public override IEnumerable<TemplateViewModel> PartFieldEditorUpdate(ContentPartFieldDefinitionBuilder builder, IUpdateModel updateModel) {
            if (builder.FieldType != "MediaGalleryField") {
                yield break;
            }

            var model = new MediaGalleryFieldSettings();
            if (updateModel.TryUpdateModel(model, "MediaGalleryFieldSettings", null, null)) {
                builder.WithSetting("MediaGalleryFieldSettings.Hint", model.Hint);
                builder.WithSetting("MediaGalleryFieldSettings.AllowedExtensions", model.AllowedExtensions);
                builder.WithSetting("MediaGalleryFieldSettings.Required", model.Required.ToString(CultureInfo.InvariantCulture));
                builder.WithSetting("MediaGalleryFieldSettings.Multiple", model.Multiple.ToString(CultureInfo.InvariantCulture));
            }

            yield return DefinitionTemplate(model);
        }
        public override IEnumerable <TemplateViewModel> PartFieldEditorUpdate(ContentPartFieldDefinitionBuilder builder, IUpdateModel updateModel)
        {
            if (builder.FieldType != "MediaGalleryField")
            {
                yield break;
            }

            var model = new MediaGalleryFieldSettings();

            if (updateModel.TryUpdateModel(model, "MediaGalleryFieldSettings", null, null))
            {
                builder.WithSetting("MediaGalleryFieldSettings.Hint", model.Hint);
                builder.WithSetting("MediaGalleryFieldSettings.AllowedExtensions", model.AllowedExtensions);
                builder.WithSetting("MediaGalleryFieldSettings.Required", model.Required.ToString(CultureInfo.InvariantCulture));
                builder.WithSetting("MediaGalleryFieldSettings.Multiple", model.Multiple.ToString(CultureInfo.InvariantCulture));
            }

            yield return(DefinitionTemplate(model));
        }