通过Spring Boot API在REST调用中的POSTing oneToMany

@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
    private List<Order> orders = new ArrayList<>();

    // Getters and Setters
}

@Entity
public class Order {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String orderNumber;

    @ManyToOne
    @JoinColumn(name = "user_id")
    private User user;

    // Getters and Setters
}

@RestController
@RequestMapping("/api/users")
public class UserController {

    @Autowired
    private UserRepository userRepository;

    @PostMapping
    public ResponseEntity<User> createUser(@RequestBody User user) {
        User savedUser = userRepository.save(user);
        return new ResponseEntity<>(savedUser, HttpStatus.CREATED);
    }
}

{
    "name": "John Doe",
    "orders": [
        {
            "orderNumber": "ORD123"
        },
        {
            "orderNumber": "ORD456"
        }
    ]
}

@OneToMany(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Order> orders = new ArrayList<>();

@ManyToOne
@JoinColumn(name = "user_id")
private User user;

{
    "name": "John Doe",
    "orders": [
        {
            "orderNumber": "ORD123"
        },
        {
            "orderNumber": "ORD456"
        }
    ]
}