class Callback

Passes the source value to a callback.

The callback process plugin allows simple processing of the value, such as strtolower(). To pass more than one argument, pass an array as the source and set the unpack_source option.

Available configuration keys:

• callable: The name of the callable method.
• unpack_source: (optional) Whether to interpret the source as an array of arguments.

Examples:

process:
  destination_field:
    plugin: callback
    callable: mb_strtolower
    source: source_field

An example where the callable is a static method in a class:

process:
  destination_field:
    plugin: callback
    callable:
      - '\Drupal\Component\Utility\Unicode'
      - ucfirst
    source: source_field

An example where the callback accepts no arguments:

process:
  time:
    plugin: callback
    callable: time
    unpack_source: true
    source: [  ]

An example where the callback accepts more than one argument:

source:
  plugin: source_plugin_goes_here
  constants:
    slash: /
process:
  field_link_url:
    plugin: callback
    callable: rtrim
    unpack_source: true
    source:
      - url
      - constants/slash

This will remove the trailing '/', if any, from a URL.

Plugin annotation

@MigrateProcessPlugin(
  id = "callback"
)

Hierarchy

• class \Drupal\Component\Plugin\PluginBase implements \Drupal\Component\Plugin\PluginInspectionInterface, \Drupal\Component\Plugin\DerivativeInspectionInterface
  • class \Drupal\Core\Plugin\PluginBase extends \Drupal\Component\Plugin\PluginBase uses \Drupal\Core\StringTranslation\StringTranslationTrait, \Drupal\Core\DependencyInjection\DependencySerializationTrait, \Drupal\Core\Messenger\MessengerTrait
    • class \Drupal\migrate\ProcessPluginBase extends \Drupal\Core\Plugin\PluginBase implements \Drupal\migrate\Plugin\MigrateProcessInterface
      • class \Drupal\migrate\Plugin\migrate\process\Callback extends \Drupal\migrate\ProcessPluginBase

Expanded class hierarchy of Callback

See also

\Drupal\migrate\Plugin\MigrateProcessInterface

File

core/modules/migrate/src/Plugin/migrate/process/Callback.php, line 80

Namespace

class Callback extends ProcessPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition) {
        if (!isset($configuration['callable'])) {
            throw new \InvalidArgumentException('The "callable" must be set.');
        }
        elseif (!is_callable($configuration['callable'])) {
            throw new \InvalidArgumentException('The "callable" must be a valid function or method.');
        }
        parent::__construct($configuration, $plugin_id, $plugin_definition);
    }
    
    /**
     * {@inheritdoc}
     */
    public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
        if (!empty($this->configuration['unpack_source'])) {
            if (!is_array($value)) {
                throw new MigrateException(sprintf("When 'unpack_source' is set, the source must be an array. Instead it was of type '%s'", gettype($value)));
            }
            return call_user_func($this->configuration['callable'], ...$value);
        }
        return call_user_func($this->configuration['callable'], $value);
    }

}

Members