public Result <User> FinishBorrowOf(BookId bookId)
{
if (IsBorrowingABook && _maybeBorrowedBook.Value == bookId)
{
ApplyChange(new UserFinishedBookBorrow(Id, _fullName, bookId));
return(Ok(this));
}
return(Fail <User>($"User {Id} is not borrowing a book {bookId}"));
}
public Result <User> BorrowBook(BookId bookToLendId)
{
if (IsBorrowingABook)
{
return(Fail <User>($"User {Id} has already borrowed book '{_maybeBorrowedBook.Value}'."));
}
ApplyChange(new UserBorrowedBook(Id, _fullName, bookToLendId));
return(Ok(this));
}
public static Book NewBookFrom(
BookId id,
BookName bookName,
YearOfPrint yearOfPrint) =>
(Book) new Book().ApplyChange(new BookAdded(id, bookName, yearOfPrint));
public static BookId ToBookId(this string bookIdString) => BookId.BookIdFrom(bookIdString);