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

Using advanced association options

Sequelize offers a variety of tricks to help communicate with your database’s relations properly. Some of these methods will help query associations in a more organized and ergonomic way. Other methods will offer us a way to compose the database’s schematics for more advanced relationship patterns. In this section, we will be going over examples of how to manage complex many-to-many relationships using the Super Many-to-Many pattern, define scoped associations, and query polymorphic associations.

Using scopes with associations

Scopes are a way to define a namespace with a default set of parameters, or parameters that override previously applied scopes to a query. Associations may have defined scopes to help with organization of the code base. A key difference between scopes for associations and models is that the association scope’s parameters are applicable for the WHERE clause. Model scopes can define the WHERE, LIMIT...