resource link rel with id spring data rest

Question

拥有以下实体和存储库。我无法在我的关系上加上身份。预先感谢您的帮助

来自我的 build.gradle 的相关工件（使用 Spring 引导版本 1.5.4.RELEASE）

compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-data-rest')

实体

商店

@Entity
@Table(name = "store")
class Store {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    long id

    String description

    @ManyToOne(optional=false, fetch = FetchType.EAGER)
    Province province
}

省

@Entity
@Table(name = "province")
class Province {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    long id

    @NotNull
    String name
}

存储库

商店

@RepositoryRestResource(collectionResourceRel = "stores", path = "stores")
interface StoreRepository extends PagingAndSortingRepository<Store, Long> {
}

省

@RepositoryRestResource(collectionResourceRel = "provinces", path = "provinces")
interface ProvinceRepository extends PagingAndSortingRepository<Province, Long> {
}

预期结果 我期待这个结果，请注意link省

{
 "stores": [
  {
    "id": 1,
    "description": "desc1",
    "_links": {
      "self": {
        "href": "http://localhost:8080/stores/1"
      },
      "store": {
        "href": "http://localhost:8080/stores/1"
      },
      "province": {
        "href": "http://localhost:8080/stores/1/province/1" ==> Expecting the url with provinceID since its many to one
      }
    }
  }
 ]
  //Simplified for simplicity sake
}

实际结果 href

中没有省份 ID

{
 "stores": [
  {
    "id": 1,
    "description": "desc1",
    "_links": {
      "self": {
        "href": "http://localhost:8080/stores/1"
      },
      "store": {
        "href": "http://localhost:8080/stores/1"
      },
      "province": {
        "href": "http://localhost:8080/stores/1/province" ==> //NO ID!
      }
    }
  }
 ]
  //Simplified for simplicity sake
}

基本上我在期待

这个

"province": {
            "href": "http://localhost:8080/stores/1/province/1" ==> Expecting the url with provinceID since its many to one
          }

而不是这个

  "province": {
    "href": "http://localhost:8080/stores/1/province" //NO province ID
  }

编辑 6 月 21 日 11:54 由于尝试执行

时出错，我已将 Store 上的 FetchType.LAZY 更改为 EAGER

"http://localhost:8080/stores/1/province/1"

得到

"org.springframework.http.converter.HttpMessageNotWritableException",
  "message": "Could not write JSON: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer

Answer 1

最后我找到了两种可能的方法来解决这个问题，一个是 Projections，另一个是 ResourceProcessor。希望这对某人有所帮助。

Projections。

@Projection(name="storeProjection", types={Store.class})
interface StoreProjection {

    long getId();
    String getDescription();
    String getPhoneNumber();
    StoreStatus getStatus();

    @Value("#{target.province.id}")
    Long getProvinceId();

    @Value("#{target.province.name}")
    String getProvinceName();
}

GET http://localhost:8080/stores?projection=storeProjection

JSON 结果

{
  //Store data...

    "provinceId": "1"
    "provinceName": "Prov1"

 //Links,etc data
}

ResourceProcessor 以添加具有所需信息的新 link

@Configuration
class ResourcesProcessors {

    @Autowired
    EntityLinks entityLinks

    @Bean
    public ResourceProcessor<Resource<Store>> storeProcessor() {

        return new ResourceProcessor<Resource<Store>>() {
            @Override
            public Resource<Store> process(Resource<Store> resource) { //Este punto solo se agregan nuevos links

                Store store = resource.getContent()
                Link link = entityLinks.linkToSingleResource(Province.class, store.province.id);
                resource.add(link);
                return resource;
            }
        };
    }
}

resource link rel with id spring data rest

resource link rel with id spring data rest

spring

spring-data

spring-data-rest