Adjusts in CompositeDomainClass to make it work

CompositeDomainClass.groovy

class CompositeDomainClass implements Serializable {
  //this is part of the pk
  MyOtherDomainClass otherDomainClass
  //other fields here...
  //and we try to map this
  static mapping {
    table 'composite_table'
    //id composite: ['id','otherDomainClass'], column: 'my_code_field'
    id composite: ['id','otherDomainClass']
    columns {
      otherDomainClass(column: 'other_table_id')
      id(column: 'my_code_field')
    }
    
  }
}