I am following the passport.js doc in order to create a LocalStrategy using Sequelize as ORM for my postgres database. However, during authentification, doing User.findOne(...).success(function(user){...]}); in my login.js module returns undefined. What am I doing wrong?

user.js:

var pg = require('pg');

var Sequelize = require('sequelize');



var sequelize = new Sequelize('database', 'username', 'password', {

    host: 'localhost',

    port: 5432,

    dialect: 'postgres'

});



var User = sequelize.define('users', {

    username: Sequelize.STRING,

    password: Sequelize.STRING



});



User.sync();



module.exports = User;

my login.js (router)

var express = require('express');

var router = express.Router();

var passport = require('passport');

var LocalStrategy = require('passport-local').Strategy;





passport.serializeUser(function(user, done){

    done(null, user.id);

});



passport.deserializeUser(function(id, done){

    console.log(id)

    User.findById(id, function(err, user){

        done(err, user);

    });

});



passport.use(new LocalStrategy(

    function(username, password, done){

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

        User.find({where:{username: username, password: password}}).success(function(user){

            if(!user) {

                return done(null, false, {message: 'Nom d'usager incorrect.' });

            }

            if (!user.validPassword(password)) {

                return done(null, false, { message: 'Mot de passe incorrect.' });

            }

            return done(null, user);

        });

    }

));



router.post('/login', passport.authenticate('local', { successRedirect: '/decoupage',

                                                       failureRedirect: '/login',

                                                       failureFlash: true })

);





module.exports = router;