public function index()
 {
     $project = $this->validateProject(Input::get('project'));
     $cruiseQuery = $project ? Cruises::whereProject($project) : Cruises::getQuery();
     $exportQuery = $project ? Export::whereProject($project) : Export::getQuery();
     $exports = $exportQuery->orderBy('id', 'desc')->take(self::EXPORT_PAGE_SIZE)->get();
     $avg = $cruiseQuery->select(DB::raw($this->buildSelectSQL()))->first();
     return view('admin.cruise')->with('project', $project)->with('exports', $exports)->with('avg', $avg);
 }