Retrieving a Single Numeric Device ID from a Mongoose Schema

Question

How can I retrieve the deviceId as a single numeric value in my Mongoose schema and Express.js controller?

I'm using Mongoose with Express.js to save car records, and I've defined a deviceId field as a SchemaTypes.Long to accommodate large numbers. After saving a record, the response includes the deviceId as an object with low, high, and unsigned properties. However, I need to retrieve this value as a single, numeric value.

const mongoose = require("mongoose");
require('mongoose-long')(mongoose);
var SchemaTypes = mongoose.Schema.Types;

const carSchema = new mongoose.Schema({
  name: { type: String, required: true },
  deviceId: { type: SchemaTypes.Long, required: true, unique: true }
}, { versionKey: false, virtuals: true });

module.exports = mongoose.model("car", carSchema);

exports.carDemo = catchAsync(async (req, res, next) => {
  const car = await Car.create(req.body);
  res.status(statusCode.OK).json(
    car
  );
});

I expect the response to include the deviceId as a single numeric value, similar to how it was provided in the request body.

API Response response body

Expected

{
    "name": "I20",
    "deviceId":997786565423234,
    "_id":"66cf265cdcd77799f701efef"
}

Yuvaraj M · Accepted Answer · 2024-08-29 05:54:46Z

0

Why because it will be initially in BSON object, You need to use toNumber method to get that representation.

res.status(statusCode.OK).json(
   ...car,
   deviceId : car.deviceId.toNumber()
);

answered Aug 29, 2024 at 5:54

Yuvaraj M

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