没有Sequelize实例通过

Question

我试图从我的dbController外包我的dbInit函数模型，因为我有几个模型使dbController变大。

所以我从我的initDb调用db_controller.js看起来像这样（我使用那个文件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中的用户看起来像这样：

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()
  })
}

和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()
  })
}

所以当我尝试通过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)

非常感谢你提前的建议！

Answer 1

我认为你在选项中传递seq而不是sequelize是很奇怪的。

检查这里的文档http://docs.sequelizejs.com/我在示例中看到他们通过属性sequelize而不是seq。

所以我建议改变：

{
  seq: sequelize,
  modelName: 'subject'
}

至

{
  sequelize: sequelize,
  modelName: 'subject'
}