@RequestMapping(value = "/edit/{id}", method = RequestMethod.POST)
    public ModelAndView edditingUser(Model model, @ModelAttribute User user,
            BindingResult result, @PathVariable Long id) {
        ModelAndView modelAndView = null;

        try { // tymczasowe, TODO: ustawienie avatara podczas edycji usera
            user.setAvatar(userService.getUser(user.getId()).getAvatar());
        } catch (BusinessException e) {
            log.error("setting old avatar", e);
        }

        UsersValidator userValidator = new UsersValidator();
        userValidator.validate(user, result);
        if (result.hasErrors()) {
            modelAndView = editUserPage(model, id);
            return modelAndView;
        }

        User temp = new User();
        temp.setId(user.getId());
        temp.setBossUser(user.getBossUser());

        try {


            if (userService.getUser(id).getId() == user.getBossUser().getId())
                throw new Exception("new boss, same as the user");

            //TODO: Aktualnie wyszukujemy po wszystkich userach, trzeba to zmienic, najlepiej utworzyc relacje dwustronna
            while(temp.getBossUser() != null)
            {

                if(temp.getId() == userService.getUser(id).getId())
                        throw new Exception("hierarchy error");
                temp = temp.getBossUser();
            }


            userService.updateUser(user);
            modelAndView = new ModelAndView("redirect:/user/list");
            String message = "User was successfully edited.";
            modelAndView.addObject("message", message);

        } catch (BusinessException e) {
            log.error("edditingUser", e);
            String message = "We were unable to update user id:" + id
                    + " due to: " + e.getLocalizedMessage();
            modelAndView = editUserPage(model, id);
            modelAndView.addObject("message", message);
        } catch (Exception e) {
            String message = "We were unable to update user id:" + id
                    + " due to: " + e.getLocalizedMessage();
            modelAndView = editUserPage(model, id);
            modelAndView.addObject("message", message);
        }
        return modelAndView;
    }