Why am I getting [] in the json response in postman always? - node.js

Question

// controllers/users.js
'use strict';
var mongoose = require('mongoose'),
User = mongoose.model('Users');
exports.list_all_users = function(req, res) {
User.find({}, function(err, users) {
if (err)
res.send(err);
res.json(users);
});
};
// exports.list_all_users = function(req, res){
// res.send("display all users");
// };
exports.create_a_user = function(req, res){
res.send("user_created");
};
exports.delete_a_user = function(req, res){
res.send("user_deleted");
};
./routes/users.js
'use strict';
module.exports = function(app) {
var users = require('../controllers/users');
// users Routes
app.route('/users')
.get(users.list_all_users);
}
model/UserModel.js
'use strict';
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var UserSchema = new Schema({
_id:{
type : Number,
auto : true },
name: {
type : String,
required: 'Kindly enter the name '
},
password: {
type: String
},
email:{
type: String,
required: 'Kindly enter the mailId '
},
role:{
type: String,
required : 'Enter a valid role '
},
invitedBy: {
type: Number,
required : 'Valid number'
}
});
module.exports = mongoose.model('Users', UserSchema);
server.js
var express = require('express'),
app = express(),
port = process.env.PORT || 3000,
mongoose = require('mongoose'),
User = require('./model/UserModel'), //created model loading here
bodyParser = require('body-parser');
// mongoose instance connection url connection
var dbConfig = require('./db');
mongoose.Promise = global.Promise;
mongoose.connect(dbConfig.config);
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
var userRoutes = require('./routes/users'); //importing route
userRoutes(app); //register the route
app.listen(port);
console.log('todo list RESTful API server started on: ' + port);
I tried printing 'display as respone' to response and it works, the database connection is successful.
But when I try to get from the db, it prints[] for /users get
I suspect something is wrong with my model
Can anyone point out what went wrong here ?
My collection:
collection : "Users"
{
"_id": 112,
"name": "abcd",
"password": "hash12341234",
"email": "questioner#hotmail.com",
"role": "musician",
"invitedBy": 1
}

Answer 1

In you controllers/user.js, you have tried to created a user model again. Can you try importing as follows,
var mongoose = require('mongoose'),
User = require('../model/UserModel')
In you userModel.js, you need to also place a connection string
var db = mongoose.connect("mongodb://localhost/XXXXX");
var Schema = mongoose.Schema;

Answer 2

You just need to replace a line in controller/user.js
Use:
User = require('../model/UserModel')
instead of:
User = mongoose.model('Users');
Hope this helps.

Answer 3

Actually, the issue is that, the get function is returning the objects in collection created only using the model in Node.
I tried creating the user with the api and tested get users but it works like charm.
I am still puzzled about why it is unable to return the objects from the collection which were created by me manually.