/**
  * @param string[] $usernames
  *
  * @return ConfirmedMentionDto[]
  */
 public function fetchMentions(array $usernames)
 {
     $mentions = $this->mentionRepository->getMentionsByUsernames($usernames);
     $confirmedMentionsDto = [];
     foreach ($mentions as $mention) {
         $confirmedMentionDto = new ConfirmedMentionDto();
         $confirmedMentionDto->userId = $mention->getUserId();
         $confirmedMentionDto->username = $mention->getUsername();
         $confirmedMentionsDto[] = $confirmedMentionDto;
     }
     return $confirmedMentionsDto;
 }
 /**
  * @param ConfirmedMentionDto[] $mentionsDto
  *
  * @return Mention[]
  */
 public function map(array $mentionsDto) : array
 {
     $mentions = [];
     foreach ($mentionsDto as $mentionDto) {
         $mention = $this->mentionRepository->getByUserId($mentionDto->userId);
         if (null === $mention) {
             $mention = new Mention();
             $mention->setUserId($mentionDto->userId);
             $mention->setUsername($mentionDto->username);
         }
         $mentions[] = $mention;
     }
     return $mentions;
 }