mongoose-auto-increment

Mongoose plugin that auto-increments any ID field on your schema every time a document is saved.

Getting Started

npm install @alec016/mongoose-autoincrement

Once you have the plugin installed it is very simple to use. Just get reference to it, initialize it by passing in your mongoose connection and pass autoIncrement.plugin to the plugin() function on your schema.

Note: You only need to initialize MAI once.

Note: This plugin is not compatible with nextjs ( app folder [ experimental functionality ] )

Note: This plugin is compatible with no experimental folder of nextjs

Note: This plugin is not compatible with any no static serverside framework

Connection and Initialization

const mongoose = require('mongoose'),
    Schema = mongoose.Schema,
    autoIncrement = require('@alec016/mongoose-autoincrement');

mongoose.connect("mongodb://localhost/myDatabase");
const connection = mongoose.connection

autoIncrement.initialize(connection);

const bookSchema = new Schema({
    author: { type: Schema.Types.ObjectId, ref: 'Author' },
    title: String,
    genre: String,
    publishDate: Date
});

bookSchema.plugin(autoIncrement.plugin, 'Book');
const Book = connection.model('Book', bookSchema);

That's it. Now you can create book entities at will and they will have an id field added of type Number and will automatically increment with each new document. Even declaring references is easy, just remember to change the reference property's type to Number instead of ObjectId if the referenced model is also using the plugin.

const authorSchema = new mongoose.Schema({
    name: String
});

const bookSchema = new Schema({
    author: { type: Number, ref: 'Author' },
    title: String,
    genre: String,
    publishDate: Date
});

bookSchema.plugin(autoIncrement.plugin, 'Book');
authorSchema.plugin(autoIncrement.plugin, 'Author');

Want a field other than id?

bookSchema.plugin(autoIncrement.plugin, { model: 'Book', field: 'bookId' });

Want that field to start at a different number than zero or increment by more than one?

bookSchema.plugin(autoIncrement.plugin, {
    model: 'Book',
    field: 'bookId',
    startAt: 100,
    incrementBy: 100
});

Your first book document would have a bookId equal to 100. Your second book document would have a bookId equal to 200, and so on.

Want to know the next number coming up?

const Book = connection.model('Book', bookSchema);
Book.nextCount(function(err, count) {

    // count === 0 -> true

    const book = new Book();
    book.save(function(err) {

        // book._id === 0 -> true

        book.nextCount(function(err, count) {

            // count === 1 -> true

        });
    });
});

nextCount is both a static method on the model (Book.nextCount(...)) and an instance method on the document (book.nextCount(...)).

Want to reset counter back to the start value?

bookSchema.plugin(autoIncrement.plugin, {
    model: 'Book',
    field: 'bookId',
    startAt: 100
});

const Book = connection.model('Book', bookSchema),
    book = new Book();

book.save(function (err) {

    // book._id === 100 -> true

    book.nextCount(function(err, count) {

        // count === 101 -> true

        book.resetCount(function(err, nextCount) {

            // nextCount === 100 -> true

        });

    });

});