类型错误：user.comparePassword 不是函数

Question

我不知道为什么我会收到此错误。类型错误：user.comparePassword 不是函数。

我安装了所有依赖项。将APP链接到所有图书馆。我尝试使用 Postman 检索数据，但它不起作用。我究竟做错了什么？

{
  "name": "e-commerce",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node server.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bcrypt-nodejs": "0.0.3",
    "body-parser": "^1.15.2",
    "connect-mongo": "^1.2.1",
    "cookie-parser": "^1.4.3",
    "ejs": "^2.4.2",
    "ejs-mate": "^2.3.0",
    "express": "^4.14.0",
    "express-flash": "0.0.2",
    "express-session": "^1.14.0",
    "mongoose": "^4.5.3",
    "morgan": "^1.7.0",
    "passport": "^0.3.2",
    "passport-local": "^1.0.0"
  }
}


var express = require('express');
var morgan = require('morgan');
var mongoose = require('mongoose');
var bodyParser = require('body-parser');
var ejs = require('ejs');
var engine = require('ejs-mate');
var session = require('express-session');
var cookieParser = require('cookie-parser');
var flash = require('express-flash');
var MongoStore = require('connect-mongo/es5')(session);
var passport = require('passport');



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


var app = express();

mongoose.connect(secret.database, function(err){
  if (err) {
    console.log(err);
  } else {
    console.log("Connected to database");
  }
});
//Middleware
//add how to use static page
app.use(express.static(__dirname + '/public'));
app.use(morgan('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));
app.use(cookieParser());
app.use(session({
  resave: true,
  saveUninitialized: true,
  secret: secret.secretKey,
  store: new MongoStore({url: secret.database, autoReconnect: true})
}));


app.use(flash());
app.use(passport.initialize());
app.use(passport.session());

app.engine('ejs', engine);
app.set('view engine', 'ejs');


var mainRoutes = require('./routes/main');
var userRoutes = require('./routes/user');
app.use(mainRoutes);
app.use(userRoutes);

app.listen(secret.port, function(err){
  if(err) throw err;
  console.log("Server running on port " + secret.port);
});




var passport = require('passport');
var localStrategy = require('passport-local').Strategy;
var User = require('../models/user');


passport.serializeUser(function(user, done){
  done(null, user._id);
});



passport.deserializeUser(function(id, done){
  User.findById(id, function(err, user){
    done(err, user);
  });
});


//middlewear

passport.use('local-login', new localStrategy({
  usernameField: 'email',
  passwordField: 'password',
  passReqToCallback: true
}, function(req, email, password, done){
  User.find({email: email}, function(err, user){
    if (err) return done(err);

    if(!user) {
      return done(null, false, req.flash('loginMessage', 'No user has been found'));
    }

    if(!user.comparePassword(password)){
      return done(null, false, req.flash('loginMessage', 'Opps! Wrong Password Pal'));
    }


    return done(null, user);
  });
}));

//custom function to validate
exports.isAuthenticated = function(req, res, next){
  if( req.isAuthenticated()) {
    return next();
  }
  res.redirect('/login');
};

Answer 1

到底是什么.comparePassword？

你User从./models/user.js（我假设它是一个mongo模型，但我们看不到它）得到，然后你调用.find（如果它真的是Mongo，它应该返回一个数组，对于你应该使用的一个结果.findOne），然后你得到user变量中的结果并尝试为你的结果调用一些方法.comparePassword()，在你的情况下肯定是undefined......

console.log(user)尝试在之前添加user.comparePassword，您将确切地看到您得到的内容。