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Drupal 8 Module Development - Second Edition

By : Sipos

4.3 (8)

Drupal 8 Module Development

4.3 (8)

By: Sipos

Overview of this book

Drupal 8 comes with a release cycle that allows for new functionality to be added at a much faster pace. However, this also means code deprecations and changing architecture that you need to stay on top of. This book updates the first edition and includes the new functionality introduced in versions up to, and including 8.7. The book will first introduce you to the Drupal 8 architecture and its subsystems before diving into creating your first module with basic functionality. You will work with the Drupal logging and mailing systems, learn how to output data using the theme layer and work with menus and links programmatically. Then, you will learn how to work with different kinds of data storages, create custom entities, field types and leverage the Database API for lower level database queries. You will further see how to introduce JavaScript into your module, work with the various file systems and ensure the code you write works on multilingual sites. Finally, you will learn how to programmatically work with Views, write automated tests for your functionality and also write secure code in general. By the end, you will have learned how to develop your own custom module that can provide complex business solutions. And who knows, maybe you’ll even contribute it back to the Drupal community. Foreword by Dries Buytaert, founder of Drupal.

Preface

Preface

Who this book is for

What this book covers

To get the most out of this book

Get in touch

Free Chapter

Developing for Drupal 8

Developing for Drupal 8

Introducing Drupal (for developers)

Developing for Drupal 8

Technologies that drive Drupal

Summary

Creating Your First Module

Creating Your First Module

Creating a module

Using services in Drupal 8

The form

Blocks

Working with links

Event Dispatcher and redirects

Summary

Logging and Mailing

Logging and Mailing

Logging

Mail API

Tokens

Summary

Theming

Theming

Business logic versus presentation logic

Twig

Theme hooks

Theme hook suggestions

Render arrays

Assets and libraries

Common theme hooks

Attributes

Layouts

Theming our Hello World module

Summary

Menus and Menu Links

Menus and Menu Links

The menu system

Rendering menus

Working with menu links

Defining local tasks

Defining local actions

Defining contextual links

Summary

Data Modeling and Storage

Data Modeling and Storage

Different types of data storage

State API

TempStore

UserData

Configuration

Entities

TypedData

Interacting with the Entity API

Summary

Your Own Custom Entity and Plugin Types

Your Own Custom Entity and Plugin Types

Custom content entity type

Drush command

Summary

The Database API

The Database API

The Schema API

Running queries

Summary

Custom Fields

Custom Fields

A recap of Field type plugins

Field type

Field widget

Field formatter

Field settings

Using our custom field type as a base field

Summary

Access Control

Access Control

Introduction to the Drupal access system

Defining permissions

Checking the user credentials

Route access

Entity access

Block access

Summary

Caching

Caching

Introduction to Caching

Cacheability metadata

Placeholders and lazy building

Using the Cache API

Summary

JavaScript and the Ajax API

JavaScript and the Ajax API

JavaScript in Drupal

The Ajax API

Summary

Internationalization and Languages

Internationalization and Languages

Introduction to the multilingual ecosystem

Internationalization

Content entities and the Translation API

Summary

Batches, Queues, and Cron

Batches, Queues, and Cron

Batch-powered update hooks

Batch operations

Cron

Queues

The Lock API

Summary

Views

Views

Entities in Views

Exposing custom data to Views

Custom Views field

Custom Views filter

Custom Views argument

Views theming

Views hooks

Summary

Working with Files and Images

Working with Files and Images

The filesystem

Stream wrappers

Managed versus unmanaged files

Using the File and Image fields

Working with managed files

Our own stream wrapper

Working with unmanaged files

Private filesystem

Images

Summary

Automated Testing

Automated Testing

Testing methodologies in Drupal 8

PHPUnit

Registering tests

Unit tests

Kernel tests

Functional tests

Functional JavaScript tests

Summary

Drupal 8 Security

Drupal 8 Security

Cross-Site Scripting (XSS)

SQL Injection

Cross-Site Request Forgery (CSRF)

Summary

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Functional tests

In the previous section we looked at Kernel tests and said that they are basically integration tests that focus on components rather than interactions with the browser. In this section, we'll go one level up and talk about the fully-fledged Functional tests, otherwise called browser tests (from the name of the base class we need to extend).

Functional tests in Drupal 8 use a simulated browser (using the popular Mink emulator) that allows users to click links, navigate to pages, work with forms and make assertions regarding HTML elements on the page. What they don't allow us is to test JavaScript-based interactions (see the next section for those).

In Drupal 7, Functional tests were the most common type of tests used, most classes extending from Simpletest's WebTestBase class. But in Drupal 8 we have the Drupal\Tests\BrowserTestBase class which is...

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Tech Concepts

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Programming languages

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