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class EntityViewDisplay in Zircon Profile 8.0

Same name and namespace in other branches
  1. 8 core/lib/Drupal/Core/Entity/Entity/EntityViewDisplay.php \Drupal\Core\Entity\Entity\EntityViewDisplay

Configuration entity that contains display options for all components of a rendered entity in a given view mode.

Plugin annotation


@ConfigEntityType(
  id = "entity_view_display",
  label = @Translation("Entity view display"),
  entity_keys = {
    "id" = "id",
    "status" = "status"
  },
  config_export = {
    "id",
    "targetEntityType",
    "bundle",
    "mode",
    "content",
    "hidden",
  }
)

Hierarchy

Expanded class hierarchy of EntityViewDisplay

18 files declare their use of EntityViewDisplay
CommentRssTest.php in core/modules/comment/src/Tests/CommentRssTest.php
Contains \Drupal\comment\Tests\CommentRssTest.
DateTimeFieldTest.php in core/modules/datetime/src/Tests/DateTimeFieldTest.php
Contains \Drupal\datetime\Tests\DateTimeFieldTest.
EntityDisplayTest.php in core/modules/field_ui/src/Tests/EntityDisplayTest.php
Contains \Drupal\field_ui\Tests\EntityDisplayTest.
EntityFieldRenderer.php in core/modules/views/src/Entity/Render/EntityFieldRenderer.php
Contains \Drupal\views\Entity\Render\EntityFieldRenderer.
EntityReferenceXSSTest.php in core/modules/field/src/Tests/EntityReference/EntityReferenceXSSTest.php
Contains \Drupal\field\Tests\EntityReference\EntityReferenceXSSTest.

... See full list

File

core/lib/Drupal/Core/Entity/Entity/EntityViewDisplay.php, line 39
Contains \Drupal\Core\Entity\Entity\EntityViewDisplay.

Namespace

Drupal\Core\Entity\Entity
View source 
class EntityViewDisplay extends EntityDisplayBase implements EntityViewDisplayInterface {

  /**
   * {@inheritdoc}
   */
  protected $displayContext = 'view';

  /**
   * Returns the display objects used to render a set of entities.
   *
   * Depending on the configuration of the view mode for each bundle, this can
   * be either the display object associated with the view mode, or the
   * 'default' display.
   *
   * This method should only be used internally when rendering an entity. When
   * assigning suggested display options for a component in a given view mode,
   * entity_get_display() should be used instead, in order to avoid
   * inadvertently modifying the output of other view modes that might happen to
   * use the 'default' display too. Those options will then be effectively
   * applied only if the view mode is configured to use them.
   *
   * hook_entity_view_display_alter() is invoked on each display, allowing 3rd
   * party code to alter the display options held in the display before they are
   * used to generate render arrays.
   *
   * @param \Drupal\Core\Entity\FieldableEntityInterface[] $entities
   *   The entities being rendered. They should all be of the same entity type.
   * @param string $view_mode
   *   The view mode being rendered.
   *
   * @return \Drupal\Core\Entity\Display\EntityViewDisplayInterface[]
   *   The display objects to use to render the entities, keyed by entity
   *   bundle.
   *
   * @see entity_get_display()
   * @see hook_entity_view_display_alter()
   */
  public static function collectRenderDisplays($entities, $view_mode) {
    if (empty($entities)) {
      return array();
    }

    // Collect entity type and bundles.
    $entity_type = current($entities)
      ->getEntityTypeId();
    $bundles = array();
    foreach ($entities as $entity) {
      $bundles[$entity
        ->bundle()] = TRUE;
    }
    $bundles = array_keys($bundles);

    // For each bundle, check the existence and status of:
    // - the display for the view mode,
    // - the 'default' display.
    $candidate_ids = array();
    foreach ($bundles as $bundle) {
      if ($view_mode != 'default') {
        $candidate_ids[$bundle][] = $entity_type . '.' . $bundle . '.' . $view_mode;
      }
      $candidate_ids[$bundle][] = $entity_type . '.' . $bundle . '.default';
    }
    $results = \Drupal::entityQuery('entity_view_display')
      ->condition('id', NestedArray::mergeDeepArray($candidate_ids))
      ->condition('status', TRUE)
      ->execute();

