public async Task <List <ClassListDTO> > GetClassList(Guid blogId)
        {
            IEnumerable <BlogClass> classes = await _classDS.GetFilteredAsync(x => x.BlogId == blogId);

            ClassListDTO emptyDto = new ClassListDTO {
                Id = null
            };

            SetClassDtoChildren(emptyDto, classes.ToList());
            //classList.


            return(emptyDto.Children);
        }