Question

I have NH mapping

public class TblContentMap : ClassMap<TblContent> {

        public TblContentMap() {
            Table("tbl_content");
            DynamicUpdate();

            Id(x => x.Id).GeneratedBy.Identity().Column("id");
....
            Map(x => x.ArticleType).Column("article_type").Not.Nullable();

        }
    }

then in my controller its mapped as

public ActionResult Save(TblContent model)

But when i call flush it throw exception.
not-null property references a null or transient value SocialDB.NDbModel.TblContent.ArticleType

Question is why? as i understand dynamic update should track which property was changed and update only that values.

PS. I know that it works if firstly get then update model
var item = MvcApplication.CurrentSession.GetContentById(model.Id);
item.Content = model.Content.StripHtml(false);

Answer 1

Generally it works as in EF, to use dynamic update need to select item and update fields then push it to database so it will update only modified fields.