/**
  * Check if user is participant to a conversation
  *
  * @param ConversationInterface $conversation
  * @param UserInterface $user
  * @return bool
  */
 public function isParticipant(ConversationInterface $conversation, UserInterface $user)
 {
     foreach ($conversation->getParticipants() as $participant) {
         if ($participant->getUser() === $user->getId()) {
             return true;
         }
     }
     return false;
 }
 /**
  * Find user conversation
  *
  * @param UserInterface $user
  * @return array|\LaravelPM\Models\ParticipantInterface[]
  */
 public function getUserConversations(UserInterface $user)
 {
     $query = $this->objectManager->createQuery(sprintf('select
           p
         from
           %s p
         where
           p.user = :userId', $this->participantModel));
     $query->setParameter('userId', $user->getId());
     /** @var ParticipantInterface[]|array $participantLinks */
     $participantLinks = $query->getResult();
     /** @var ConversationInterface $conversations */
     $conversations = [];
     foreach ($participantLinks as $participantLink) {
         $conversations[] = $participantLink->getConversation();
     }
     return $conversations;
 }