How to create a collection automatically in mongoDB if it's not already there?

Question

I am creating passport authentication for node using mongoose. I don't have any collection called "users" in my database. But while creating new user using the schema like below

var mongoose = require('mongoose');

 module.exports = mongoose.model('User',{
id: String,
username: String,
password: String,
email: String,
firstName: String,
lastName: String
});

It will automatically creates new "users" collection. How is this possible?

Answer 1

Here mongoose will check if there is a collection called "Users" exists in MongoDB if it does not exist then it creates it. The reason being, mongoose appends 's' to the model name specified. In this case 'User' and ends up creating a new collection called 'Users'. If you had specified the model name as 'Person', then it will end up creating a collection called 'Persons' if a collection with the same name does not exist.