/**
  * 
  * @param array $usr_ids
  * @param type $type
  */
 public function assignUsersToGroup(array $usr_ids)
 {
     global $ilCtrl;
     $group_id = (int) $_REQUEST['grp_id'];
     $tomorrow = new ilDateTime(time(), IL_CAL_UNIX);
     $tomorrow->increment(IL_CAL_DAY, 1);
     // Get all future consultation hours
     include_once './Services/Calendar/classes/ConsultationHours/class.ilConsultationHourAppointments.php';
     include_once './Services/Booking/classes/class.ilBookingEntry.php';
     $apps = ilConsultationHourAppointments::getAppointmentIdsByGroup($this->user_id, $group_id, $tomorrow);
     $users = $usr_ids;
     $assigned_users = array();
     foreach ($apps as $app) {
         $booking = ilBookingEntry::getInstanceByCalendarEntryId($app);
         foreach ($users as $user) {
             if ($booking->getCurrentNumberOfBookings($app) >= $booking->getNumberOfBookings()) {
                 break;
             }
             if (!ilBookingEntry::lookupBookingsOfUser($apps, $user)) {
                 include_once './Services/Calendar/classes/ConsultationHours/class.ilConsultationHourUtils.php';
                 ilConsultationHourUtils::bookAppointment($user, $app);
                 $assigned_users[] = $user;
             }
         }
     }
     $this->sendInfoAboutUnassignedUsers(array_diff($users, $assigned_users));
     $ilCtrl->redirect($this, 'bookingList');
 }