    // For each bundle, select the first valid candidate display, if any.
    $load_ids = array();
    foreach ($bundles as $bundle) {
      foreach ($candidate_ids[$bundle] as $candidate_id) {
        if (isset($results[$candidate_id])) {
          $load_ids[$bundle] = $candidate_id;
          break;
        }
      }
    }

    // Load the selected displays.
    $storage = \Drupal::entityManager()
      ->getStorage('entity_view_display');
    $displays = $storage
      ->loadMultiple($load_ids);
    $displays_by_bundle = array();
    foreach ($bundles as $bundle) {

      // Use the selected display if any, or create a fresh runtime object.
      if (isset($load_ids[$bundle])) {
        $display = $displays[$load_ids[$bundle]];
      }
      else {
        $display = $storage
          ->create(array(
          'targetEntityType' => $entity_type,
          'bundle' => $bundle,
          'mode' => $view_mode,
          'status' => TRUE,
        ));
      }

      // Let the display know which view mode was originally requested.
      $display->originalMode = $view_mode;

      // Let modules alter the display.
      $display_context = array(
        'entity_type' => $entity_type,
        'bundle' => $bundle,
        'view_mode' => $view_mode,
      );
      \Drupal::moduleHandler()
        ->alter('entity_view_display', $display, $display_context);
      $displays_by_bundle[$bundle] = $display;
    }
    return $displays_by_bundle;
  }

  /**
   * Returns the display object used to render an entity.
   *
   * See the collectRenderDisplays() method for details.
   *
   * @param \Drupal\Core\Entity\FieldableEntityInterface $entity
   *   The entity being rendered.
   * @param string $view_mode
   *   The view mode.
   *
   * @return \Drupal\Core\Entity\Display\EntityViewDisplayInterface
   *   The display object that should be used to render the entity.
   *
   * @see \Drupal\Core\Entity\Entity\EntityViewDisplay::collectRenderDisplays()
   */
  public static function collectRenderDisplay(FieldableEntityInterface $entity, $view_mode) {
    $displays = static::collectRenderDisplays(array(
      $entity,
    ), $view_mode);
    return $displays[$entity
      ->bundle()];
  }

  /**
   * {@inheritdoc}
   */
  public function __construct(array $values, $entity_type) {
    $this->pluginManager = \Drupal::service('plugin.manager.field.formatter');
    parent::__construct($values, $entity_type);
  }

  /**
   * {@inheritdoc}
   */
  public function postSave(EntityStorageInterface $storage, $update = TRUE) {

    // Reset the render cache for the target entity type.
    parent::postSave($storage, $update);
    if (\Drupal::entityManager()
      ->hasHandler($this->targetEntityType, 'view_builder')) {
      \Drupal::entityManager()
        ->getViewBuilder($this->targetEntityType)
        ->resetCache();
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getRenderer($field_name) {
    if (isset($this->plugins[$field_name])) {
      return $this->plugins[$field_name];
    }

    // Instantiate the formatter object from the stored display properties.
    if (($configuration = $this
      ->getComponent($field_name)) && isset($configuration['type']) && ($definition = $this
      ->getFieldDefinition($field_name))) {
      $formatter = $this->pluginManager
        ->getInstance(array(
        'field_definition' => $definition,
        'view_mode' => $this->originalMode,
        // No need to prepare, defaults have been merged in setComponent().
        'prepare' => FALSE,
        'configuration' => $configuration,
      ));
    }
    else {
      $formatter = NULL;
    }

    // Persist the formatter object.
    $this->plugins[$field_name] = $formatter;
    return $formatter;
  }

  /**
   * {@inheritdoc}
   */
  public function build(FieldableEntityInterface $entity) {
    $build = $this
      ->buildMultiple(array(
      $entity,
    ));
    return $build[0];
  }

  /**
   * {@inheritdoc}
   */
  public function buildMultiple(array $entities) {
    $build_list = array();
    foreach ($entities as $key => $entity) {
      $build_list[$key] = array();
    }

    // Run field formatters.
    foreach ($this
      ->getComponents() as $name => $options) {
      if ($formatter = $this
        ->getRenderer($name)) {

        // Group items across all entities and pass them to the formatter's
        // prepareView() method.
        $grouped_items = array();
        foreach ($entities as $id => $entity) {
          $items = $entity
            ->get($name);
          $items
            ->filterEmptyItems();
          $grouped_items[$id] = $items;
        }
        $formatter
          ->prepareView($grouped_items);

