protected override Expression <Func <DecoratorListAssociation, bool> > FindExisting(DecoratorListAssociation record)
 => existing
 => existing.DecoratorId == record.DecoratorId &&
 existing.DecoratorListId == record.DecoratorListId;
        protected override IEnumerable <object> EnumerateReferences(DecoratorListAssociation record)
        {
            yield return(record.Decorator);

            yield return(record.DecoratorList);
        }