MIGRATE TO DRUPAL 8 FROM A CUSTOM SITE

RESSOURCES

• http://drupal.org/project/drupal
• http://drupal.org/project/migrate_plus
• http://www.drupal.org/project/console

MIGRATE IN DRUPAL 8

Migrate is now included in the Drupal core for making the upgrade path from 6.x and 7.x versions to Drupal 8.

Drupal 8 has two new modules :
Migrate: « Handles migrations »
Migrate Drupal : « Contains migrations from older Drupal versions. »

None of these module have a User Interface.

« Migrate » contains the core framework classes, the destination, source and process plugins schemas and definitions, and at last the migration config entity schema and definition.

« Migrate Drupal » contains implementations of destination, sources and process plugins for Drupal 6 and 7 you can use it or extend it, it’s ready to use. But this module doesn’t contain the configuration to migrate all you datas from your older Drupal site to Drupal 8.

The core provides templates of migration configuration entity that are located under each module of the core that needs one, under a folder named ‘migration_templates’ to find all the templates you can use this command in your Drupal 8 site:

To make a Drupal core to core migration, you will find all the infos here : https://www.Drupal.org/node/2257723 there is an UI in progress for upgrading.

A MIGRATION FRAMEWORK

Let have a look at each big piece of the migration framework :

SOURCE PLUGINS

Drupal provides an interface and base classes for the migration source plugin :

• SqlBase : Base class for SQL source, you need to extend this class to use it in your migration.
• SourcePluginBase : Base class for every custom source plugin.
• MenuLink: For D6/D7 menu links.
• EmptySource (id:empty): Plugin source that returns an empty row.
• …

PROCESS PLUGINS

There is the equivalent of the D7 MigrateFieldHandler but this is not reduced to fields or to a particular field type.
Its purpose is to transform a raw value into something acceptable by your new site schema.

The method transform() of the plugin is in charge of transforming your $value or skipping the entire row if needed.
If the source property has multiple values, the transform() will happen on each one.

Drupal provides migration process plugin into each module of the core that needs it (for the core upgrade),
To find out which one and where it is located you can use this command :

DESTINATION PLUGINS

Destination plugins are the classes that handle where your data are saved in the new Drupal 8 sites schemas.

Drupal provides a lot of useful destination classes :

• DestinationBase : Base class for migrate destination classes.
• Entity (id: entity) : Base class for entity destinations.
• Config (id: config) : Class for importing configuration entities.
• EntityBaseFieldOverride (id: entity:base_field_override): Class for importing base field.
• EntityConfigBase : Base class for importing configuration entities.
• EntityImageStyle (id: entity:image_style): Class for importing image_style.
• EntityContentBase (id: entity:%entity_type): The destination class for all content entities lacking a specific class.
• EntityNodeType: (id: entity:node_type): A class for migrate node type.
• EntityFile (id: entity:file): Class for migrate files.
• EntityFieldInstance: Class for migrate field instance.
• EntityFieldStorageConfig: Class for migrate field storage.
• EntityRevision, EntityViewMode, EntityUser, Book…
• And so more…

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