Question

我使用Laravel开发了一个系统，现在我想将同一个系统迁移到NodeJS。在Laravel我使用的是存储库模式（this library），所以我有这个方案：

routes =＆gt; controller =＆gt; service =＆gt; repository =＆gt; （雄辩）模型

好吧，我见过一些可以帮助我完成任务的库（awilix，sequelize），但我有些疑惑。

我用这种方式构建文件夹：

/server.js
/lib/config
/lib/routes
/lib/controllers
/lib/models
/lib/services

如果我正在构建一个巨大的应用程序（系统将拥有超过100个实体），我想要一些见解。

其他问题，我没有通过awilix使用Dependency Injection，所以我尝试了一些手动，但每次我使用DepartmentController就像一个类，我得到了这个错误：

Route.get() requires a callback function but got a [object Undefined]

server.js

const express = require('express');
const app = express();
app.use(express.static(path.join(__dirname, 'public')));
const routes = require('./lib/routes/index'); // Rotas
app.use('/', routes);

LIB /控制器/ index.js

const departmentController = require('./DepartmentController');
module.exports = {
   departmentController
};

LIB /控制器/ DepartmentController.js

const Department = require('../models').Department;
const DepartmentService = require('../services/DepartmentService').DepartmentService;

module.exports = class DepartmentController {
  list(req, res) {
    return Department
      .all()
      .then(data => res.status(200).send(data))
      .catch(error => res.status(400).send(error));
  }
}

LIB /路由/ index.js

const routes = require('express').Router();
const department_routes = require('./DepartmentRoute');
routes.use('/api', department_routes);
module.exports = routes;

LIB /路由/ DepartmentRoute.js

const router = require('express').Router();
const departmentController = require('../controllers').departmentController;

router.route('/departments').get(departmentController.list);  
module.exports = router;

LIB /模型/ Department.js

var Sequelize = require('sequelize');
module.exports = (sequelize, DataTypes) => {
  var Department = sequelize.define('Department', 
  { 
    // sequelize options and database fields, working fine
  }
  return Department;
};

LIB /服务/ DepartmentService.js

const Department = require('../models').Department;

module.exports = class DepartmentService 
{
  constructor({ Department }) {
    this.departments = Department
  }

  findAll() {
    return this.departments.all();
  }
}

Answer 1

您在此处定义类：lib / controllers / DepartmentController.js

但是该类的方法不是静态的。所以您需要创建一个实例。

您应该在lib / routes / DepartmentRoute.js中执行此操作：

const router = require('express').Router();
const DepartmentController = require('../controllers').departmentController;

const departmentController = new DepartmentController();

router.route('/departments').get(departmentController.list);  
module.exports = router;

如何在NodeJS中使用存储库模式和依赖注入？

1 个答案: