public async Task <IActionResult> GetBikesByCategory(long catId)
        {
            var bikes = await _bikeRepository.GetBikesByCategoryAsync(catId);

            if (bikes != null)
            {
                return(Ok(_mapper.Map <IEnumerable <Bike>, IEnumerable <BikeDTO> >(bikes)));
            }
            return(NotFound());
        }