A common thing you'll have to do as a module developer is to intercept a given request and redirect it to another page, and more often than not, this will have to be dynamic, depending on the current user or other contextual info. Drupal 7 developers know very well that this has always been an easy task. Simply implement hook_init(), which gets called on each request and then use the famous drupal_goto() function. This, however, is no longer the case in Drupal 8. What we have to do now is subscribe to the kernel.request event (remember this from the preceding chapter?) and then change the response directly. However, before seeing an example of this, let's take a look at how we can perform a simpler redirect from within a Controller.
Drupal 8 Module Development
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Drupal 8 Module Development
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Overview of this book
Drupal is an open source web-based content management system (CMS) that can be used for building anything from simple websites to complex applications. It enables individuals and organizations to build platforms that engage users and deliver the right content at the right time.
Drupal 8 is an exciting new development in the Drupal community. However, the differences from the previous version are substantial and this can put quite some pressure on Drupal 7 developers that need to catch up. This book aims to help such developers in getting up to speed with Drupal 8 module development.
The book first introduces you to the Drupal 8 architecture and its subsystems before diving into creating your first module with basic functionality. Building upon that, you will cover many core APIs and functionalities available to module developers.
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. Moreover, you will learn about the Drupal 8 access system and caching layer as well as the APIs used for data processing (queues and batches).
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 of the book, you will have learned how to develop your own custom module from scratch that can help solve a small problem or even provide complex functionality. And who knows, maybe you’ll even contribute it back to the Drupal community.
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Current Title:
Drupal 8 Module Development
Table of Contents (19 chapters)
Preface
Free Chapter
Developing for Drupal 8
Creating Your First Module
Logging and Mailing
Theming
Menus and Menu Links
Data Modeling and Storage
Your Own Custom Entity and Plugin Types
The Database API
Custom Fields
Access Control
Caching
JavaScript and the Ajax API
Internationalization and Languages
Batches, Queues, and Cron
Views
Working with Files and Images
Automated Testing
Customer Reviews