Whole object validation with Grails

There is nice field validation framework in Grails (based on Spring) with a lot of documentation.
However recently I needed to implement whole object validation (I have some rules across different fields). It is easily supported by Grails, but is not that well documented. All you need to do is to is to implement method beforeValidate in your domain object, like:

def beforeValidate() {
  if (somethingbad()) {
    errors.addError("fieldname", "something bad happened")
  }
}

All errors that you have you should put into errors object, which is instance of
org.springframework.validation.BeanPropertyBindingResult and you can add errors as org.springframework.validation.ObjectError instances.