public async Task <IActionResult> Post([FromRoute] Guid activityId, [FromBody] CreateRatingModel model)
        {
            var(_, isFailure, value, error) = await _ratingsService.Add(activityId, model);

            if (isFailure)
            {
                return(BadRequest(error));
            }

            return(Created(value.Id.ToString(), null));
        }