public IActionResult GetMachines(int factoryId)
        {
            if (!_factoryRepository.FactoryExists(factoryId))
            {
                return(NotFound());
            }

            var machinesInFactoryFromRepo = _factoryRepository.GetMachines(factoryId);
            var machineInFactory          = Mapper.Map <IEnumerable <MachineDto> >(machinesInFactoryFromRepo);

            return(Ok(machineInFactory));
        }