没有通过Sequelize实例

时间:2019-04-20 16:10:40

标签: node.js sequelize.js

我正在尝试从dbController外包dbInit函数的模型,因为我有多个模型使dbController变大。

所以我正在从initDb呼叫db_controller.js,它看起来像这样(我使用了文档http://docs.sequelizejs.com/manual/getting-started.html

const userModel = require('../model/user')
const subjectModel = require('../model/subject')
const Sequelize = require('sequelize')
const seq = new Sequelize({
  dialect: 'sqlite',
  storage: './user.db'
})

async function initDb () {
  await userModel.user.initUser()
  await subjectModel.subject.initSubject()
  userModel.user.userClass.hasMany(subjectModel.subject.subjectClass)
}

user.js中的用户如下:

const Sequelize = require('sequelize')
const seq = new Sequelize({
  dialect: 'sqlite',
  storage: './user.db'
})

class User extends Sequelize.Model {
}

exports.user = {
  initUser: initUser,
  userClass: User
}

async function initUser () {
  return new Promise(resolve => {
    User.init(
      // attributes
      {
        firstName: {
          type: Sequelize.STRING,
          allowNull: false
        },
        lastName: {
          type: Sequelize.STRING,
          allowNull: false
        },
        email: {
          type: Sequelize.STRING,
          allowNull: false
        }
      },
      // options
      {
        seq,
        modelName: 'user'
      }
    )
    resolve()
  })
}

subject.js

几乎相同
const Sequelize = require('sequelize')
const sequelize = new Sequelize({
  dialect: 'sqlite',
  storage: './user.db'
})

class Subject extends Sequelize.Model {
}

exports.subject = {
  initSubject: initSubject,
  subjectClass: Subject
}

async function initSubject () {
  return new Promise(resolve => {
    Subject.init(
      // attributes
      {
        name: {
          type: Sequelize.STRING,
          allowNull: false
        }
      },
      // options
      {
        seq: sequelize,
        modelName: 'subject'
      }
    )
    resolve()
  })
}

因此,当我尝试通过node db_controller.js

执行此操作时

我收到此错误(缩短)

(node:12444) UnhandledPromiseRejectionWarning: Error: No Sequelize instance passed
    at Function.init (D:\Git\ppb\node_modules\sequelize\lib\model.js:915:13)
    at resolve (D:\Git\ppb\src\model\user.js:26:10)
    at new Promise (<anonymous>)
    at Object.initUser (D:\Git\ppb\src\model\user.js:25:10)
    at initDb (D:\Git\ppb\src\controller\db_controller.js:18:24)
    at Object.<anonymous> (D:\Git\ppb\src\controller\db_controller.js:45:1)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)

非常感谢您提前提出任何建议!

2 个答案:

答案 0 :(得分:1)

我认为您在选项中传递seq而不是sequelize很奇怪。

http://docs.sequelizejs.com/处检查文档在示例中,我看到它们传递了属性sequelize而不是seq

所以我建议更改:

{
  seq: sequelize,
  modelName: 'subject'
}

{
  sequelize: sequelize,
  modelName: 'subject'
}

答案 1 :(得分:1)

import database from 'path/some*.ts';

这是我在 express app.ts 中使用时的 init 数据库文件;同样在这个数据库文件中,我导出了 sequelize 实例;

import User from '../some/model/define/file';

数据库导入Sequelize后可以自动同步定义到模式,模型如下:

Class User extends Model {...} 
User.define(...);
User.has or many();

这样可以解决问题:sequelize instance error。

点:在你的续集参考顺序后面!!!!