public override IDataViewModel ToViewModel()
        {
            var vm = new GeolocationViewModel()
            {
                adset_id       = adset_id,
                region_maps    = new List <GeolocationRegionMapViewModel>(),
                location_types = location_types
            };

            //if (region_maps != null)
            //{
            //    foreach (var item in region_maps)
            //    {
            //        vm.region_maps.Add((GeolocationRegionMapViewModel)item.ToViewModel());
            //    }
            //}
            return(vm);
        }