public ActionResult Save(Movie movie)
        {
            //sprawdza poprawność powiązania wartości przychodzących z żądaniami do modelu
            if (!ModelState.IsValid)
            {
                var modelView = new MovieFormModelView(movie)
                {
                    Genres = _context.Genres.ToList()
                };
                return(View("MovieForm", modelView));
            }

            if (movie.Id == 0)
            {
                _context.Movies.Add(movie);
            }
            else
            {
                var movieInDb = _context.Movies.Single(m => m.Id == movie.Id);
                movieInDb.Name          = movie.Name;
                movieInDb.GenreId       = movie.GenreId;
                movieInDb.NumberInStock = movie.NumberInStock;
                movieInDb.ReleaseDate   = movie.ReleaseDate;
            }

            _context.SaveChanges();


            return(RedirectToAction("Index", "Movies"));
        }
        public ViewResult New()
        {
            var genres = _context.Genres.ToList();

            var modelView = new MovieFormModelView
            {
                DateAdded = DateTime.Now,
                Genres    = genres
            };

            return(View("MovieForm", modelView));
        }
        public ActionResult Edit(int id)
        {
            var movie  = _context.Movies.SingleOrDefault(c => c.Id == id);
            var genres = _context.Genres.ToList();

            if (movie == null)
            {
                return(HttpNotFound());
            }

            var modelView = new MovieFormModelView(movie)
            {
                Genres = _context.Genres.ToList()
            };

            return(View("MovieForm", modelView));
        }