private BookInventoryService CreateInventoryService()
        {
            var userID   = Guid.Parse(User.Identity.GetUserId());
            var services = new BookInventoryService(userID);

            return(services);
        }
        // GET: BookInventory
        public ActionResult Index()
        {
            BookInventoryService service = CreateBookInventoryService();
            var model = service.GetBooks();

            return(View(model));
        }