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class Extract in Drupal 8

Same name and namespace in other branches
  1. 9 core/modules/migrate/src/Plugin/migrate/process/Extract.php \Drupal\migrate\Plugin\migrate\process\Extract

Extracts a value from an array.

The extract process plugin is used to pull data from an input array, which may have multiple levels. One use case is extracting data from field arrays in previous versions of Drupal. For instance, in Drupal 7, a field array would be indexed first by language, then by delta, then finally a key such as 'value'.

Available configuration keys:

  • source: The input value - must be an array.
  • index: The array of keys to access the value.
  • default: (optional) A default value to assign to the destination if the key does not exist.

Examples:


process:
  new_text_field:
    plugin: extract
    source: some_text_field
    index:
      - und
      - 0
      - value

The PHP equivalent of this would be:

$destination['new_text_field'] = $source['some_text_field']['und'][0]['value'];

If a default value is specified, it will be returned if the index does not exist in the input array.


plugin: extract
source: some_text_field
default: 'Default title'
index:
  - title

If $source['some_text_field']['title'] doesn't exist, then the plugin will return "Default title".

Plugin annotation


@MigrateProcessPlugin(
  id = "extract",
  handle_multiples = TRUE
)

Hierarchy

Expanded class hierarchy of Extract

See also

\Drupal\migrate\Plugin\MigrateProcessInterface

1 file declares its use of Extract
ExtractTest.php in core/modules/migrate/tests/src/Unit/process/ExtractTest.php

File

core/modules/migrate/src/Plugin/migrate/process/Extract.php, line 64

Namespace

Drupal\migrate\Plugin\migrate\process
View source
class Extract extends ProcessPluginBase {

  /**
   * {@inheritdoc}
   */
  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
    if (!is_array($value)) {
      throw new MigrateException('Input should be an array.');
    }
    $new_value = NestedArray::getValue($value, $this->configuration['index'], $key_exists);
    if (!$key_exists) {
      if (isset($this->configuration['default'])) {
        $new_value = $this->configuration['default'];
      }
      else {
        throw new MigrateException('Array index missing, extraction failed.');
      }
    }
    return $new_value;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
DependencySerializationTrait::$_entityStorages protected property An array of entity type IDs keyed by the property name of their storages.
DependencySerializationTrait::$_serviceIds protected property An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep public function 1
DependencySerializationTrait::__wakeup public function 2
Extract::transform public function Performs the associated process. Overrides ProcessPluginBase::transform
MessengerTrait::$messenger protected property The messenger. 29
MessengerTrait::messenger public function Gets the messenger. 29
MessengerTrait::setMessenger public function Sets the messenger.
PluginBase::$configuration protected property Configuration information passed into the plugin. 1
PluginBase::$pluginDefinition protected property The plugin implementation definition. 1
PluginBase::$pluginId protected property The plugin_id.
PluginBase::DERIVATIVE_SEPARATOR constant A string which is used to separate base plugin IDs from the derivative ID.
PluginBase::getBaseId public function Gets the base_plugin_id of the plugin instance. Overrides DerivativeInspectionInterface::getBaseId
PluginBase::getDerivativeId public function Gets the derivative_id of the plugin instance. Overrides DerivativeInspectionInterface::getDerivativeId
PluginBase::getPluginDefinition public function Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition 3
PluginBase::getPluginId public function Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
PluginBase::isConfigurable public function Determines if the plugin is configurable.
PluginBase::__construct public function Constructs a \Drupal\Component\Plugin\PluginBase object. 92
ProcessPluginBase::multiple public function Indicates whether the returned value requires multiple handling. Overrides MigrateProcessInterface::multiple 3
StringTranslationTrait::$stringTranslation protected property The string translation service. 1
StringTranslationTrait::formatPlural protected function Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals protected function Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation protected function Gets the string translation service.
StringTranslationTrait::setStringTranslation public function Sets the string translation service to use. 2
StringTranslationTrait::t protected function Translates a string to the current language or to a given language.