[英]How to fetch embeddedId object in GET call using Spring Data Rest
[英]How to use Spring Data REST and ConversionService using @EmbeddedId?
我有一个带有 Spring Data REST 的应用程序,它返回此 JSON:
{
"_embedded" : {
"persons" : [ {
"personDetail" : {
"name" : "Alex",
"surname" : "Red",
"id" : {
"group" : "A",
"subclass" : "1"
},
"_links" : {
"self" : {
"href" : "https ://localhost:8080/myApp/api/personDetails/A_1"
}
}
}
}]
}
}
当我转到网址时:
https://localhost:8080/myApp/api/personDetails/A_1
或到这个网址:
https://localhost:8080/myApp/api/persons/04ee99a5-1578-400a-84be-d1ca87cda752/personDetail
该应用程序返回此 JSON:
{
"name" : "Alex",
"surname" : "Red",
"_links" : {
"self" : {
"href" : "https ://localhost:8080/myApp/api/personDetails/A_1"
},
"personDetail" : {
"href" : "https ://localhost:8080/myApp/api/personDetails/A_1"
}
}
}
“id”字段似乎消失了。 哪里完成了? 我该怎么做才能获得正确的对象投影?
这是人类:
@Entity
@Table
public class Person {
@Id
@GeneratedValue(generator = "uuid")
@GenericGenerator(name = "uuid", strategy = "uuid2")
@Column(columnDefinition = "BINARY(16)", length = 16)
private UUID id;
@ManyToOne(fetch = FetchType.EAGER)
private PersonDetail personDetail;
public UUID getId() {
return id;
}
public void setId(UUID id) {
this.id = id;
}
public PersonDetail getPersonDetail() {
return personDetail;
}
public void setPersonDetail(PersonDetail personDetail) {
this.personDetail = personDetail;
}
}
这是 PersonDetail 类:
@Entity
@Table
public class PersonDetail {
@EmbeddedId
private PersonDetailId id;
@Column
private String name;
@Column
private String surname;
public PersonDetailId getId() {
return id;
}
public void setId(PersonDetailId id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
protected String[] getExcludeFieldNames() {
return null;
}
@Override
public String toString() {
return ReflectionToStringBuilder.toStringExclude(this, getExcludeFieldNames());
}
}
这是 PersonDetailId 类:
public class PersonDetailId implements Serializable {
@Column(name = "group", nullable = false)
private String group;
@Column(name = "subclass", nullable = false)
private String subclass;
public PersonDetailId() {
super();
}
public PersonDetailId(String group, String subclass) {
super();
this.group = group;
this.subclass = subclass;
}
public String getGroup() {
return group;
}
public void setGroup(String group) {
this.group = group;
}
public String getSubclass() {
return subclass;
}
public void setSubclass(String subclass) {
this.subclass = subclass;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append(group).append("_").append(subclass);
return builder.toString();
}
}
这是存储库 REST:
@RepositoryRestResource
public interface PersonDetailRepository extends JpaRepository<PersonDetail, PersonDetailId> {
@RestResource(exported=false)
PersonDetail findBySurname(String surname);
}
这是我使用的转换器:
@Component
public class PersonDetailIdConverter implements Converter<String, PersonDetailId> {
@Autowired
private PersonDetailRepository personDetailRepository;
@Override
public PersonDetailId convert(String source) {
PersonDetailId result = null;
List<PersonDetail> details = personDetailRepository.findAll();
for (PersonDetail detail:details) {
if (detail.getId().toString().equals(source)) {
result = detail.getId();
break;
}
}
return result;
}
}
这是注册该转换器的配置:
@Configuration
public class CustomizedRestMvcConfiguration extends RepositoryRestConfigurerAdapter {
@Bean
PersonDetailIdConverter personDetailIdConverter(){
return new PersonDetailIdConverter();
}
@Override
public void configureConversionService(ConfigurableConversionService conversionService) {
conversionService.addConverter(personDetailIdConverter());
super.configureConversionService(conversionService);
}
}
我使用转换器,因为它是使 url 工作的唯一方法:
"href" : "https://localhost:8080/myApp/api/personDetails/A_1"
有什么想法吗? 谢谢。
编辑
似乎这取决于预测。 当我使用我创建的投影转到对象的链接时,返回的 JSON 包含我需要的所有值。
从 spring 3.1 开始,这是如何注册转换器:
@Import(RepositoryRestMvcConfiguration.class)
public class CustomizedRestMvcConfiguration implements RepositoryRestConfigurer {
@Override
public void configureConversionService(ConfigurableConversionService conversionService) {
conversionService.addConverter(new PersonDetailIdConverter());
super.configureConversionService(conversionService);
}
}
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