Drupal 7 Module Development

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Chapter 6 The Schema API allows database-agnostic definition and manipulation of the tables in Drupal's SQL database. First, let's create a new module called "artwork". Start with the artwork.info and artwork.module files, as we've seen in previous chapters. However, we will also add another file, artwork.install. This file contains hooks that Drupal only ever uses when the module is being installed, removed, or updated so it only gets loaded at those times, saving considerable code on most page loads. The most important hook in the artwork.install file is hook_schema(), which defines the database tables this module provides. We'll start with the following table definition, closely based on the node table: function artwork_schema() { $schema['artwork'] = array( 'description' => 'The base table for artworks.', 'fields' => array( 'aid' => array( 'description' => 'The primary identifier for an artwork.', 'type' => 'serial', 'unsigned' => TRUE, 'not null' => TRUE, ), 'vid' => array( 'description' => 'The current {artwork_revision}.vid version identifier.', 'type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0, ), 'type' => array( 'description' => 'The {artwork_type} of this artwork.', 'type' => 'varchar', 'length' => 32, 'not null' => TRUE, 'default' => '', ), 'title' => array( 'description' => 'The title of this artwork.', 'type' => 'varchar', 'length' => 255, 'not null' => TRUE, [ 153 ]
Working with Content 'default' => '', ), 'created' => array( 'description' => 'The Unix timestamp when the artwork was created.', 'type' => 'int', 'not null' => TRUE, 'default' => 0, ), 'changed' => array( 'description' => 'The Unix timestamp when the artwork was most recently saved.', 'type' => 'int', 'not null' => TRUE, 'default' => 0, ), ), 'unique keys' => array( 'aid_vid' => array('aid', 'vid'), 'aid' => array('aid') ), 'primary key' => array('aid'), ); } return $schema; That looks like a lot of code, but it's really just another big Drupal array. The keys of the $schema array are the names of tables to be created. Each table is then defined as another nested array that defines the fields, indices, and other data about the table. Most are self-explanatory. See http://drupal.org/node/146843 for more information on the Schema API. Note that we're using an integer field called aid for our primary key. We also store the bundle that an artwork belongs to in a column called type (just like nodes), and we have a "version ID" field called vid. All entities can support versioning in a similar fashion to nodes, so let's build that in from the start. To store old revisions, we'll need another table as well. We'll call that table artwork_revision: $schema['artwork_revision'] = array( 'description' => 'Stores information about each saved version of an {artwork}.', [ 154 ]
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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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Page 169 and 170: Building an Admin Interface Debuggi
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Page 174 and 175: Working with Content Drupal 7 intro
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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
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Page 200 and 201: Chapter 6 array($artwork->aid => $a
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Page 204 and 205: Chapter 6 } foreach ($artworks as $
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Page 208 and 209: Chapter 7 Although an advanced topi
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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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