        // Then let the formatter build the output for each entity.
        foreach ($entities as $id => $entity) {
          $items = $grouped_items[$id];

          /** @var \Drupal\Core\Access\AccessResultInterface $field_access */
          $field_access = $items
            ->access('view', NULL, TRUE);

          // The language of the field values to display is already determined
          // in the incoming $entity. The formatter should build its output of
          // those values using:
          // - the entity language if the entity is translatable,
          // - the current "content language" otherwise.
          if ($entity instanceof TranslatableInterface && $entity
            ->isTranslatable()) {
            $view_langcode = $entity
              ->language()
              ->getId();
          }
          else {
            $view_langcode = NULL;
          }
          $build_list[$id][$name] = $field_access
            ->isAllowed() ? $formatter
            ->view($items, $view_langcode) : [];

          // Apply the field access cacheability metadata to the render array.
          $this->renderer
            ->addCacheableDependency($build_list[$id][$name], $field_access);
        }
      }
    }
    foreach ($entities as $id => $entity) {

      // Assign the configured weights.
      foreach ($this
        ->getComponents() as $name => $options) {
        if (isset($build_list[$id][$name])) {
          $build_list[$id][$name]['#weight'] = $options['weight'];
        }
      }

      // Let other modules alter the renderable array.
      $context = array(
        'entity' => $entity,
        'view_mode' => $this->originalMode,
        'display' => $this,
      );
      \Drupal::moduleHandler()
        ->alter('entity_display_build', $build_list[$key], $context);
    }
    return $build_list;
  }

  /**
   * {@inheritdoc}
   */
  public function getPluginCollections() {
    $configurations = array();
    foreach ($this
      ->getComponents() as $field_name => $configuration) {
      if (!empty($configuration['type']) && ($field_definition = $this
        ->getFieldDefinition($field_name))) {
        $configurations[$configuration['type']] = $configuration + array(
          'field_definition' => $field_definition,
          'view_mode' => $this->originalMode,
        );
      }
    }
    return array(
      'formatters' => new EntityDisplayPluginCollection($this->pluginManager, $configurations),
    );
  }

