public async Task <IActionResult> GetAll()
        {
            int userId;

            try
            {
                userId = IdentityHelper.GetUserId(User);
            }
            catch (UnauthorizedAccessException)
            {
                return(Unauthorized());
            }

            IEnumerable <ListDto> lists = await _listService.GetAllAsync(userId);

            return(Ok(lists));
        }