/**
  * Method('POST')
  * @Validatetoken('token')
  * @Route('lectures/sendinvitation')
  * @param SpeakerInvitationInputModel $model
  */
 public function sendInvitation(SpeakerInvitationInputModel $model)
 {
     if (!$model->isValid()) {
         $this->redirect('Conferences', 'all');
     }
     $service = new LecturesService($this->dbContext);
     $result = $service->inviteSpeaker($model);
     $this->processResponse($result);
     $this->redirectToUrl('/conferences/details/' . $model->getConferenceId());
 }