How to get MongoClient object from Mongoose? - mongodb

Question

I have to get the MongoClient object from mongoose connection object, so that I can reuse for Agenda or somewhere else where I need.
db.js
// Export the mongoose instance
module.exports = () => {
mongoose.Promise = global.Promise;
try {
console.log('DBURL:', dbConfig.url);
const { url, options } = dbConfig;
mongoose
.connect(url, options)
.then(() => console.log('DB Connected'), err => console.log(err, options));
mongoose.connection.on('connected', () => {
logger.log('info', 'Mongoose default connection opened');
});
mongoose.connection.on('error', (err) => {
// logger.log('error', 'Couldn't able to connect to MongoDB', err);
// Blow system on db error
logger.log('info', 'Mongoose default connection opened');
throw err;
});
mongoose.connection.on('reconnected', () => {
logger.log('info', 'Mongo connection reconnected', arguments);
});
mongoose.connection.on('disconnecting', () => {
logger.log('error', 'Mongoose connection disconnecting', arguments);
});
mongoose.connection.on('disconnected', () => {
logger.log('error', 'Mongoose connection disconnected', arguments);
});
} catch (e) {
console.log("Couldn't connect to mongo:", e);
}
return mongoose;
};

Answer 1

You can get the mongoClient with getClient() method as shown in the docs: getClient()
Basically you need to do something like this
const client = mongoose.connection.getClient()
So to use it with connect-mongo for example you could just export that from your db.js then import and use where needed.
//db.js
module.exports.client = mongoose.connection.getClient()
//app.js
const { client } = require('path to file')
const store = MongoStore.create({ client })

Answer 2

const mongoose = require("mongoose");
let options = { //Your options };
const mongoClient = new mongoose.mongo.MongoClient(URI, options)

Answer 3

config = require('./configs');
mongoose = require('mongoose');
module.exports = function() {
var db = mongoose.connect(config.db, config.mongoDBOptions).then(
() => {
console.log('MongoDB connected')
},
(err) => {
console.log('MongoDB connection error',err)
}
);
require('../app/models/xxx.server.model');
require('../app/models/yyy.server.model');
return db;};

Answer 4

You may get MongoClient Object by following this method:
const { MongoClient, ObjectID } = require('mongodb');
function(req, res) {
(async function mongo() {
let client;
try {
client = await MongoClient.connect(url, {useNewUrlParser: true});
debug('Connected correctly to server');
const db = client.db(dbName);
}