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 did the following for my project and found it to be more cleaner!

domain.errors.each {
  cmdObject.errors.reject(it.code, g.message(error: it))
}