public async Task <IActionResult> Books(int id)
        {
            var publisher = await this.publisherService.GetByIdAsync(id);

            if (publisher == null)
            {
                this.TempData.AddErrorMessage(WebAdminConstants.PublisherNotFound);
                return(this.RedirectToAction(nameof(Index)));
            }
            var books = bookService.GetBooksByPublisherId(id);

            return(this.View(books));
        }