MongoDB Mongoose state persistence

Question

When you do this in a main.js module:

var db = require('mongoose');
db.connect('mongodb://localhost/piautomation');
var myOwnModule = require('./myOwnModule');

And myOwnModule.js :

var db = require('mongoose');

Is db using a persisted mongoose connection or do you have to wrap the mongoose module in your own module to persist the connection?

Below is the wrapped version.

main.js code:

var dbConnect = require('./dbConnect'),
    myOwnModule = require('./myOwnModule');

dbConnect.js code:

var db = require('mongoose');
module.exports = db.connect('mongodb://localhost/piautomation');

myOwnModule.js code:

var persistedDb = require('./dbConnect');

Answer 1

No, you don't need to do that.

On application start up, you can do the following:

var db = require('mongoose');
db.connect('mongodb://localhost/piautomation');

Connections are pooled internally by mongoose

From the Mongoose Docs

Each connection, whether created with mongoose.connect or mongoose.createConnection are all backed by an internal configurable connection pool defaulting to a size of 5.