public function update(TournamentTeamRequest $request, TournamentTeam $tournament_teams)
 {
     foreach ($request->all()['data']['attributes'] as $key => $value) {
         if (isset($tournament_teams->{$key})) {
             $tournament_teams->{$key} = $value;
         }
     }
     // fetch tournament
     $tournament = Tournament::findOrFail($request->all()['data']['relationships']['tournament']['data']['id']);
     $tournament_teams->tournament_id = $tournament->id;
     $tournament_teams->save();
     $resource = new Item($tournament_teams, new TournamentTeamTransformer(), 'tournament-teams');
     return $this->fractal()->createData($resource)->toJson();
 }