public function survey(Request $request)
 {
     $request->session()->forget('identity');
     $identity = $this->identify($request, strtolower($request->input('netid')));
     $surveys = Survey::whereActive(true)->get();
     if (sizeof($identity->answers) < 1) {
         $survey = Survey::whereActive(true)->first();
         if ($survey) {
             return view('survey.form', ['survey' => $survey, 'identity' => $identity]);
         } else {
             return view('survey.404');
         }
     } else {
         $survey_ids = [];
         foreach ($identity->answers as $answer) {
             array_push($survey_ids, $answer['survey_id']);
         }
         foreach ($surveys as $survey) {
             if ($survey->repeat) {
                 if (!in_array($survey->id, $survey_ids) || !array_key_exists('repeat', $identity->answers[$survey->id])) {
                     return view('survey.form', ['survey' => $survey, 'identity' => $identity]);
                 }
             } else {
                 if (!in_array($survey->id, $survey_ids)) {
                     return view('survey.form', ['survey' => $survey, 'identity' => $identity]);
                 }
             }
         }
     }
     if ($surveys) {
         return view('survey.result');
     } else {
         return view('survey.404');
     }
     //return view('survey.form', ['survey' => $survey]);
     //return view('survey.index');
 }