Node.js & Express.js Series | Chapter 15 | Updating records in database(Adding a new property/field)

When working with databases in Node.js and Express.js, it’s common to have the need to update records by adding new properties or fields. In this chapter, we’ll cover how to do this using Node.js and Express.js.

Using Mongoose to update records

Mongoose is a popular MongoDB object modeling tool designed to work in an asynchronous environment. It provides a straight-forward, schema-based solution to model your application data and includes built-in type casting, validation, query building, and business logic hooks.

To add a new property or field to an existing record in the database using Mongoose, you can use the findOneAndUpdate method. This method allows you to find a record based on a query and then update it with the new property/field.

Here’s an example of how you can do this in your Node.js and Express.js application:

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

	// Define a schema for your data
	const mySchema = new Schema({
	  name: String,
	  age: Number
	});

	// Create a model for your schema
	const MyModel = mongoose.model('MyModel', mySchema);

	// Find and update a record
	MyModel.findOneAndUpdate({ name: 'John' }, { $set: { email: 'john@example.com' } }, { new: true }, function(err, doc) {
	  if (err) {
	    console.log("Something wrong when updating data!");
	  }

	  console.log(doc);
	});
	

In this example, we’re finding a record with the name ‘John’ and updating it by adding a new property ’email’ with the value ‘john@example.com’. The new: true option is used to return the updated document rather than the original one.

Conclusion

Updating records in a database by adding new properties or fields is a common task when working with Node.js and Express.js. Using Mongoose, you can easily achieve this by using the findOneAndUpdate method. This allows you to find a record based on a query and update it with the new property/field. Remember to handle errors and check for successful updates when working with database operations in Node.js and Express.js.