You could add a custom validator to your main command object
@Validateable
class SurveyCommand {
SectionCommand useful
SectionCommand recommend
static subValidator = {val, obj ->
return val.validate() ?: 'not.valid'
}
static constraints = {
useful(validator: subValidator)
recommend(validator: subValidator)
}
SurveyCommand() {
useful = new SectionCommand(
question: 'Did you find this useful?',
isRequired: true)
recommend = new SectionCommand(
question: 'Would you recommend to someone else?',
isRequired: false)
}
}