}

Members

Namesort descending Modifiers Type Description Overrides
ConfigEntityBase::$isSyncing private property Whether the config is being created, updated or deleted through the import process.
ConfigEntityBase::$isUninstalling private property Whether the config is being deleted by the uninstall process.
ConfigEntityBase::$langcode protected property The language code of the entity's default language.
ConfigEntityBase::$originalId protected property The original ID of the configuration entity.
ConfigEntityBase::$pluginConfigKey protected property The name of the property that is used to store plugin configuration.
ConfigEntityBase::$third_party_settings protected property Third party entity settings.
ConfigEntityBase::$trustedData protected property Trust supplied data and not use configuration schema on save.
ConfigEntityBase::$uuid protected property The UUID for this entity.
ConfigEntityBase::addDependency protected function Overrides \Drupal\Core\Entity\DependencyTrait:addDependency().
ConfigEntityBase::createDuplicate public function Creates a duplicate of the entity. Overrides Entity::createDuplicate 1
ConfigEntityBase::disable public function Disables the configuration entity. Overrides ConfigEntityInterface::disable 1
ConfigEntityBase::enable public function Enables the configuration entity. Overrides ConfigEntityInterface::enable
ConfigEntityBase::get public function Returns the value of a property. Overrides ConfigEntityInterface::get
ConfigEntityBase::getCacheTagsToInvalidate public function Returns the cache tags that should be used to invalidate caches. Overrides Entity::getCacheTagsToInvalidate 1
ConfigEntityBase::getConfigDependencyName public function Gets the configuration dependency name. Overrides Entity::getConfigDependencyName
ConfigEntityBase::getConfigManager protected static function Gets the configuration manager.
ConfigEntityBase::getConfigTarget public function Gets the configuration target identifier for the entity. Overrides Entity::getConfigTarget
ConfigEntityBase::getDependencies public function Gets the configuration dependencies. Overrides ConfigEntityInterface::getDependencies
ConfigEntityBase::getOriginalId public function Gets the original ID. Overrides Entity::getOriginalId
ConfigEntityBase::getThirdPartyProviders public function Gets the list of third parties that store information. Overrides ThirdPartySettingsInterface::getThirdPartyProviders
ConfigEntityBase::getThirdPartySetting public function Gets the value of a third-party setting. Overrides ThirdPartySettingsInterface::getThirdPartySetting
ConfigEntityBase::getThirdPartySettings public function Gets all third-party settings of a given module. Overrides ThirdPartySettingsInterface::getThirdPartySettings
ConfigEntityBase::getTypedConfig protected function Gets the typed config manager.
ConfigEntityBase::hasTrustedData public function Gets whether on not the data is trusted. Overrides ConfigEntityInterface::hasTrustedData
ConfigEntityBase::invalidateTagsOnDelete protected static function Override to never invalidate the individual entities' cache tags; the config system already invalidates them. Overrides Entity::invalidateTagsOnDelete
ConfigEntityBase::invalidateTagsOnSave protected function Override to never invalidate the entity's cache tag; the config system already invalidates it. Overrides Entity::invalidateTagsOnSave
ConfigEntityBase::isInstallable public function Checks whether this entity is installable. Overrides ConfigEntityInterface::isInstallable 2
ConfigEntityBase::isNew public function Overrides Entity::isNew(). Overrides Entity::isNew
ConfigEntityBase::isSyncing public function Returns whether this entity is being changed as part of an import process. Overrides ConfigEntityInterface::isSyncing
ConfigEntityBase::isUninstalling public function Returns whether this entity is being changed during the uninstall process. Overrides ConfigEntityInterface::isUninstalling
ConfigEntityBase::link public function Deprecated way of generating a link to the entity. See toLink(). Overrides Entity::link
ConfigEntityBase::preDelete public static function Acts on entities before they are deleted and before hooks are invoked. Overrides Entity::preDelete 7
ConfigEntityBase::save public function Saves an entity permanently. Overrides Entity::save 1
ConfigEntityBase::set public function Sets the value of a property. Overrides ConfigEntityInterface::set 1
ConfigEntityBase::setOriginalId public function Sets the original ID. Overrides Entity::setOriginalId
ConfigEntityBase::setStatus public function Sets the status of the configuration entity. Overrides ConfigEntityInterface::setStatus 1
ConfigEntityBase::setSyncing public function Sets the status of the isSyncing flag. Overrides ConfigEntityInterface::setSyncing
ConfigEntityBase::setThirdPartySetting public function Sets the value of a third-party setting. Overrides ThirdPartySettingsInterface::setThirdPartySetting
ConfigEntityBase::setUninstalling public function
ConfigEntityBase::sort public static function Helper callback for uasort() to sort configuration entities by weight and label. 6
ConfigEntityBase::status public function Returns whether the configuration entity is enabled. Overrides ConfigEntityInterface::status 2
ConfigEntityBase::toUrl public function Gets the URL object for the entity. Overrides Entity::toUrl
ConfigEntityBase::trustData public function Sets that the data should be trusted. Overrides ConfigEntityInterface::trustData 1
