Mongoose auto-increment

Question

I would like to create auto increment ID with Mongoose for MongoDB. I was already looking for some examples, but there aren't anything useful other the MongoDB's documentation.

Answer 1

Use mongoose-sequence, For eg: In the below model, it increments order number by one when a new document is inserted.

const mongoose = require('mongoose'),
Schema = mongoose.Schema;

const AutoIncrement = require('mongoose-sequence')(mongoose);

const orderSchema = new Schema({
   _id: mongoose.Schema.Types.ObjectId,
   orderId: {
     type: Number
   }
   ...
});

orderSchema.plugin(AutoIncrement, {inc_field: 'orderId'});
module.exports = mongoose.model('Order', orderSchema);

There is an important thing that needs to be understood. If you add required: true in the schema, the operation breaks.

In your route file, you can create a mongoose order object and call save.

...
const order = new Order(body);
order.save()
     .then(doc => {
       res.json(doc);
       res.end();
     });

Answer 2

On npm we have mongoose-auto-increment and mongoose-sequence packages to achieve this functionality very easily.