public IActionResult Add(Rating rating, string author, string name)
{
var identityUser = userManager.GetUserAsync(User).GetAwaiter().GetResult();
Book book = bookService.Get(author, name);
rating.Book = book;
rating.AddedDate = DateTime.Now;
var user = userService.GetByIdentityUserId(identityUser.Id);
ratingService.Add(rating);
rankingService.AddByBook(rating);
userService.AddRating(user, rating);
return(RedirectToAction("Ratings"));
}