public CreatePersonValidator(IProcessQueries queryProcessor)
{
CascadeMode = CascadeMode.StopOnFirstFailure;
RuleFor(p => p.DisplayName)
// display name cannot be empty
.NotEmpty()
.WithMessage(ValidatePerson.FailedBecauseDisplayNameWasEmpty)
;
RuleFor(p => p.UserName)
// if username is present, validate that it is not attached to another person
.Must(p => ValidateUser.NameMatchesNoEntity(p, queryProcessor))
.WithMessage(ValidateUser.FailedBecauseNameMatchedEntity,
p => p.UserName)
;
}