class Menu implements Comparable<Menu>{

   String id;

   String name;

}

static constraints = {

    //

    id bindable : true

    name nullable:true

}

static mapping = {

    //

    id column:'MENU_ID' , generator:'assigned'

    name column:'MENU_NAME'

}

// 1
@Transactional

def test(){

     def m_lv1_i1 = new Menu(

                    name: 'home',

                    id: "m_lv1_i1"

            ).save flush: true

}