/** 
  * Run the migrations.
  *
  * @return void
  */
 public function up()
 {
     Activity::chunk(200, function ($activities) {
         foreach ($activities as $activity) {
             if ($activity->date_begin && $activity->date_end) {
                 $activity->time_restriction = Activity::TIME_RESTRICT_DAYS;
             } elseif (!empty($activity->time_restriction_data)) {
                 $activity->time_restriction = Activity::TIME_RESTRICT_HOURS;
             } else {
                 $activity->time_restriction = Activity::TIME_RESTRICT_NONE;
             }
             $activity->save();
         }
     });
 }