Spring Hateoas链接和JPA持久性

Question

@Entity
public class PolicyEvent extends ResourceSupport` 

是否有某种方法通过JPA持久化链接成员，或者我的方法本身是不正确的（Hateoas链接数据不应该持久化）。

谢谢。

Answer 1

我建议不要混合使用JPA实体和HATEOAS公开的资源。下面是我的典型设置：

数据对象：

@Entity
public class MyEntity {
    // entity may have data that
    // I may not want to expose
}

存储库：

public interface MyEntityRepository extends CrudRepository<MyEntity, Long> {
    // with my finders...
}

public class MyResource {
    // match methods from entity 
    // you want to expose
}

@Service
public class MyServiceImpl implements MyService {
    @Autowired
    private Mapper mapper; // use it to map entities to resources
    // i.e. mapper = new org.dozer.DozerBeanMapper();
    @Autowired
    private MyEntityRepository repository;

    @Override
    public MyResource getMyResource(Long id) {
        MyEntity entity = repository.findOne(id);
        return mapper.map(entity, MyResource.class);
    }
}

@Controller
@RequestMapping("/myresource")
@ExposesResourceFor(MyResource.class)
public class MyResourceController {
    @Autowired
    private MyResourceService service;
    @Autowired
    private EntityLinks entityLinks;

    @GetMapping(value = "/{id}")
    public HttpEntity<Resource<MyResource>> getMyResource(@PathVariable("id") Long id) {
        MyResource myResource = service.getMyResource(id);
        Resource<MyResource> resource = new Resource<>(MyResource.class);
        Link link = entityLinks.linkToSingleResource(MyResource.class, profileId);
        resource.add(link);
        return new ResponseEntity<>(resource, HttpStatus.OK);
    }
}