public int CheckoutBooks(IEnumerable <int> ids)
{
var books = GetBooksFromDb.Where(b => ids.Any(i => i == b.Id));
if (books.Any(b => b.Quantity == 0))
{
throw new ChangeConflictException();
}
foreach (var book in books)
{
book.Quantity = --book.Quantity;
book.Popularity = ++book.Popularity;
}
var order = new Order
{
Books = books.ToList(),
Credentials = HttpContext.Current.User.Identity.GetUserName(),
Time = DateTime.UtcNow
};
order = _db.Orders.Add(order);
_db.SaveChanges();
return(order.Id);
}
public IEnumerable <Book> SearchBooks(string query) => GetBooksFromDb .Where(b => b.FullTitle.Contains(query)) .OrderBy(b => b.Popularity) .ThenBy(b => b.Title) .ToList();
public Book GetBook(int id) => GetBooksFromDb .FirstOrDefault(b => b.Id == id);
public IEnumerable <Book> GetBooksByGenre(int id) => GetBooksFromDb .Where(b => b.Genres.Any(g => g.Id == id)) .OrderBy(b => b.Popularity) .ThenBy(b => b.Title) .ToList();
