public static bool ValidateBookLoanGuid(this ReturnBookCommand command) { return(AssertionsConcern.IsSatisfiedBy(AssertionsConcern.ValidateGuidFromString(command.LoanId, Messages.BookReturn_LoanGuidStringIsEmpty, Messages.BookReturn_LoanGuidIsEmpty, Messages.BookReturn_LoanGuidIsInvalid))); }
public static bool ValidateBookLoanExists(this ReturnBookCommand command, BookLoan bookLoan) { return(AssertionsConcern.IsSatisfiedBy(AssertionsConcern.IsNotNull(bookLoan, "Book loan not found"))); }