

我已經按照本教程https://www.youtube.com/watch?v=_zXBZS6E-jM&list=PLkVd4_IMjZgkwcXwnpy7tenGNBbRdiRO8&index=27做到了這一點，它似乎在視頻中完美運行。我查找了其他解決方案，其中一些甚至在 StackOverflow 中，它們看起來都像我所擁有的相同實作的變體或重構。有任何想法嗎？

提前致謝！

uj5u.com熱心網友回復：

它不起作用的原因是因為在 loginUser 函式中

//finding user in database
    const user = await User.find( { email } ).select(' password')

user是一個陣列。而是使用 Use.findOne() 方法

// This will return single user object
        const user = await User.findOne( { email } ).select(' password')

標籤：javascript 节点.js 表示 验证 后端

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