ConfigEntityBase::unsetThirdPartySetting public function Unsets a third-party setting. Overrides ThirdPartySettingsInterface::unsetThirdPartySetting
ConfigEntityBase::url public function Gets the public URL for this entity. Overrides Entity::url
ConfigEntityBase::urlInfo public function Gets the URL object for the entity. Overrides Entity::urlInfo
DependencySerializationTrait::$_serviceIds protected property An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep public function Aliased as: traitSleep 1
DependencyTrait::$dependencies protected property The object's dependencies. 1
DependencyTrait::addDependencies protected function Adds multiple dependencies.
DependencyTrait::addDependency protected function Adds a dependency. Aliased as: addDependencyTrait
Entity::$enforceIsNew protected property Boolean indicating whether the entity should be forced to be new.
Entity::$entityTypeId protected property The entity type.
Entity::$typedData protected property A typed data object wrapping this entity.
Entity::access public function Checks data value access. Overrides AccessibleInterface::access 1
Entity::bundle public function Gets the bundle of the entity. Overrides EntityInterface::bundle 1
Entity::create public static function Overrides EntityInterface::create
Entity::delete public function Deletes an entity permanently. Overrides EntityInterface::delete 2
Entity::enforceIsNew public function Enforces an entity to be new. Overrides EntityInterface::enforceIsNew
Entity::entityManager Deprecated protected function Gets the entity manager.
Entity::entityTypeManager protected function Gets the entity type manager.
Entity::getCacheContexts public function The cache contexts associated with this object. Overrides RefinableCacheableDependencyTrait::getCacheContexts
Entity::getCacheMaxAge public function The maximum age for which this object may be cached. Overrides RefinableCacheableDependencyTrait::getCacheMaxAge
Entity::getCacheTags public function The cache tags associated with this object. Overrides RefinableCacheableDependencyTrait::getCacheTags
Entity::getConfigDependencyKey public function Gets the key that is used to store configuration dependencies. Overrides EntityInterface::getConfigDependencyKey
Entity::getEntityType public function Gets the entity type definition. Overrides EntityInterface::getEntityType
Entity::getEntityTypeId public function Gets the ID of the type of the entity. Overrides EntityInterface::getEntityTypeId
Entity::getTypedData public function Gets a typed data object for this entity object. Overrides EntityInterface::getTypedData
Entity::hasLinkTemplate public function Indicates if a link template exists for a given key. Overrides EntityInterface::hasLinkTemplate
Entity::label public function Gets the label of the entity. Overrides EntityInterface::label 5
Entity::language public function Gets the language of the entity. Overrides EntityInterface::language 1
Entity::languageManager protected function Gets the language manager.
Entity::linkTemplates protected function Gets an array link templates. 1
Entity::load public static function Overrides EntityInterface::load
Entity::loadMultiple public static function Overrides EntityInterface::loadMultiple
Entity::postCreate public function Acts on an entity after it is created but before hooks are invoked. Overrides EntityInterface::postCreate 4
Entity::postDelete public static function Acts on deleted entities before the delete hook is invoked. Overrides EntityInterface::postDelete 14
Entity::postLoad public static function Acts on loaded entities. Overrides EntityInterface::postLoad 2
Entity::preCreate public static function Changes the values of an entity before it is created. Overrides EntityInterface::preCreate 6
Entity::referencedEntities public function Gets a list of entities referenced by this entity. Overrides EntityInterface::referencedEntities 1
Entity::toLink public function Generates the HTML for a link to this entity. Overrides EntityInterface::toLink
Entity::uriRelationships public function Returns a list of URI relationships supported by this entity. Overrides EntityInterface::uriRelationships
Entity::urlRouteParameters protected function Gets an array of placeholders for this entity. 1
Entity::uuid public function Gets the entity UUID (Universally Unique Identifier). Overrides EntityInterface::uuid 1
Entity::uuidGenerator protected function Gets the UUID generator.
EntityDisplayBase::$bundle protected property Bundle to be displayed.
EntityDisplayBase::$content protected property List of component display options, keyed by component name.
EntityDisplayBase::$fieldDefinitions protected property A list of field definitions eligible for configuration in this display.
EntityDisplayBase::$hidden protected property List of components that are set to be hidden.
EntityDisplayBase::$id protected property Unique ID for the config entity.
EntityDisplayBase::$mode protected property View or form mode to be displayed.
EntityDisplayBase::$originalMode protected property The original view or form mode that was requested (case of view/form modes being configured to fall back to the 'default' display).
EntityDisplayBase::$pluginManager protected property The plugin manager used by this entity type.
EntityDisplayBase::$plugins protected property The plugin objects used for this display, keyed by field name.
EntityDisplayBase::$renderer protected property The renderer.
