public OrderSummary Checkout(User user)
{
int bookClubCount = user.BookClub != null?GetBookClubSelections(user.BookClub.Books) : 0;
return(new OrderSummary {
TotalPrice = BooksToPurchase.Sum(book => book.Price), BookClubSelectionsCount = bookClubCount
});
}
private int GetBookClubSelections(IEnumerable <Book> bookClubBooks)
{
return(BooksToPurchase.Sum(book => bookClubBooks.Count(bookClubBook => bookClubBook.IsSameEdition(book))));
}
public void AddBook(Book book)
{
BooksToPurchase.Add(book);
}
