node.js - Sequelize - 无法读取未定义的属性 'define'

Question

我正在尝试使用 sequelize 向 MYSQL 表中插入一条记录。

已安装 sequelize 和 mysql。

npm install --save sequelize

npm install --save mysql

在 app.js 中定义

var Sequelize = require('sequelize');

db.js

var Sequelize = require('sequelize');

var sequelize = new Sequelize('randomdb', 'root', 'root', {
    host: 'localhost',
    dialect: 'mysql',
    port : 8889,

    pool: {
        max: 5,
        min: 0,
        idle: 10000
    }
});

exports.sequelize = sequelize;
module.exports = Sequelize;

路由/index.js

var express = require('express');
var router = express.Router();
var sequelize = require('../db').sequelize;

/* GET home page. */
router.get('/', function (req, res, next) {
    res.render('index', {title: 'Express'});
});

router.get('/adduser', function (req, res) {
    var User = sequelize.define('users', {
        first_name: Sequelize.STRING
    });

    sequelize.sync().then(function () {
        return User.create({
            first_name: 'janedoe'
        });
    }).then(function (jane) {
        console.log(jane.get({
            plain: true
        }))
    });
});

module.exports = router;

这是错误。

Cannot read property 'define' of undefined

TypeError: Cannot read property 'define' of undefined

缺少什么？

编辑 2

db.js

var Sequelize = require('sequelize');

var sequelize = new Sequelize('randomdb', 'root', 'root', {
    host: 'localhost',
    dialect: 'mysql',
    port: 8889,

    pool: {
        max: 5,
        min: 0,
        idle: 10000
    },
    define: {
        timestamps: false
    }
});

var db = {};

db.sequelize = sequelize;
db.Sequelize = Sequelize;

module.exports = db;

模型/user.js

var db = require('../db'),
    sequelize = db.sequelize,
    Sequelize = db.Sequelize;

var User = sequelize.define('random', {
    first_name: Sequelize.STRING
});

module.exports = User;

路由/index.js

var express = require('express');
var router = express.Router();
var db = require('../db'),
    sequelize = db.sequelize,
    Sequelize = db.Sequelize;

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

router.get('/adduseryes', function (req, res) {
    sequelize.sync().then(function () {
        return User.create({
            first_name: 'janedoe'
        });
    }).then(function (jane) {
        res.send("YES");
    });
});

module.exports = router;

Answer 1

在您的 db.js 文件中，您正在用 Sequelize var 覆盖 exports 变量。在 node.js 中，module.exports == exports。试试这个:

var Sequelize = require('sequelize');

var sequelize = new Sequelize(...);

var db = {};

db.sequelize = sequelize;
db.Sequelize = Sequelize;

module.exports = db;

然后，您可以将 routes/index.js 中的导入修改为如下:

var db = require('../db'),
  sequelize = db.sequelize,
  Sequelize = db.Sequelize;