withProps([ 'course_date' => null, 'preparation_time' => 0, 'subsequent_time' => 0, 'date_types' => $date_types ?? [], 'room_management_enabled' => Config::get()->RESOURCES_ENABLE, 'available_lecturers' => $available_lecturers ?? [], 'available_groups' => $available_groups ?? [], 'allow_multiple_room_bookings' => $allow_multiple_room_bookings ]) ?>