public Loan CheckoutBook(long patronId, long bookId)
{
var patron = _patronStorage.GetById(patronId);
patron.CheckOutBook();
var book = _bookStorage.GetById(bookId);
book.CheckOut();
var loan = new Loan(patron, book);
_loanStorage.Create(loan);
return(loan);
}
public Loan CheckoutBook(Guid patronId, Guid bookId, Guid userId)
{
var patron = _patronStorage.GetById(patronId, userId);
patron.CheckOutBook();
_patronStorage.Update(patron);
var book = _bookStorage.GetById(bookId, userId);
book.CheckOut();
_bookStorage.Update(book);
var loan = new Loan(patron, book, userId);
_loanStorage.Create(loan);
return(loan);
}