Express + MongoDB

I try to connect an application to mongoDB with express, for the moment i have no problem with the collection users, it works perfectly but it doesn't work for my second collection, when i try to get all data of my second collection, express return me a empty array.

// Import dependencies
const mongoose = require('mongoose');
const express = require('express');
const router = express.Router();

// MongoDB URL from the docker-compose file
const dbHost = 'mongodb://database/mybase';

// Connect to data
mongoose.connect(dbHost);

// create mongoose schema
const userSchema = new mongoose.Schema({
    mail: String,
    mdp: String,
    firstname: String,
    participants: Number
});

// create mongoose schema
const roomSchema = new mongoose.Schema({
    roomId: String,
});

// create mongoose model
const User = mongoose.model('User', userSchema);
const Room = mongoose.model('Room', roomSchema);

/* GET api listing. */
router.get('/', function(req, res) {
    res.send('api works');
});

/* GET all users. */
router.get('/users', function(req, res) {
    User.find({}, function (err, users) {
        if (err) {
            res.status(500).send(error)
        }
        res.status(200).json(users);
    });
});

/* GET all rooms. */
router.get('/room', function(req, res) {
    Room.find({}, function (err, room) {
        if (err) {
            res.status(500).send(error)
        }
        res.status(200).json(room);
    });
});

module.exports = router;

In my mongo data are stored like this :

> db.users.find()
{ "_id" : ObjectId("5903a7ee0e999a5054cc402b"), "mail" : "mail@google.com", "mdp" : "toto", "firstname" : "firstname", "participants" : 100 }
{ "_id" : ObjectId("5903ae7952163fd952970ed5"), "mail" : "mail2@google.com", "mdp" : "toto", "firstname" : "firstname", "participants" : 50 }

> db.room.find()
{ "_id" : ObjectId("59043f280d062a4959b69315"), "roomId" : "6733454" }

I search for a long time but to be honest, i don't know why it doesn't work, i also try to put users data into room data and to copy/paste user schema into room schema, but it doesn't work also.

If i put the User model object in router.get room, it works, i get users data, so for me it's not a problem of route.

via djdelarue