public static string ImportCars(CarDealerContext context, string inputJson)
        {
            var carDtos = JsonConvert.DeserializeObject<CarDto[]>(inputJson);

            List<CarDto> validCarDtos = new List<CarDto>();
            HashSet<int> partIds = context.Parts.Select(x => x.Id).ToHashSet();

            var config = new MapperConfiguration(cfg =>
            {
                cfg.CreateMap<CarDto, Car>();
            });

            var mapper = config.CreateMapper();

            foreach (var car in carDtos)
            {
                bool isValid = false;

                foreach (var part in car.PartsId.Distinct())
                {
                    if (partIds.Contains(part))
                    {
                        isValid = true;
                    }
                    else
                    {
                        isValid = false;
                        break;
                    }
                }

                if (isValid)
                {

                    validCarDtos.Add(car);
                }
            }


            for (int i = 0; i < validCarDtos.Count; i++)
            {
                var carTemp = mapper.Map<Car>(validCarDtos[i]);

                foreach (var part in validCarDtos[i].PartsId.Distinct())
                {
                    carTemp.PartCars.Add(new PartCar() { CarId = i + 1, PartId = part });
                }

                context.Cars.AddRange(carTemp);
            }



            var result = validCarDtos.Count();
                context.SaveChanges();

            return $"Successfully imported {result}.";
        }