CODEWITHSUNDEEP
node.jsmongodbexpressmongoose
djdelarue
djdelarue

Reputation: 113

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" : "[email protected]", "mdp" : "toto", "firstname" : "firstname", "participants" : 100 }
{ "_id" : ObjectId("5903ae7952163fd952970ed5"), "mail" : "[email protected]", "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.

Upvotes: 2

Views: 363

Answers (3)

djdelarue
djdelarue

Reputation: 113

Thanks you guys, it was just that and it was in front of me all this times...

It works perfect with collection rooms and not room

Upvotes: 0

Patrick Hund
Patrick Hund

Reputation: 20236

The problem is that the name of your collection is room, as in singular. The correct name for the collection is rooms, plural.

Mongoose infers from the model name Room that there should be a collection named rooms in the database. If there isn't, it just fails silently and returns an empty array.

If you simply change the name of your collection in the database from room to rooms, your code will work.

You can do so with the renameCollection command.

Upvotes: 2

robertklep
robertklep

Reputation: 203231

By default, Mongoose applies a function (utils.toCollectionName()) to the name of a model to determine the collection name that Mongoose will use for that model. For a model called Room, that collection name will be rooms.

However, your collection is called room (singular), so there's a mismatch there.

To fix this, you can explicitly specify which collection should be used using the collection schema option:

const roomSchema = new mongoose.Schema({
  roomId: String,
}, {
  collection : 'room'
});

Upvotes: 2

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