function EntityReferenceEntityFormatter::viewElements

Overrides FormatterInterface::viewElements

File

core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceEntityFormatter.php, line 157

Class

EntityReferenceEntityFormatter

Plugin implementation of the 'entity reference rendered entity' formatter.

Namespace

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
    $view_mode = $this->getSetting('view_mode');
    $elements = [];
    foreach ($this->getEntitiesToView($items, $langcode) as $delta => $entity) {
        // Due to render caching and delayed calls, the viewElements() method
        // will be called later in the rendering process through a '#pre_render'
        // callback, so we need to generate a counter that takes into account
        // all the relevant information about this field and the referenced
        // entity that is being rendered.
        $recursive_render_id = $items->getFieldDefinition()
            ->getTargetEntityTypeId() . $items->getFieldDefinition()
            ->getTargetBundle() . $items->getName() . $items->getEntity()
            ->id() . $entity->getEntityTypeId() . $entity->id();
        if (isset(static::$recursiveRenderDepth[$recursive_render_id])) {
            static::$recursiveRenderDepth[$recursive_render_id]++;
        }
        else {
            static::$recursiveRenderDepth[$recursive_render_id] = 1;
        }
        // Protect ourselves from recursive rendering.
        if (static::$recursiveRenderDepth[$recursive_render_id] > static::RECURSIVE_RENDER_LIMIT) {
            $this->loggerFactory
                ->get('entity')
                ->error('Recursive rendering detected when rendering entity %entity_type: %entity_id, using the %field_name field on the %parent_entity_type:%parent_bundle %parent_entity_id entity. Aborting rendering.', [
                '%entity_type' => $entity->getEntityTypeId(),
                '%entity_id' => $entity->id(),
                '%field_name' => $items->getName(),
                '%parent_entity_type' => $items->getFieldDefinition()
                    ->getTargetEntityTypeId(),
                '%parent_bundle' => $items->getFieldDefinition()
                    ->getTargetBundle(),
                '%parent_entity_id' => $items->getEntity()
                    ->id(),
            ]);
            return $elements;
        }
        $view_builder = $this->entityTypeManager
            ->getViewBuilder($entity->getEntityTypeId());
        $elements[$delta] = $view_builder->view($entity, $view_mode, $entity->language()
            ->getId());
        // Add a resource attribute to set the mapping property's value to the
        // entity's url. Since we don't know what the markup of the entity will
        // be, we shouldn't rely on it for structured data such as RDFa.
        if (!empty($items[$delta]->_attributes) && !$entity->isNew() && $entity->hasLinkTemplate('canonical')) {
            $items[$delta]->_attributes += [
                'resource' => $entity->toUrl()
                    ->toString(),
            ];
        }
    }
    return $elements;
}