/**
  * Delivers related videos in JSON format.
  */
 public function getRelatedVideos()
 {
     $searchConfig = F::build('WikiaSearchConfig');
     if ($this->getVal('id', false)) {
         $searchConfig->setPageId($this->getVal('id'));
     }
     $searchConfig->setStart(0)->setSize(20);
     $mltResult = $this->wikiaSearch->getRelatedVideos($searchConfig);
     $responseData = array();
     foreach ($mltResult as $document) {
         $responseData[$document['url']] = $document->getFields();
     }
     $this->response->setData($responseData);
     $this->response->setFormat('json');
 }