How do I map an nested JSON in a RestController? - json

Question

I am trying to save nested JSON in a database using Spring Boot and RestController. Those JSONs look something like this:
{
"name": "Car 1",
"plate_number": "PLATE NUMBER",
"owner": {
"first_name": "First name",
"last_name": "Last name"
}
}
It was easy to map the normal fields (name and plate number) using the auto mapping provided by spring in the RestController:
public Car createProduct(Car car) {
}
But now, how can i map the object owner to it's own class, CarOwner?( I need to mention that i have multiple classes that uses this approach so a generalised way would be very useful )
EDIT:
My entities look like this:
#Entity
#Table(name = "cars")
public class Car extends BaseEntityWithName {
private String name;
private String plateNumber;
#ManyToOne(fetch = FetchType.EAGER)
#JoinColumn(name = "owner_id")
private Owner owner;
}
#Entity
#Table(name = "car_owners")
public class CarOwner extends BaseEntityWithName {
private String firstName;
private String lastName;
// Constructor, setters, getters
}
And I'm trying to do something like this in the controller:
#RestController
#RequestMapping("/cars")
public class CarController {
#Autowired
private CarService carService;
#RequestMapping(value = "/create", method = RequestMethod.POST)
#ResponseBody
public ProductModel createItem(Car car) {
// How do I create the owner using the JSON parameters
// provided in the nested JSON?
car.setOwner(owner); // Owner created above
return carService.save(car);
}
}
EDIT 2
My two services look like this. The structure is the same on both of them.
#Service
public class CarServiceImpl implements CarService {
#Autowired
private ProductManufacturerRepository productManufacturerRepository;
#Autowired
private CarRepository carRepository;
#Override
public List<Car> findAll() {
return carRepository.findAll();
}
#Override
public Car findOne(Long id) {
return carRepository.findOne(id);
}
#Override
#Transactional
public Car save(Car car) {
return carRepository.save(car);
}
#Override
public void removeOne(Long id) {
carRepository.delete(id);
}
}

Answer 1

From your service layer I can see that you just need to save the owner class. Preferrably this would be in a separate Owner service but this is good enough for a start.
#Service
public class CarServiceImpl implements CarService {
#Autowired
private ProductManufacturerRepository productManufacturerRepository;
#Autowired
private CarRepository carRepository;
#Override
public List<Car> findAll() {
return carRepository.findAll();
}
#Override
public Car findOne(Long id) {
return carRepository.findOne(id);
}
#Override
#Transactional
public Car save(Car car) {
Owner person = car.getOwner();
ownerRepository.save(person);
return carRepository.save(car);
}
#Override
public void removeOne(Long id) {
carRepository.delete(id);
}
}