EntityDisplayBase::$status protected property Whether this display is enabled or not. If the entity (form) display is disabled, we'll fall back to the 'default' display. Overrides ConfigEntityBase::$status
EntityDisplayBase::$targetEntityType protected property Entity type to be displayed.
EntityDisplayBase::calculateDependencies public function Calculates dependencies and stores them in the dependency property. Overrides ConfigEntityBase::calculateDependencies
EntityDisplayBase::createCopy public function Creates a duplicate of the entity display object on a different view mode. Overrides EntityDisplayInterface::createCopy
EntityDisplayBase::CUSTOM_MODE constant The 'mode' for runtime EntityDisplay objects used to render entities with arbitrary display options rather than a configured view mode or form mode.
EntityDisplayBase::fieldHasDisplayOptions private function Determines if a field has options for a given display.
EntityDisplayBase::getComponent public function Gets the display options set for a component. Overrides EntityDisplayInterface::getComponent
EntityDisplayBase::getComponents public function Gets the display options for all components. Overrides EntityDisplayInterface::getComponents
EntityDisplayBase::getFieldDefinition protected function Gets the field definition of a field.
EntityDisplayBase::getFieldDefinitions protected function Gets the definitions of the fields that are candidate for display.
EntityDisplayBase::getHighestWeight public function Gets the highest weight of the components in the display. Overrides EntityDisplayInterface::getHighestWeight
EntityDisplayBase::getLogger protected function Provides the 'system' channel logger service.
EntityDisplayBase::getMode public function Gets the view or form mode to be displayed. Overrides EntityDisplayInterface::getMode
EntityDisplayBase::getOriginalMode public function Gets the original view or form mode that was requested. Overrides EntityDisplayInterface::getOriginalMode
EntityDisplayBase::getPluginRemovedDependencies protected function Returns the plugin dependencies being removed.
EntityDisplayBase::getTargetBundle public function Gets the bundle to be displayed. Overrides EntityDisplayInterface::getTargetBundle
EntityDisplayBase::getTargetEntityTypeId public function Gets the entity type for which this display is used. Overrides EntityDisplayInterface::getTargetEntityTypeId
EntityDisplayBase::id public function Gets the identifier. Overrides Entity::id
EntityDisplayBase::init protected function Initializes the display.
EntityDisplayBase::onDependencyRemoval public function Informs the entity that entities it depends on will be deleted. Overrides ConfigEntityBase::onDependencyRemoval
EntityDisplayBase::preSave public function Acts on an entity before the presave hook is invoked. Overrides ConfigEntityBase::preSave
EntityDisplayBase::removeComponent public function Sets a component to be hidden. Overrides EntityDisplayInterface::removeComponent
EntityDisplayBase::setComponent public function Sets the display options for a component. Overrides EntityDisplayInterface::setComponent
EntityDisplayBase::setTargetBundle public function Sets the bundle to be displayed. Overrides EntityDisplayInterface::setTargetBundle
EntityDisplayBase::toArray public function Gets an array of all property values. Overrides ConfigEntityBase::toArray
EntityDisplayBase::__sleep public function Overrides Entity::__sleep
EntityDisplayBase::__wakeup public function Overrides DependencySerializationTrait::__wakeup
EntityViewDisplay::$displayContext protected property Context in which this entity will be used (e.g. 'display', 'form'). Overrides EntityDisplayBase::$displayContext
EntityViewDisplay::build public function Builds a renderable array for the components of an entity. Overrides EntityViewDisplayInterface::build
EntityViewDisplay::buildMultiple public function Builds a renderable array for the components of a set of entities. Overrides EntityViewDisplayInterface::buildMultiple
EntityViewDisplay::collectRenderDisplay public static function Returns the display object used to render an entity.
EntityViewDisplay::collectRenderDisplays public static function Returns the display objects used to render a set of entities.
EntityViewDisplay::getPluginCollections public function Gets the plugin collections used by this entity. Overrides EntityWithPluginCollectionInterface::getPluginCollections
EntityViewDisplay::getRenderer public function Gets the renderer plugin for a field (e.g. widget, formatter). Overrides EntityDisplayInterface::getRenderer
EntityViewDisplay::postSave public function Acts on a saved entity before the insert or update hook is invoked. Overrides Entity::postSave
EntityViewDisplay::__construct public function Constructs an Entity object. Overrides EntityDisplayBase::__construct
PluginDependencyTrait::calculatePluginDependencies protected function Calculates and adds dependencies of a specific plugin instance. 1
RefinableCacheableDependencyTrait::$cacheContexts protected property Cache contexts.
RefinableCacheableDependencyTrait::$cacheMaxAge protected property Cache max-age.
RefinableCacheableDependencyTrait::$cacheTags protected property Cache tags.
RefinableCacheableDependencyTrait::addCacheableDependency public function 1
RefinableCacheableDependencyTrait::addCacheContexts public function
RefinableCacheableDependencyTrait::addCacheTags public function
RefinableCacheableDependencyTrait::mergeCacheMaxAge public function