/**
  * Validates the Player and the
  * Tournament relashionships
  *
  * @param Tournament $tournament
  * @param Player $player
  *
  * @throws Illuminate\Database\Eloquent\ModelNotFoundException
  */
 private function validatePlayer(Tournament $tournament, Player $player)
 {
     $tournament->players()->where('player_id', $player->id)->firstOrFail();
 }