class Rss

class Rss extends RssPluginBase {
  
  /**
   * The table the aggregator item is using for storage.
   *
   * @var string
   */
  public $base_table = 'aggregator_item';
  
  /**
   * The actual field which is used to identify an aggregator item.
   *
   * @var string
   */
  public $base_field = 'iid';
  
  /**
   * {@inheritdoc}
   */
  protected $entityTypeId = 'aggregator_item';
  
  /**
   * {@inheritdoc}
   */
  public function render($row) {
    $entity = $row->_entity;
    $item = new \stdClass();
    foreach ($entity as $name => $field) {
      $item->{$name} = $field->value;
    }
    $item->elements = [
      [
        'key' => 'pubDate',
        // views_view_row_rss takes care about the escaping.
'value' => gmdate('r', $entity->timestamp->value),
      ],
      [
        'key' => 'dc:creator',
        // views_view_row_rss takes care about the escaping.
'value' => $entity->author->value,
      ],
      [
        'key' => 'guid',
        // views_view_row_rss takes care about the escaping.
'value' => $entity->guid->value,
        'attributes' => [
          'isPermaLink' => 'false',
        ],
      ],
    ];
    $build = [
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#options' => $this->options,
      '#row' => $item,
    ];
    return $build;
  }

}