public InformationItemsMap()
        {
            this.Table("Information");

            this.Id(m => m.InformationId);

            this.Map(m => m.Name);
            
            this.HasMany(m => m.Files)
                .KeyColumn("InformationId")
                .Inverse()
                .Cascade.All();
        }

        public FilesMap()
        {
            this.Table("Files");

            this.Id(m => m.FileId);

            this.Map(m => m.FileName);
            this.Map(m => m.ContentType)
                .Not.Update();
            this.Map(m => m.ContentLength)
                .Not.Update();
            this.Map(m => m.Content)
                .Length(int.MaxValue)
                .LazyLoad()
                .Not.Update();

            this.Map(m => m.InformationId).ReadOnly();

            this.References(m => m.Information)
                .Column("InformationId")
                .Fetch.Join()
                .Cascade.None();
        }

        public override void Update(InformationItem item)
        {
            item.BuildStructure();

            var oldModel = this.Get(item.InformationId);

            foreach (var file in oldModel.Files.Where(f => !item.Files.Any(i => i.FileId == f.FileId)))
                session.Delete(file);

            session.Merge(item);
        }

        public override void Update(InformationItem item)
        {
            item.BuildStructure();

            session.Update(item);
        }