@PostMapping("/stands/add")
    public BikeStation createPosition(@RequestBody NewPositions newPositions){
        BikeStation bikeStation = bikeStationRepository.findOneById(newPositions.getStationId());
        for (int i = 0; i < newPositions.getNumberOfNewPositions(); i++){
            bikeStation.getStands().add(new Stand(Stand.isAvailable.YES));
        }
        bikeStationRepository.save(bikeStation);
        return bikeStation;
    }


public interface BikeStationRepository extends CrudRepository<BikeStation, Integer> {
    BikeStation findOneById(int id);
}