/**
  * Run the migrations.
  *
  * @return void
  */
 public function up()
 {
     Schema::table('correlations', function (Blueprint $table) {
         //
     });
     $entries = Correlation::where('unittype', 'college')->get();
     foreach ($entries as $entry) {
         $batch = $entry->batch;
         $collegeid = $entry->collegeid;
         $dropoutsRaw = Studentdropout::getBatchDropoutsCollege($batch * 100000, $collegeid);
         $shiftsRaw = Studentshift::getBatchShiftsCollege($batch * 100000, $collegeid);
         $delayedRaw = Studentdelayed::getBatchDelayedCollege($batch * 100000, $collegeid);
         $studentids = [];
         foreach ($dropoutsRaw as $doRaw) {
             array_push($studentids, $doRaw->studentid);
         }
         foreach ($shiftsRaw as $sRaw) {
             array_push($studentids, $sRaw->studentid);
         }
         foreach ($delayedRaw as $dRaw) {
             array_push($studentids, $dRaw->studentid);
         }
         $studentids = array_values(array_unique($studentids));
         $students = Studentterm::getBatchStudentsCountCollege($batch * 100000, $collegeid);
         if ($students > 0) {
             $entry->dropouts = count($studentids) / $students;
         } else {
             $entry->dropouts = 0;
         }
         $entry->save();
     }
 }