CODEWITHSUNDEEP
node.jsmongodbmongoose
ColdMonkey
ColdMonkey

Reputation: 57

Difference between require('mongoose').Mongoose and require('mongoose')

I've noticed that certain libraries like
Mockgoose (https://github.com/mccormicka/Mockgoose/blob/master/test/index.spec.js)
use require('mongoose').Mongoose to declare an instance of mongoose like this:

var Mongoose = require('mongoose').Mongoose;
var mongoose = new Mongoose();
var db = mongoose.connect('mongodb://localhost:27017/TestingDB');

However, most examples I've seen online does this to connect to a database:

var mongoose = require('mongoose');
var db = mongoose.connect('mongodb://localhost:27017/TestingDB');

I just want to know if there's a difference between these two methods of getting an instance of mongoose or are they really two different ways to get the same thing.

Thanks

Upvotes: 3

Views: 555

Answers (1)

Kevin B
Kevin B

Reputation: 95048

There is a difference between the two.

require('mongoose') returns an instance of Mongoose, and new require('mongoose').Mongoose gives you a new instance of Mongoose that isn't the same instance as the one returned from require('mongoose'). The latter is useful when a particular part of your app needs it's own instance of mongoose that doesn't conflict with the rest (which makes it perfect for unit testing)

In a typical application though you'll want to simply use require('mongoose') so that everywhere you use require('mongoose'), you'll get the same instance.

https://github.com/Automattic/mongoose/blob/master/lib/index.js#L520

Upvotes: 4

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