public static IStatusGeneric <DddBook> CreateBook(string title, string description, DateTime publishedOn,
string publisher, decimal price, string imageUrl, ICollection <DddAuthor> authors)
{
var status = new StatusGenericHandler <DddBook>();
if (string.IsNullOrWhiteSpace(title))
{
status.AddError("The book title cannot be empty.");
}
var book = new DddBook
{
Title = title,
Description = description,
PublishedOn = publishedOn,
Publisher = publisher,
ActualPrice = price,
OrgPrice = price,
ImageUrl = imageUrl,
_reviews = new HashSet <DddReview>() //We add an empty list on create. I allows reviews to be added when building test data
};
if (authors == null)
{
throw new ArgumentNullException(nameof(authors));
}
byte order = 0;
book._authorsLink = new HashSet <DddBookAuthor>(authors.Select(a => new DddBookAuthor(book, a, order++)));
if (!book._authorsLink.Any())
{
status.AddError("You must have at least one Author for a book.");
}
return(status.SetResult(book));
}
internal DddBookAuthor(DddBook dddBook, DddAuthor dddAuthor, byte order)
{
DddBook = dddBook;
DddAuthor = dddAuthor;
Order = order;
}