mongoose-auto-increment

This plugin allows you to auto-increment any field on any mongoose schema that you wish.

Getting Started

npm install mongoose-auto-increment

Once you have the plugin installed it is very simple to use. Just get reference to it and call the plugin() function on your schema.

var mongoose = require('mongoose'),
    autoIncrement = require('mongoose-auto-increment');

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

bookSchema.plugin(autoIncrement, 'Book');
mongoose.model('Book', bookSchema);

That's it. Now you can create book entities at will and the _id field will automatically increment with each new document.

Want a field other than _id?

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

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

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

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

Want your field to increment every time you update it too?

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