Question

I am working on a nodejs app.

Folder structure is

app
app.js
package.json
../model/schema.js
../controller/controller.js
../views

All the logic is in controller.js while app.js performing routing itself….

I want to know how to get/return data(object) from controller.js to app.js.

I am using ‘return’ to send mongodb document from controller to app but its undefined.

Heres code of app.js..i have removed unneccessary code

  var express = require('express'),
   app = express.createServer(express.logger()),
   io = require('socket.io').listen(app),
   routes = require('./routes');
   var controller=require('./controller/controller');
   var model=require('./model/schema');

   app.get("/", function(req, res) {
     res.render("chatroom.html");
    });

   io.sockets.on('connection', function (socket) {
      socket.on('login',function(user)
      {
          var onliner=controller.loginUser(user);
          console.log("Onlinersss: ",onliner);
      });

      socket.on('registerUser',function(user){
          controller.registerUser(user);
      });
   });

Heres controller.js code:

  var model=require('../model/schema');
  exports.loginUser=function(user)
  {

      model.registerUser.findOne({uname:user.uname,pass:user.pass},function(err,doc){
        if(!err){ 
             console.log("Here loggedin: ",doc); 
             return doc;             
        }
        else
             console.log("Invalid username or password");
        });
  };

Answer 1

I’ve just pushed a project to GitHub that uses pretty much the same libraries and RethinkDB as the database (very similar to MongoDB). Basically you need to pass callbacks to your controller and have them invoked with the data retrieved from the DB. Take a look at app.js and lib/db.js in the linked project.