Book Image

Supercharging Node.js Applications with Sequelize

By : Daniel Durante
4 (1)
Book Image

Supercharging Node.js Applications with Sequelize

4 (1)
By: Daniel Durante

Overview of this book

Continuous changes in business requirements can make it difficult for programmers to organize business logic into database models, which turns out to be an expensive operation as changes to the database may result in errors and incongruity within applications. Supercharging Node.js Applications with Sequelize helps you get to grips with Sequelize, a reliable ORM that enables you to alleviate these issues in your database and applications. With Sequelize, you'll no longer need to store information in flat files or memory. This book takes a hands-on approach to implementation and associated methodologies for your database that will have you up and running in no time. You'll learn how to configure Sequelize for your Node.js application properly, develop a better sense of understanding of how this ORM works, and find out how to manage your database from Node.js using Sequelize. Finally, you'll be able to use Sequelize as the database driver for building your application from scratch. By the end of this Node.js book, you'll be able to configure, build, store, retrieve, validate, and associate your data from a database to a Node.js application.
Table of Contents (16 chapters)
1
Part 1 – Installation, Configuration, and the Basics
4
Part 2 – Validating, Customizing, and Associating Your Data
10
Part 3 – Advanced Queries, Using Adapters, and Logging Queries

Adding Hooks and Lifecycle Events to Your Models

ORM typically provides a way for us to be able to transform states, or objects, throughout events that occur when executing certain operations. These methods are often referred to as hooks, lifecycle events, object lifecycles, or even callbacks (the latter is not often used within the Node.js community due to a nomenclature conflict against Node.js’ native environment). Usually, these methods have a temporal prefix (for example, before and after) preceding an event’s name.

There are no strict rules as to what an ORM requires as an event throughout its entire lifecycle. The events typically included within an ORM are called: validation, save, create, update, and destroy. Other ORM frameworks offer a wider scope of events or more granular control, such as before/after connecting to your database, defining your models, and calling a finder query.

Sequelize categorizes hooks into global and local hooks. Global hooks...