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

You could probably use the reject mechanism, i.e.

domainObjects.errors.each{
     commandObject.errors.reject( ... )
}

http://grails.org/doc/1.3.7/ref/Domain%20Classes/errors.html