Drupal 7 Module Development

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Credits Authors Matt Butcher Greg Dunlap Matt Farina Larry Garfield Ken Rickard John Albin Wilkins Editorial Team Leader Akshara Aware Project Team Leader Priya Mukherji Project Coordinator Srimoyee Ghoshal Reviewers Davy Van Den Bremt Dave Myburgh Jojodae Ganesh Sivaji Acquisition Editor Sarah Cullington Development Editors Mayuri Kokate Susmita Panda Technical Editors Vanjeet D'souza Harshit Shah Proofreader Aaron Nash Indexers Tejal Daruwale Hemangini Bari Graphics Nilesh R. Mohite Production Coordinator Aparna Bhagat Cover Work Aparna Bhagat Copy Editor Neha Shetty www.allitebooks.com
Foreword Drupal has its roots in the humble hobby project of Dries Buytaert, Drupal project lead, then a university student. He originally created a small news site and web board so that he and his friends could stay in touch. When it was time for graduation, this small script was put on the public web, and a small but vibrant community of developers, hackers, tinkerers, and innovators started to gather there. The script powering the website was open sourced as "Drupal" in January, 2001, and attracted attention due to its extensibility and modular architecture. Since then, both the Drupal project and its community have exploded in growth. The community now consists of over 700,000 people all over the world. Drupal also now powers over 1% of the web, including the websites of household names such as whitehouse.gov and grammy.com. My current position in the Drupal community is that of the Release Manager for the latest release of Drupal, version 7. Dries Buytaert and I work together with the core contributor team to help prioritize initiatives, encourage people attacking similar problems to work together, act as final quality assurance reviewers on patches, and ultimately commit changes to the project once they're ready. Drupal 7 represents a tremendous leap forward from previous releases. The core contributor team together took a very serious look at Drupal's limitations, from almost all angles. Usability testing research was done at several universities, highlighting long-standing problems with Drupal's user interface, and a usability team emerged to tackle the problems. Engineers collaborated together to identify and dissect severe API limitations that had plagued previous releases. The quality assurance team put tremendous efforts behind integrating automated testing into our development workflow, vastly improving our ability to refactor parts of the system. Drupal's designer community stepped up and became vocal about Drupal's limitations on the theming side that cause them to go flocking to other frameworks. An accessibility team emerged, not only pushing patches forward to improve Drupal's WCAG compliance, but also educating the members of the community about accessibility. Drupal 7 is a remarkable release for a number of reasons, but particularly for the diversity of the team involved in creating it. www.allitebooks.com
Page 1 and 2: www.allitebooks.com
Page 3: Drupal 7 Module Development Copyrig
Page 7 and 8: About the Authors Matt Butcher is a
Page 9 and 10: Larry Garfield is a Senior Architec
Page 11 and 12: John Albin Wilkins has been a web d
Page 13 and 14: Jojodae Ganesh Sivaji has been invo
Page 15 and 16: Why Subscribe? • Fully searchable
Page 17 and 18: Table of Contents Tools for develop
Page 19 and 20: Table of Contents A shortcut for sy
Page 21 and 22: Table of Contents Using hook_node_a
Page 23 and 24: Table of Contents Creating a task 3
Page 25 and 26: Preface Chapter 5, Building an Admi
Page 27 and 28: Preface The system for handling thi
Page 30 and 31: Developing for Drupal 7 Drupal is a
Page 32 and 33: However, what we do want to start w
Page 34 and 35: The Operating System Chapter 1 Wind
Page 36 and 37: Chapter 1 Drupal core is the founda
Page 38 and 39: Chapter 1 The database We have take
Page 40 and 41: Chapter 1 The responsibility of the
Page 42 and 43: Chapter 1 While one could imagine t
Page 44 and 45: Chapter 1 We assume that you have y
Page 46: Chapter 1 The following are a few o
Page 49 and 50: Creating Your First Module We are g
Page 51 and 52: Creating Your First Module As obvio
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Creating Your First Module The next
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Creating Your First Module When Dru
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Creating Your First Module Doxygen-
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Creating Your First Module The help
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Creating Your First Module Drupal s
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Creating Your First Module Finally,
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Creating Your First Module Here's o
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Creating Your First Module ); } } r
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Creating Your First Module Not in J
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Creating Your First Module There ar
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Creating Your First Module The exam
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Creating Your First Module Setting
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Creating Your First Module } ); pub
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Creating Your First Module You migh
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Creating Your First Module The repo
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Drupal’s Theme Layer This book is
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Drupal’s Theme Layer There are ac
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Drupal’s Theme Layer Theme engine
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Drupal’s Theme Layer Preprocess f
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Drupal’s Theme Layer A Drupal the
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Drupal’s Theme Layer The theme()
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Drupal’s Theme Layer Now, if you
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Drupal’s Theme Layer A similar pr
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Drupal’s Theme Layer Now, that wa
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Drupal’s Theme Layer • #suffix:
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Drupal’s Theme Layer Two powerful
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Drupal’s Theme Layer 'menu_tree__
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Drupal’s Theme Layer If a functio
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Drupal’s Theme Layer We've also s
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Drupal’s Theme Layer Summary You'
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Theming a Module After all, if you
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Theming a Module * Enables a single
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Theming a Module * First draft! * *
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Theming a Module Theming a Drupal b
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Theming a Module Converting a theme
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Theming a Module if (is_array($elem
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Theming a Module Notice that the .b
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Theming a Module } $block['content'
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Theming a Module } 'variables' => a
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Theming a Module } // Theme the use
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Theming a Module // Create links fo
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Theming a Module } // Load the acco
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Theming a Module * - $user: The use
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Theming a Module Summary In this ch
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Building an Admin Interface Startin
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Building an Admin Interface $items[
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Building an Admin Interface 'access
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Building an Admin Interface Each ar
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Building an Admin Interface Other p
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Building an Admin Interface Each el
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Building an Admin Interface Drupal
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Building an Admin Interface This is
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Building an Admin Interface Form su
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Building an Admin Interface A short
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Building an Admin Interface } retur
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Building an Admin Interface PHP mai
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Building an Admin Interface Impleme
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Building an Admin Interface Debuggi
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Building an Admin Interface This te
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Working with Content Drupal 7 intro
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Chapter 6 The Schema API allows dat
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'fields' => array( 'aid' => array(
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Chapter 6 'fieldable' => TRUE, 'ent
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Chapter 6 The return value from the
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Chapter 6 In our case, we defined t
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Chapter 6 Most entity operations in
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[ 165 ] Chapter 6 This callback sim
