public async Task <IActionResult> Exist(string name, int?id = null)
        {
            try
            {
                var ext = await _rolService.Exists(this.Usuario, name, id);

                return(Ok(new
                {
                    valid = !ext
                }));
            }
            catch (Exception e)
            {
                return(StatusCode(500, e.Message));
            }
        }