Drupal 7 Module Development

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Chapter 6 // Save the initial revision. $this->saveRevision($artwork, $user->uid); $op = 'insert'; } else { // Save the updated artwork. drupal_write_record('artwork', $artwork, 'aid'); if (!empty($artwork->revision)) { $this->saveRevision($artwork, $user->uid); } else { $this->saveRevision($artwork, $user->uid, TRUE); $update_artwork = FALSE; } } $op = 'update'; // If the revision ID is new or updated, save it to the artwork. if ($update_artwork) { db_update('artwork') ->fields(array('vid' => $artwork->vid)) ->condition('aid', $artwork->aid) ->execute(); } // Save fields. $function = 'field_attach_' . $op; $function('artwork', $artwork); module_invoke_all('entity_' . $op, $artwork, 'artwork'); // Clear internal properties. unset($artwork->is_new); // Ignore slave server temporarily to give time for the saved // order to be propagated to the slave. db_ignore_slave(); return $artwork; } [ 173 ]
Working with Content } catch (Exception $e) { $transaction->rollback(); watchdog_exception('artwork', $e, NULL, WATCHDOG_ERROR); return FALSE; } Most of the save routine is self-explanatory, and much of it is specific to the properties we've declared on our entity. A few parts bear further discussion, however. We're wrapping the entire process in a PHP try-catch block. That's because the save process could be arbitrarily complex, involving a number of queries, any of which could, potentially, break. We therefore start a database transaction with the db_transaction() function. Transactions allow multiple database queries to either all succeed or all fail together. Any queries that run, from anywhere, between the db_transaction() call and when the $transaction variable goes out of scope at the end of the function will be part of that transaction. If any queries, anywhere, fail, the database will throw an Exception. (There are other reasons an Exception could be thrown, too, but that is the most common.) In that case, we roll back the entire transaction with the rollback() method. Any queries that had already run get undone, and the entire save process effectively does not happen. That keeps us from ending up with a half-saved artwork, which requires manually editing the database to clean up. We also log the exception using a special utility function that decodes useful information from the exception for us. Note that transactions are not available if using MySQL's MyISAM database tables. In that case code will still function but any attempt to roll back a transaction will be ignored and the database will still be left in a potentially unstable state. For that reason, when running on MySQL Drupal defaults to InnoDB tables, which support transactions. Once we're done saving the artwork, we also call db_ignore_slave(). If we're running a high-traffic site then we may have both a master database and one or more slave databases configured, something Drupal supports natively. However, there may be a latency before our artwork gets propagated from the master server to the slave server. We therefore tell Drupal that, for the current user only, it should skip the slave server for a few minutes so that the user that submitted the artwork will see it immediately, even if there is a brief delay for other users. [ 174 ]
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www.allitebooks.com
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Drupal 7 Module Development Copyrig
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Foreword Drupal has its roots in th
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About the Authors Matt Butcher is a
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Larry Garfield is a Senior Architec
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John Albin Wilkins has been a web d
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Jojodae Ganesh Sivaji has been invo
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Why Subscribe? • Fully searchable
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Table of Contents Tools for develop
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Table of Contents A shortcut for sy
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Table of Contents Using hook_node_a
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Table of Contents Creating a task 3
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Preface Chapter 5, Building an Admi
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Preface The system for handling thi
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Developing for Drupal 7 Drupal is a
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However, what we do want to start w
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The Operating System Chapter 1 Wind
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Chapter 1 Drupal core is the founda
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Chapter 1 The database We have take
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Chapter 1 The responsibility of the
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Chapter 1 While one could imagine t
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Chapter 1 We assume that you have y
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Chapter 1 The following are a few o
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Creating Your First Module We are g
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Creating Your First Module As obvio
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Creating Your First Module By Drupa
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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 * - $user: The use
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Theming a Module Summary In this ch
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Building an Admin Interface Startin
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Page 149 and 150: Building an Admin Interface Each ar
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Page 174 and 175: Working with Content Drupal 7 intro
Page 176 and 177: Chapter 6 The Schema API allows dat
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Page 180 and 181: Chapter 6 'fieldable' => TRUE, 'ent
Page 182 and 183: Chapter 6 The return value from the
Page 184 and 185: Chapter 6 In our case, we defined t
Page 186 and 187: Chapter 6 Most entity operations in
Page 188 and 189: [ 165 ] Chapter 6 This callback sim
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Page 192 and 193: Chapter 6 This hook defines a new f
Page 194 and 195: Submit callback The submit callback
Page 198 and 199: Chapter 6 Master/slave database con
Page 200 and 201: Chapter 6 array($artwork->aid => $a
Page 202 and 203: Chapter 6 'access arguments' => arr
Page 204 and 205: Chapter 6 } foreach ($artworks as $
Page 206 and 207: Creating New Fields In the last cha
Page 208 and 209: Chapter 7 Although an advanced topi
Page 210 and 211: Chapter 7 The most important magic
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Page 214 and 215: Chapter 7 Exposing fields to the Fo
Page 216 and 217: Chapter 7 $element['width'] = array
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Page 220 and 221: Chapter 7 } return; 'field_ui_field
Page 222 and 223: Chapter 7 } function theme_dimfield
Page 224 and 225: Chapter 7 } '@height' => $item['hei
Page 226 and 227: Chapter 7 } else if ($settings['uni
Page 228 and 229: Chapter 7 We can, of course, have m
Page 230 and 231: Chapter 7 To demonstrate how entity
Page 232 and 233: [ 209 ] Chapter 7 Now look at that
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Page 236 and 237: Chapter 8 The preceding code checks
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Page 240 and 241: Chapter 8 The user_access() functio
Page 242 and 243: In the first case, Are we looking a
Page 244 and 245: 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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