class SkipOnEmpty

Skips processing the current row when the input value is empty.

The skip_on_empty process plugin checks to see if the current input value is empty (empty string, NULL, FALSE, 0, '0', or an empty array). If so, the further processing of the property or the entire row (depending on the chosen method) is skipped and will not be migrated.

Available configuration keys:

• method: (optional) What to do if the input value is empty. Possible values:
  • row: Skips the entire row when an empty value is encountered.
  • process: Prevents further processing of the input property when the value is empty and sets the value to NULL.
• message: (optional) A message to be logged in the {migrate_message_*} table for this row. Messages are only logged for the 'row' method. If not set, nothing is logged in the message table.

Examples:

process:
  field_type_exists:
    plugin: skip_on_empty
    method: row
    source: field_name
    message: 'Field field_name is missing'

If 'field_name' is empty, the entire row is skipped and the message 'Field field_name is missing' is logged in the message table.

process:
  parent:
    -
      plugin: skip_on_empty
      method: process
      source: parent
    -
      plugin: migration_lookup
      migration: d6_taxonomy_term

If 'parent' is empty, any further processing of the property is skipped and the next process plugin (migration_lookup) will not be run. If the migration_lookup process is executed it will use 'parent' as the source. Combining skip_on_empty and migration_lookup is a typical process pipeline combination for hierarchical entities where the root entity does not have a parent.

process:
  parent:
    -
      plugin: skip_on_empty
      method: process
      source: parent
    -
      plugin: migration_lookup
      migration: d6_taxonomy_term
      source: original_term

If 'parent' is empty, any further processing of the property is skipped and the next process plugin (migration_lookup) will not be run. If the migration_lookup process is executed it will use 'original_term' as the source.

Attributes

Hierarchy

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

Expanded class hierarchy of SkipOnEmpty

See also

\Drupal\migrate\Plugin\MigrateProcessInterface

File

core/modules/migrate/src/Plugin/migrate/process/SkipOnEmpty.php, line 78

Namespace

class SkipOnEmpty extends ProcessPluginBase {
  
  /**
   * Skips the current row when value is not set.
   *
   * @param mixed $value
   *   The input value.
   * @param \Drupal\migrate\MigrateExecutableInterface $migrate_executable
   *   The migration in which this process is being executed.
   * @param \Drupal\migrate\Row $row
   *   The row from the source to process.
   * @param string $destination_property
   *   The destination property currently worked on. This is only used together
   *   with the $row above.
   *
   * @return mixed
   *   The input value, $value, if it is not empty.
   *
   * @throws \Drupal\migrate\MigrateSkipRowException
   *   Thrown if the source property is not set and the row should be skipped,
   *   records with STATUS_IGNORED status in the map.
   */
  public function row($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
    if (!$value) {
      $message = !empty($this->configuration['message']) ? $this->configuration['message'] : '';
      throw new MigrateSkipRowException($message);
    }
    return $value;
  }
  
  /**
   * Stops processing the current property when value is not set.
   *
   * @param mixed $value
   *   The input value.
   * @param \Drupal\migrate\MigrateExecutableInterface $migrate_executable
   *   The migration in which this process is being executed.
   * @param \Drupal\migrate\Row $row
   *   The row from the source to process.
   * @param string $destination_property
   *   The destination property currently worked on. This is only used together
   *   with the $row above.
   *
   * @return mixed
   *   The input value, $value, if it is not empty.
   */
  public function process($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
    if (!$value) {
      $this->stopPipeline();
      return NULL;
    }
    return $value;
  }

}

Members