@safer-bwd/mongoose-autonumber

A Mongoose plugin that adds support for auto-increment or auto-number fields to a Mongoose schema. The plugin supports numbering inside groups and periods.

Install

npm install @safer-bwd/mongoose-autonumber --save

Options

counterName string The Mongoose model name for storing counters (optional, default __Counter)

Settings

The plugin adds an option autonumber for String or Number schema types.

autonumber (boolean | Object) (optional, default false)
- autonumber.numerator string The counter name (optional)
- autonumber.group (string | Function) The path to a Mongoose document grouping property or function to calculate the group (optional)
- autonumber.period string The periodicity of numbering. Used only with autonumber.date (optional, available values year, month, day, hour, minute)
- autonumber.date (string | Function) The path to a Mongoose document date property or function to calculate the date. Used only with autonumber.period (optional)
- autonumber.prefix (string | Function) The path to a Mongoose document prefix property or function to calculate the prefix. Used only with String schema type (optional)
- autonumber.addLeadingZeros boolean The flag, If true then leading zeros are added. Used only with String schema type and maxlength schema type option (optional)

Usage

The number is set automatically when a new document is saved.

Important: By default, the plugin does not make auto number fields immutable. But you can use schema type option immutable.

Auto increment

import autoNumberPlugin from '@safer-bwd/mongoose-autonumber';
  
const schema = new mongoose.Schema({
  number: {
    type: Number,
    immutable: true,
    autonumber: true,
  }
});
schema.plugin(autoNumberPlugin);
const Order = mongoose.model('Order', schema);

const order1 = new Order();
await order1.save(); // number => 1
const order2 = new Order();
await order2.save(); // number => 2

Increment inside group

import autoNumberPlugin from '@safer-bwd/mongoose-autonumber';
  
const schema = new mongoose.Schema({
  customer: String,
  immutable: true,
  number: {
    type: Number,
    autonumber: {
      group: doc => doc.customer 
    }
  }
});
schema.plugin(autoNumberPlugin);
const Order = mongoose.model('Order', schema);

const order1 = new Order({ customer: 'A' });
await order1.save(); // number => 1
const order2 = new Order({ customer: 'A' });
await order2.save(); // number => 2
const order3 = new Order({ customer: 'B' });
await order3.save(); // number => 1

Increment inside period

import autoNumberPlugin from '@safer-bwd/mongoose-autonumber';
  
const schema = new mongoose.Schema({
  period: Date,
  number: {
    type: Number,
    immutable: true,
    autonumber: {
        period: 'year',
        date: doc => doc.period
    }
  }
});
schema.plugin(autoNumberPlugin);
const Order = mongoose.model('Order', schema);

const order1 = new Order({ period: new Date(2019, 0, 1) });
await order1.save(); // number => 1
const order2 = new Order({ period: new Date(2019, 0, 2) });
await order2.save(); // number => 2
const order3 = new Order({ period: new Date(2020, 0, 1) });
await order3.save(); // number => 1

Prefix and adding leading zeros

In this case maxlength = the total number length (prefix + suffix). If the schema type option maxlength is not set then leading zeros will not be added.

import autoNumberPlugin from '@safer-bwd/mongoose-autonumber';
  
const schema = new mongoose.Schema({
  customer: String,
  number: {
    type: String,
    immutable: true,
    maxlength: 6,
    autonumber: {
      prefix: doc => `${doc.customer}-`,
      addLeadingZeros: true
    }
  }
});
schema.plugin(autoNumberPlugin);
const Order = mongoose.model('Order', schema);

const order1 = new Order({ customer: 'A' });
await order1.save(); // number => 'A-0001'
const order2 = new Order({ customer: 'A' });
await order2.save(); // number => 'A-0002'
const order3 = new Order({ customer: 'B' });
await order3.save(); // number => 'B-0003'