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Chapter 6 This page will simply gen
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Chapter 6 This hook defines a new f
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Submit callback The submit callback
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Chapter 6 // Save the initial revis
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Chapter 6 Master/slave database con
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Chapter 6 array($artwork->aid => $a
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Chapter 6 'access arguments' => arr
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Chapter 6 } foreach ($artworks as $
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Creating New Fields In the last cha
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Chapter 7 Although an advanced topi
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Chapter 7 The most important magic
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Chapter 7 } } '#type' => 'select',
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Chapter 7 Exposing fields to the Fo
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Chapter 7 $element['width'] = array
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Chapter 7 if ($widget['type'] == 'd
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Chapter 7 } return; 'field_ui_field
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Chapter 7 } function theme_dimfield
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Chapter 7 } '@height' => $item['hei
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Chapter 7 } else if ($settings['uni
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Chapter 7 We can, of course, have m
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Chapter 7 To demonstrate how entity
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[ 209 ] Chapter 7 Now look at that
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Drupal Permissions and Security Per
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Chapter 8 The preceding code checks
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Chapter 8 If we had accidentally ru
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Chapter 8 The user_access() functio
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In the first case, Are we looking a
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Chapter 8 Declaring your own access
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} Chapter 8 'page callback' => 'exa
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Chapter 8 if (!flood_is_allowed('co
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[ 227 ] Chapter 8 Enabling permissi
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Chapter 8 } $permissions = array( '
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Chapter 8 This approach is the prop
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Chapter 8 Running access checks on
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Chapter 8 Handling AJAX callbacks s
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Chapter 8 As a result, we cannot tr
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Chapter 8 This allows us to pass a
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Node Access Out-of-the-box, Drupal
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Chapter 9 The Node Access API allow
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* - "delete" * - "create" * @param
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Chapter 9 if (!user_access('access
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Chapter 9 } if (module_implements('
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Chapter 9 hook_node_access() is the
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Chapter 9 Note that the {node_acces
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Chapter 9 The basic permission 'cre
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Chapter 9 It is a good idea to writ
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Chapter 9 On node listing pages, th
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Chapter 9 Writing a complete node a
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• Can this user bypass node acces
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Chapter 9 For our test module, we w
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Chapter 9 When hook_node_access_rec
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Chapter 9 A few things to consider
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Chapter 9 Security considerations T
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Chapter 9 Rebuilding the {node_acce
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Chapter 9 Using the new hook_node_a
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Chapter 9 We may alter any element
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Chapter 9 } // Check anonymous user
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Chapter 9 // Check the permission.
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Chapter 9 The key to Devel Node Acc
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Chapter 9 In the preceding case, th
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JavaScript in Drupal JavaScript is
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Chapter 10 Adding JavaScript and CS
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Chapter 10 When a JavaScript librar
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The following code adds a system CS
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Chapter 10 The second argument can
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Chapter 10 From here onwards, when
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Chapter 10 If a renderable array is
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Chapter 10 Drupal specific JavaScri
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Chapter 10 There are three ways var
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Chapter 10 AJAX helpers Included in
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The callback function hello_world_s
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Chapter 10 Once the response is set
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ajax_command_prepend To add content
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Working with Files and Images Drupa
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Chapter 11 It is very important tha
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Chapter 11 In order to open files f
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Chapter 11 Stream wrappers If you'v
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Chapter 11 In some cases you may no
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Chapter 11 A read-only stream wrapp
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Chapter 11 } 'type' => STREAM_WRAPP
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Chapter 11 For full details of thes
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Chapter 11 After this setup, we sta
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Chapter 11 This is all very cool, b
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Chapter 11 This is where you can st
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Chapter 11 • form callback: If yo
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Chapter 11 Finally we can make the
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Chapter 11 Pretty cool right? Howev
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Chapter 11 As you can see, there is
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Installation Profiles This chapter
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Chapter 12 Profile modules and them
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Enabling modules Just like modules
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Chapter 12 • display_name: A huma
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Next, let's create a form to enter
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Chapter 12 Notice that $install_sta
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Chapter 12 Here, the task that sets
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Chapter 12 Each row being added to
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Chapter 12 // URL filter. 'filter_u
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Chapter 12 'locale' => 'en', ), //
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Database Access Although Drupal 7 h
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Appendix A Result objects The retur
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Appendix A The join() methods all r
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[ 369 ] Appendix A The db_insert()
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Appendix A A Merge query says, in e
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Appendix A Slave servers Drupal als
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Security Throughout this book, we h
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Filtering The following guidelines
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First, whenever we write a query ag
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Appendix B There are both RSS feeds
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ajax_command_alert command 309 ajax
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Drupal, subsytems blocks 20 code te
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form handling 229 forms access chec
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K key() method 371 L label property
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evision handling 175 revisions hand
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U unit test 49 update queries 370 u
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Drupal 7 ISBN: 978-1-84951-286-2 Pa
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