MongoDB | Node.js Connection Pooling w/ module.exports -

hey guys i'm pretty new creating modules, i'm having bit of trouble accessing mongodb connection pool main application.

here's module:

// mongo-pool.js // -------------  var assert = require('assert'); var mongodb = require('mongodb'); var mongoclient = mongodb.mongoclient; var url = 'connection_url';  var mongopool = {     start: function() {         mongoclient.connect(url, function(err, db) {             assert.equal(null, err);             console.log("successfully connected mongo");              // make db object accessible here?          });     }  }  module.exports = mongopool; 

when require mongo-pool.js , call mongopool.start() says connected mongo, although db object not accessible make queries. here main js file:

var mongopool = require('./mongo-pool.js'); var pool = mongopool.start();   var collection = pool.db.collection('accounts'); collection.update(     { _id: 'diynaiis' },     { $push: { children: 'julian' } } ) 

the variable pool undefined. can't seem figure out why, i've tried return db in module, didn't seem work.

any appreciated, thank you!

a buddy of mine helped me figure out problem was, here's solution incase runs it.

i updated mongo-pool.js module , assigned db property itself:

var assert = require('assert'); var mongodb = require('mongodb'); var mongoclient = mongodb.mongoclient; var url = 'my_database_url';  var mongopool = { start: function() {     mongoclient.connect(url, function(err, db) {         assert.equal(null, err);          var self = this;         self.db = db;         // these assignments          console.log("successfully connected mongo");          // make db object accessible here?      }); }  }  module.exports = mongopool; 

then in main.js file:

var mongopool = require('./mongo-pool.js'); // include mongo global module  new mongopool.start(); // initialize new mongodb object globally  settimeout(function() {     console.log(db); }, 3000); // set 3 second timeout before testing db object... // return undefined if it's called before mongo connection made 

now db object globally available module.