public IActionResult Popust(int id = 0)
        {
            var model = new PopustPartialViewModel {
                PopustId = id
            };

            if (id != 0)
            {
                var popust = _popustService.GetPopust(id);
                model.Opis  = popust.Opis;
                model.Iznos = popust.Iznos * 100;
            }
            return(PartialView("_PopustPartialView", model));
        }
        public async Task <IActionResult> PopustAdd(PopustPartialViewModel model)
        {
            if (ModelState.IsValid)
            {
                _popustService.KreirajPopust(new Popust
                {
                    Iznos = (model.Iznos / 100) ?? 1,
                    Opis  = model.Opis
                });
                await _hubContext.Clients.All.SendAsync("RepopulatePopust");

                return(Ok("Ok"));
            }
            return(PartialView("_PopustPartialView", model));
        }