How to pass a value to parent in the constructor?

Question

JavaScript

The parent class that cannot accept model in any way, or rather, the console shows that this.model exists for itself and has all the functions with mongo

function MainController(model) {
        this.model = model;
        console.log(this.model);
    }
    MainController.prototype.findAll = function(req, res) {
            this.model.find({}, function (err, results) {
                if (err)  res.json({"findAll": err});
                res.json(results);
            });
    };
    MainController.prototype.findById = function(req,res) {
        var id = new ObjectID(req.params.id)
        this.model.findById(id, function (err, results) {
            if (err)  res.json({"findById":err});
            res.json(results);
        })
    };
    MainController.prototype.create = function(req, res){
            var saver = new this.model(req.body);
            saver.save(function(err,results, affected){
                if (err) throw  err;
                res.json({'create':'yes'});
            });
    };


module.exports = MainController;

Descendant

var util = require('util');
var User = require('../models/user').User;
ObjectID = require('mongodb').ObjectID;
var MainController = require('./index');
function UserController  () {
    MainController.call(this,User);
    this.model = User;
};
util.inherits(UserController, MainController);
UserController.prototype.checkAuth =  function(req, res, next){
    if (req.session.user) {
        res.json({"login": req.session.user});
    }
    else{
        next();
    }
};
UserController.prototype.login = function(req, res, next){
        var mail = req.body.mail;
        var password  = req.body.password;
        model.autorize(mail,password,function(err, result, user){
                if (result.login == 'yes'){
                    req.session.user = user._id;
                    res.json(result);
                }
                else{
                    res.json({"login":"no"});
                }
            }
        )

};

module.exports =  UserController;

var UserController = require('../controllers/user');
var userController = new UserController();
var uploader =   require('../single/fileTransfer') ;
module.exports = function(app) {
app.get('/users',userController.findAll);

This is where he complains

TypeError: Cannot call method 'find' of undefined
at MainController.findAll (/home/azureuser/test/controllers/index.js:7:24)
at Layer.handle [as handle_request] (/home/azureuser/test/node_modules/ express/lib/router/layer.js:82:5)
at next (/home/azureuser/test/node_modules/express/lib/router/route.js:110:13)
at Route.dispatch (/home/azureuser/ test/node_modules/express/lib/router/route.js:91:3)
at Layer.handle [as handle_request] (/home/azureuser/test/node_modules/express/lib/router/layer.js:82:5)
at /home/azureuser/test/node_modules/express/lib/router/index.js:267:22
at Function.proto.process_params (/home/azureuser/test/node_modules/express/lib/router/index.js:321 :12)
at next (/home/azureuser/test/node_modules/express/lib/router/index.js:261:10)
at /home/azureuser/test/node_modules/express-session/index.js:421:7
at /home /azureuser/test/node_modules/connect-mongo/lib/connect-mongo.js:295:11

But why? why does the console then say that the User was transferred and how to solve the problem

Answer 1

I wouldn't be surprised if this replaces express. In general, the express documentation recommends closing midleware

MainController.prototype.findAll = function() {
  var self = this;
  return function (req, res) {
    self.model.find({}, function (err, results) {
      if (err)  res.json({"findAll": err}); 
        res.json(results); // вы забыли else, здесь будет ошибка повторной отправки данных!
     });
   }
};
/* -------------- */
app.get('/users', userController.findAll());