public IActionResult RocketStageAdd(RocketStageAddViewModel rocketStageAddViewModel)
        {
            if (!ModelState.IsValid)
            {
                return(View(rocketStageAddViewModel));
            }
            var rocketStage = new RocketStage()
            {
                RocketStageModel       = rocketStageAddViewModel.RocketStageModel,
                ImageUrl               = rocketStageAddViewModel.ImageUrl,
                Weight                 = rocketStageAddViewModel.Weight,
                EnginesModel           = rocketStageAddViewModel.EnginesModel,
                FuelTanksModel         = rocketStageAddViewModel.FuelTanksModel,
                RocketStageDescription = rocketStageAddViewModel.RocketStageDescription
            };

            _rocketStageRepository.Save(rocketStage);
            return(View(rocketStageAddViewModel));
        }
        public IActionResult RocketStageAdd()
        {
            var rocketStageAddViewModel = new RocketStageAddViewModel();

            return(View(rocketStageAddViewModel));
        }