@GetMapping("/edit/{id}")
    public ModelAndView editDevice( @PathVariable("id") Long deviceId) {
        ModelAndView mav = new ModelAndView("device-form");
        mav.addObject("device", deviceRepository.findById(deviceId).orElseThrow(()-> new IllegalArgumentException("jakis tam tekst ze nie ma takiego obiektu")));
        return mav;
    }