public async Task <IActionResult> Edit(int id, CreateOrUpdateViewModel category)
        {
            if (id != category.Id)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                category.Alias = category.Name.ToFriendlyUrl();

                category.UpdateDate = DateTime.Now;

                var viewModel = _mapper.Map <Category>(category);

                _context.Update(viewModel);

                Alert("Lưu danh mục thành công!");

                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }

            return(View(nameof(CreateOrUpdate), category));
        }
        public async Task <IActionResult> Edit(int id, CreateOrUpdateBookViewModel book, IFormFile fImage)
        {
            if (id != book.Id)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                if (string.IsNullOrEmpty(book.Image) && fImage.Length == 0)
                {
                    ModelState.AddModelError("", "Uploaded file is empty or null.");

                    DropdownForm(null);

                    return(View(nameof(CreateOrUpdate), book));
                }

                string image = UploadFileExtensions.UploadFile(fImage, "books");

                if (!string.IsNullOrEmpty(image))
                {
                    book.Image = image;
                }

                book.Alias = book.Title.ToFriendlyUrl();

                var viewModel = _mapper.Map <Book>(book);

                _context.Update(viewModel);

                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }

            DropdownForm(book);

            return(View(nameof(CreateOrUpdate), book));
        }
        public async Task <IActionResult> Edit(int id, CreateOrUpdateAuthorViewModel Author)
        {
            if (id != Author.Id)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                Author.Alias = Author.Name.ToFriendlyUrl();

                var viewModel = _mapper.Map <Author>(Author);

                _context.Update(viewModel);

                Alert("Lưu danh mục thành công!");

                await _context.SaveChangesAsync();


                return(RedirectToAction(nameof(Index)));
            }
            return(View(nameof(CreateOrUpdate), Author));
        }