resource link rel with id spring data rest - spring

Question

Having following Entities and Repositories. I could'nt manage to put the id on my relationship. Thanks in advance for your help
Related artifacts from my build.gradle (using Spring Boot version 1.5.4.RELEASE)
compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-data-rest')
Entities
Store
#Entity
#Table(name = "store")
class Store {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
long id
String description
#ManyToOne(optional=false, fetch = FetchType.EAGER)
Province province
}
Province
#Entity
#Table(name = "province")
class Province {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
long id
#NotNull
String name
}
Repositories
Store
#RepositoryRestResource(collectionResourceRel = "stores", path = "stores")
interface StoreRepository extends PagingAndSortingRepository<Store, Long> {
}
Province
#RepositoryRestResource(collectionResourceRel = "provinces", path = "provinces")
interface ProvinceRepository extends PagingAndSortingRepository<Province, Long> {
}
Expected Result
I'm expecting this result, please note link on Province
{
"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
}
Actual Result
Not having the Province Id in href
{
"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
}
Basically im expecting
this
"province": {
"href": "http://localhost:8080/stores/1/province/1" ==> Expecting the url with provinceID since its many to one
}
instead of this
"province": {
"href": "http://localhost:8080/stores/1/province" //NO province ID
}
Edit Jun 21 at 11:54
I've changed FetchType.LAZY to EAGER on Store due to an error when trying to do
"http://localhost:8080/stores/1/province/1"
GOT
"org.springframework.http.converter.HttpMessageNotWritableException",
"message": "Could not write JSON: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer

Answer 1

Finally i've found two possibles ways to solve this one with Projections and the other using ResourceProcessor. Hope this help somebody.
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 result
{
//Store data...
"provinceId": "1"
"provinceName": "Prov1"
//Links,etc data
}
ResourceProcessor in order to add a new link with desired info
#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;
}
};
}
}