@PutMapping("/apartments")
public Boolean editApartment(@RequestBody @RequestParam(value = "id", required = true) Integer id,
                             @RequestParam(value = "flats_number", required = true) Integer flats_number,
                             @RequestParam(value = "cost", required = true) Integer cost,
                             @RequestParam(value = "description", required = true) String description,
                             @RequestParam(value = "address", required = true) String address,
                             @RequestParam(value = "img_url", required = true) String img_url) {
    try {
        Optional<Apartment> test = apartmentRepository.findById(id);
        if (!test.isPresent())
            return false;
        Apartment apartment = new Apartment(flats_number, cost, description, address, img_url);
        apartmentRepository.save(apartment);
        return true;
    } catch (Exception e) {
        return false;
    }
}

Optional<Apartment> test = apartmentRepository.findById(id);
            if (!test.isPresent())
                return false;
            Apartment apartment = test.get();
            apartment.setFlatsNumber(flats_number);
            apartment.setCost(cost);
            apartment.setDescription(description);
            apartment.setImgUrl(img_url);
            apartmentRepository.save(apartment);
            return true;