public async Task <IList <MediaEntity> > Query(MediaQueryModel model)
        {
            var paging = model.Paging();

            var query = Db.Find();

            var joinQuery = query.LeftJoin <AccountEntity>((x, y) => x.CreatedBy == y.Id);

            if (!paging.OrderBy.Any())
            {
                joinQuery.OrderByDescending((x, y) => x.Id);
            }
            joinQuery.Select((x, y) => new { x, Creator = y.Name });

            var result = await joinQuery.PaginationAsync(paging);

            model.TotalCount = paging.TotalCount;

            return(result);
        }