Drupal 9 Module Development: Get up and running with building powerful Drupal modules and applications, 3rd Edition

Build and extend flexible Drupal sites and applications with this up-to-date, expert guide to Drupal 9 module development

Key Features

• Explore the essential Drupal 9 APIs for module development
• Learn how to implement data modeling, caching, architecture, and much more in your Drupal applications
• Discover what's new in the latest Drupal core releases

Book Description

With its latest release, Drupal 9, the popular open source CMS platform has been updated with new functionalities for building complex Drupal apps with ease. This third edition of the Drupal Module Development guide covers these new Drupal features, helping you to stay on top of code deprecations and the changing architecture with every release.

The book starts by introducing you to the Drupal 9 architecture and its subsystems before showing you how to create your first module with basic functionality. You'll explore the Drupal logging and mailing systems, learn how to output data using the theme layer, and work with menus and links programmatically. Once you've understood the different kinds of data storage, this Drupal guide will demonstrate how to create custom entities and field types and leverage the Database API for lower-level database queries. You'll also learn how to introduce JavaScript into your module, work with various file systems, and ensure that your code works on multilingual sites. Finally, you'll work with Views, create automated tests for your functionality, and write secure code.

By the end of the book, you'll have learned how to develop custom modules that can provide solutions to complex business problems, and who knows, maybe you'll even contribute to the Drupal community!

What you will learn

• Develop custom Drupal 9 modules for your applications
• Master different Drupal 9 subsystems and APIs
• Model, store, manipulate, and process data for effective data management
• Display data and content in a clean and secure way using the theme system
• Test your business logic to prevent regression
• Stay ahead of the curve and write PHP code by implementing best practices

Who this book is for

If you are a Drupal developer looking to learn Drupal 9 to write modules for your sites, this book is for you. Drupal site builders and PHP developers with basic object-oriented programming skills will also find this book helpful. Although not necessary, some Symfony experience will help with understanding concepts easily.

Table of Contents

1. Developing for Drupal 9
2. Creating Your First Module
3. Logging and Mailing
4. Theming
5. Menus and Menu Links
6. Data Modeling and Storage
7. Your Own Custom Entity and Plugin Types
8. The Database API
9. Custom Fields
10. Access Control
11. Caching
12. JavaScript and the Ajax API
13. Internationalization and Languages
14. Batches, Queues, and Cron
15. Views
16. Working with Files and Images
17. Automated Testing
18. Drupal 9 Security

Daniel Sipos is a senior web developer specializing in Drupal. He's been working with Drupal sites since version 6, and started out, like many others, as a site builder. He's a self-taught programmer with many years' experience working professionally on complex Drupal 7 and 8 projects. In his spare time, he runs webomelette, a Drupal website where he writes technical articles, tips, and techniques related to Drupal development.