处理猪连接中的一对多关系

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

    private String name;

    // Getters and Setters
}

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

    private String name;

    @ManyToOne
    @JoinColumn(name = "pigsty_id")
    private Pigsty pigsty;

    // Getters and Setters
}

public interface PigstyRepository extends JpaRepository<Pigsty, Long> {
}

public interface PigRepository extends JpaRepository<Pig, Long> {
    List<Pig> findByPigstyId(Long pigstyId);
}

@Service
public class PigService {

    @Autowired
    private PigRepository pigRepository;

    public List<Pig> getPigsByPigstyId(Long pigstyId) {
        return pigRepository.findByPigstyId(pigstyId);
    }

    // 其他业务逻辑...
}

@RestController
@RequestMapping("/pigs")
public class PigController {

    @Autowired
    private PigService pigService;

    @GetMapping("/pigsty/{id}")
    public List<Pig> getPigsByPigstyId(@PathVariable Long id) {
        return pigService.getPigsByPigstyId(id);
    }

    // 其他API...
}