protected override Expression <Func <ConstructorListAssociation, bool> > FindExisting(ConstructorListAssociation record)
 => existing
 => existing.ConstructorId == record.ConstructorId &&
 existing.ConstructorListId == record.ConstructorListId;
        protected override IEnumerable <object> EnumerateReferences(ConstructorListAssociation record)
        {
            yield return(record.Constructor);

            yield return(record.ConstructorList);
        }