关注点分离（服务层和路由器层）

Question

我想提高我在 Node JS 方面的技能。现在我对如何清晰地分离应用程序的服务层和路由器层感兴趣，这样我就可以避免代码重复之类的事情。
以用户方案的create method为例。

在UserService.Js 中，我为此存储了以下方法：

function createUser(req, res, next) {

  let user = new User({
    userID: req.body.userID,
    userName: req.body.userName,
    password: req.body.password,
    isAdministrator: req.body.isAdministrator
  });
  user.save().then(function() {
    res.send(user);
  }).catch(err => {
    console.log(err);
  });

}

以下代码存储在UserRouter.Js：

router.post('/publicUser', userService.createUser)

代码有效，但关注点分离没有得到尊重。 如何现在用回调函数编写创建函数？

我的尝试如下所示：

UserService.js  

function createUser() {

  let user = new User
  return user;
}

UserRoute.js    

    router.post('/publicUser',function(req,res,next){
  let newOne=userService.createUser()
  newOne.userID=req.body.userID
  newOne.userName=req.body.userName
  newOne.password=req.body.password
  newOne.isAdministrator=req.body.isAdministrator
  newOne.save().then(function() {
        res.send(newOne);
      }).catch(err => {
        console.log(err);
      })})

它有效。但是是否存在更优雅的方式？

Answer 1

以下是让您了解实现的代码。您可以根据复杂性和要求进一步增强。

UserRouter.Js

// import service here
router.post('/publicUser', createUser)

async function createUser(req, res, next) {
    try {
        const response = await UserService.createUser(req.body);
        res.send(response); // Enhance 'res' object here and return as per your requirement.
    } catch (error) {
        // log error
        res.status(500).send(''); // Enhance 'res' object here with error and statuscode and return as per your requirement.
    }
}

UserService.Js

async function createUser(body) {
    // check emptiness if any for body and throw proper errors.
    let userModelData = UserModel.getUserInsertPayload(body);
    return UserRepository.save(userModelData);
}

UserRepository.js

// all code related to persistance. This is separate layer.
async function save(user) {
    // Do any enhancement you need over the payload.
    return User.save(user);
}

UserModel.js

// import User here. Create a payload related to User specific requirements.
function getUserInsertPayload(body) {
    return new User({
        userID: req.body.userID,
        userName: req.body.userName,
        password: req.body.password,
        isAdministrator: req.body.isAdministrator
    });
}