Drupal 7 Module Development

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Greg Dunlap is a software engineer based in Stockholm, Sweden. Over the past 15 years, Greg has been involved in a wide variety of projects, including desktop database applications, kiosks, embedded software for pinball and slot machines, and websites in over a dozen programming languages. Greg has been heavily involved with Drupal for three years, and is the maintainer of the Deploy and Services modules as well as a frequent speaker at Drupal conferences. Greg is currently a Principal Software Developer at NodeOne. Several people played crucial roles in my development as a Drupal contributor, providing support and encouragement just when I needed it most. My deepest gratitude to Gary Love, Jeff Eaton, Boris Mann, Angie Byron, and Ken Rickard for helping me kick it up a notch. Extra special thanks to the lovely Roya Naini for putting up with lost nights and weekends in the service of finishing my chapters. Matt Farina has been a Drupal developer since 2005. He is a senior front-end developer, engineer, and technical lead for Palantir.net, where he works on a wide variety of projects ranging from museums to large interactive sites. He is a contributor to Drupal core as well as a maintainer of multiple contributed Drupal modules. Matt wrote his first computer program when he was in the 5th grade. Since then he has programmed in over a dozen languages. He holds a BS in Electrical Engineering from Michigan State University. www.allitebooks.com
Larry Garfield is a Senior Architect and Engineer at Palantir.net, a leading Drupal development firm based in Chicago. He has been building websites since he was 16, which is longer than he'd like to admit, and has been working in PHP since 1999. He found Drupal in 2005, when Drupal 4.6 was still new and cool, and never really left. He is the principle architect and maintainer of the Drupal database subsystem among various other core initiatives and contributed modules. Previously, Larry was a Palm OS developer and a journalist covering the mobile electronics sector and was the technical editor for Building Powerful and Robust Websites with Drupal 6, also from Packt. He holds a Bachelors and Masters Degree in Computer Science from DePaul University. If I were to thank all of the people who made this book possible it would take several pages, as the Drupal 7 contributor list was well over 700 people, the last time I checked. Instead I will simply say thank you to the entire community for being so vibrant, supportive, and all-around amazing that it still brings a tear to my eye at times even after half a decade. Extra special thanks go to Dries Buytaert, not just for being our project lead, but for sitting down on the floor next to me at DrupalCon Sunnyvale and encouraging me to run with this crazy idea I had, about using this "PDO" thing for Drupal's database layer. I doubt he realized how much trouble I'd cause him over the next several years. Of course to my parents, who instilled in me not only a love of learning but a level of pedantry and stubbornness without which I would never have been able to get this far in Drupal, to say nothing of this book. www.allitebooks.com
Page 1 and 2: www.allitebooks.com
Page 3 and 4: Drupal 7 Module Development Copyrig
Page 5 and 6: Foreword Drupal has its roots in th
Page 7: About the Authors Matt Butcher is a
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
Page 53 and 54: Creating Your First Module By Drupa
Page 55 and 56: Creating Your First Module The next
Page 57 and 58: 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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