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Data migration to Drupal using Migrate Module

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Short guide on how to use the migrate module. Typo3 to drupal migration using the migrate module

Short guide on how to use the migrate module. Typo3 to drupal migration using the migrate module

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  • 1. Data migration to Drupal - Using the migrate module Ishan Mahajan DrupalCamp Delhi April, 2011
  • 2. Agenda● Migrate module● Steps to work with migrate module ● Hooks ● Building classes – Description – Adding source – Mapping – Process data● Walk through an example migration – TYPO3 to Drupal ● Code Heavy! - you may fall asleep
  • 3. Migrate Module● Provides a flexible framework for migrating content into Drupal● Supports core Drupal objects such as nodes, users, taxonomy terms and comments. ● Can define your own import handler ● Can define your own field handler● Supports migration from XML, JSON, CSV, Databases Cont...
  • 4. Migrate Module (cont..)● Incremental migrations● Drush commands for import, listing, status, rollback etc● Only status UI – all mappings must to be done in code
  • 5. Migration example● Migrate tt_news from TYPO3 to Drupal ● Talk about a small aspect of the migrate module (migrating nodes of type news) ● Not talking about creating own DestinationHandlers and FieldHandlers● Migrating from a MySQL database ● Both the database are on the same machine
  • 6. Steps to work with migrate
  • 7. Step 1: implement hook● Define your own module and let the migrate module know about it● Implement hook_migrate_api function mymodule_migrate_api() { return array( api => 2, ); }
  • 8. Step 2: define migration class● Give description● Let migrate know about the source of your content● Let migrate know about the destination type● Map the source and destination fields● Massage the data before being migrated.
  • 9. Step 2(contd)class Typo3NewsMigration extends Migration { public function __construct() { parent::__construct(); ... } public function prepare(stdClass $node, stdClass $row) { ... }}
  • 10. Functions● public function __construct() {..} ● Define the destination type(node, user, comment etc) ● Describe the source(databse, xml etc.) ● Field mappings● (optional) public function prepare(stdClass $node, stdClass $row) {..} ● Massage the data that was pulled in – clean up text, links etc.
  • 11. Step 2a: Give Description● Class description $this->description = t(News migration from TYPO3);● Dependencies $this->dependencies = array(Typo3NewsCategory);● Create map object - tracking the relationships between source row and Drupal object $this->map = new MigrateSQLMap($this->machineName, array( uid => array( type => int, alias => tn, ) ), MigrateDestinationNode::getKeySchema() );
  • 12. Step 2b: Setup source query$query = db_select(TYPO3_DATABASE_NAME . .tt_news, tn) ->fields(tn, array(uid, crdate, tstamp, pid, title, hidden, short, bodytext, author, author_email, image, imagecaption, links, ext_url, news_files)) ->fields(catmm, array(sorting, uid_foreign)); $query->condition(tn.deleted, 0); $query->leftJoin( TYPO3_DATABASE_NAME . .tt_news_cat_mm, catmm, catmm.uid_local = tn.uid); $query->leftJoin( TYPO3_DATABASE_NAME . .tt_news_cat, newscat, newscat.uid = catmm.uid_foreign); // Related news articles $query->leftJoin(TYPO3_DATABASE_NAME . .tt_news_related_mm, relatedmm, relatedmm.uid_local = tn.uid); $query->orderBy(tn.tstamp, ASC); $query->groupBy(tn.uid); $query->addExpression(GROUP_CONCAT(newscat.title), newstags); ... $this->source = new MigrateSourceSQL($query);NOTE: $query = Database::getConnection(for_typo3_migration, default);
  • 13. Incremental Migrations● Import items which have been added/edited since the last migration● “high-water” mark for each migration class $this->highwaterField = array( name => last_changed, // Column to be used as highwatermark alias => tn, // Table alias containing that column ); $query->orderBy(last_changed);
  • 14. Step 2c: Map the Data● Let the migrate module know the type of source$this->source = new MigrateSourceSQL($query);● Similarly provide the destination handler$this->destination = new MigrateDestinationNode(news);
  • 15. Step 2d: Map the fields● Field mapings take the form ● $this->addFieldMapping(‘destination_field_name’, ‘source_field_name’);● Can define default values ● $this->addFieldMapping(language) ->defaultValue(en);● File fields require additional arguments
  • 16. Step 2d(contd.)Fields// Mapped fields$this->addFieldMapping(title, title) ->description(t(Title of the node));$this->addFieldMapping(field_news_author_email, author_email);...// Image field$arguments = MigrateFileFieldHandler::arguments(drupal_get_path(module, news) . /pics, file_copy, FILE_EXISTS_RENAME);$this->addFieldMapping(field_news_images, image) ->arguments($arguments) ->separator(,);// just pass the taxonomy name$this->addFieldMapping(News Category, newstags) ->separator(,);// node reference field$this->addFieldMapping(field_news_related_articles, related_list) ->sourceMigration(Typo3News) ->separator(,);
  • 17. Step 3: Massage the data● On its way to Drupal!public function prepare(stdClass $node, stdClass $row) { $node->status = ($row->hidden) ? 0 : 1; $node->body = $this->processLinkTag($node->body);}
  • 18. Running the migrations● Drush commands: ● drush migrate-status ● drush migrate-import Typo3News – --itemlimit – --feedback – --idlist ● drush migrate-rollback Typo3News
  • 19. Resources● http://drupal.org/project/migrate● http://drupal.org/project/migrate_extras● http://cyrve.com/import● http://drupal.org/project/wordpress_migrate● http://bit.ly/iddTad● http://bit.ly/hONVVb
  • 20. Thank You :)ishan@srijan.in

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