Drupal 9 Module Development Third Edition

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

▶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

▶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

▶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.

▶What this book covers
⦁ Chapter 1, Developing for Drupal 9, provides an introduction to module development in Drupal. In doing so, it introduces the reader to the various subsystems and outlines the requirements for running a Drupal 9 application.

⦁ Chapter 2, Creating Your First Module, gets the ball rolling with the creation of the first Drupal module of the book. Its primary focus is to explore the most common things module developers need to know from the get-go.

⦁ Chapter 3, Logging and Mailing, is about the tools available for doing something every web-based application does and/or should be doing; that is, sending emails and logging events.

⦁ Chapter 4, Theming, presents the theme system from a module developer's perspective in Drupal 9.

⦁ Chapter 5, Menus and Menu Links, explores the world of menus in Drupal and shows how to programmatically create and work with menu links.

⦁ Chapter 6, Data Modeling and Storage, looks at the various types of storage available in Drupal, from the State system to configuration and entities.

⦁ Chapter 7, Your Own Custom Entity and Plugin Types, takes a hands-on approach in terms of creating a custom configuration and content entity type, as well as a custom plugin type for wiring up a practical functional example.

⦁ Chapter 8, The Database API, presents the database abstraction layer and discusses how we can work directly with data stored in custom tables.

⦁ Chapter 9, Custom Fields, exemplifies the creation of the three plugins necessary for creating a custom field that can be used on a Drupal content entity type.

⦁ Chapter 10, Access Control, explores the world of access restrictions in Drupal, from roles and permissions to route and entity access checks.

⦁ Chapter 11, Caching, looks at the various cache mechanisms available for module developers to improve the performance of their functionality.

⦁ Chapter 12, JavaScript and the AJAX API, introduces module developers to the specificities of writing JavaScript in Drupal, as well as the powerful AJAX system, which can be used to build advanced interactions.

⦁ Chapter 13, Internationalization and Languages, deals with the practices that Drupal module developers need to observe in order to ensure that the application can be properly translated.

⦁ Chapter 14, Batches, Queues, and Cron, explores the various ways module developers can structure their data-processing tasks in a reliable way.

⦁ Chapter 15, Views, looks at the various ways module developers can programmatically interact with Views and even expose their own data to them.

⦁ Chapter 16, Working with Files and Images, explores the various file and image APIs that allow module developers to store, track, and manage files in Drupal.

⦁ Chapter 17, Automated Testing, explores the various types of automated tests that developers can write for their Drupal applications so as to ensure stable and resilient code.

⦁ Chapter 18, Drupal 9 Security, explores the most common security principles that need to be observed when developing Drupal 9 modules.