private static Type GetRowIdTypeFromAttribute(PropertyRoute route)
        {
            var settings = Schema.Current.Settings;
            var att      = settings.FieldAttribute <PrimaryKeyAttribute>(route) ??
                           (route.IsVirtualMList() ? settings.TypeAttribute <PrimaryKeyAttribute>(route.Type.ElementType()) : null) ??
                           settings.DefaultPrimaryKeyAttribute;

            return(att.Type);
        }