@RequestMapping(value = "/hotel/edit", method = RequestMethod.GET)
    public String editHotel(@RequestParam(required = false) Long hotelId, Model model) {
        HotelDTO hotel;
        if (hotelId==null)
            hotel = new HotelDTO();
        else
            hotel = hotelService.findHotel(hotelId);
        model.addAttribute("hotel", hotel);
        return "hotel-edit";
    }

    @RequestMapping(value = "/hotel/edit/submit", method = RequestMethod.POST)
    public String submitHotel(@ModelAttribute HotelDTO hotel, UriComponentsBuilder uriBuilder) {

        if(hotel.getId() == 0)
            hotelService.addHotel(hotel);
        else
            hotelService.updateHotel(hotel);

        return "redirect:" + uriBuilder.path("/hotels").build();
    }