Grails: How to combine domain objects' errors with command objects' errors?

Question

Suppose I have User domain class and RegistrationCommand class. So when user is registering on website there are two steps for data validation:

1. RegistrationCommand

Answer 1

I think the full answer is:

if (!user.validate() || !user.save(true))
{
    if (user.errors.hasErrors())
    {
        user.errors.allErrors.each {FieldError error ->
            final String field = error.field?.replace('profile.', '')
            final String code = "registrationCommand.$field.$error.code"
            command.errors.rejectValue(field, code)
        }
    }
    chain(action: 'registration', model: [command: command])
    return
}