class Client implements Bindable{

    static hasMany = [...]

    String cName

    String dName

    Date created

    static constraints = {
        cName unique:true, blank:false, maxSize:255
        dName unique:true, blank:false, maxSize:255
    }


    static mapping = {
        ....
    }

    String toString(){
        return cName
    }
}

trait Bindable {
    def bindFrom(source) {
        def thisz = this

        source.properties.each { key, value ->
            if (thisz.hasProperty(key) && !(key in ['class', 'metaClass'])){
                thisz[key] = value
            }
        }
    }
}

void "test cName cannot be blank"() {
    when:
    domain.cName = ""

    then:
    !domain.validate(['cName'])
}