public function findOrCreateConferenceSchedule(Conference $conference)
 {
     $schedule = $this->findOneBy(['conference' => $conference]);
     if (!$schedule) {
         $schedule = PersonalSchedule::ofConference($conference);
         $this->getEntityManager()->persist($schedule);
     }
     return $schedule;
 }
 /**
  * @When I choose the :talk talk for my personal schedule of this conference
  * @When I try to choose the :talk talk for my personal schedule of this conference
  */
 public function iChooseTheTalkForMyPersonalScheduleOfThisConference(Talk $talk)
 {
     $this->personalSchedule = $this->personalSchedule ?: PersonalSchedule::ofConference($this->conference);
     try {
         $this->personalSchedule->chooseTalk($talk);
     } catch (\Exception $e) {
         $this->choiceException = $e;
     }
 }