春数据休息多对多树投影映射

Question

我有一个名为的contentPath，有可能有同样类型的父实体，以及同类型的儿子，有类似表示：

@Id 
    @Column(name = "ID") 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private Long id; 

    @Column(name = "NAME", length = 50) 
    @NotNull 
    private String name; 

    @Column(name = "DESCRIPTION") 
    private String description; 

    @ManyToOne 
    @JoinColumn(name="CONTENT_PATH_ID") 
    public ContentPath contentPath; 

    @OneToMany(mappedBy="contentPath") 
    public Set<ContentPath> contentPaths; 

    @ManyToMany(fetch = FetchType.EAGER) 
    @JoinTable(
      name = "ACTIVITY_CONTENT_PATH", 
      joinColumns = {@JoinColumn(name = "CONTENT_PATH_ID", referencedColumnName = "ID")}, 
      inverseJoinColumns = {@JoinColumn(name = "ACTIVITY_ID", referencedColumnName = "ID")}) 
    private Set<Activity> activities; 

我有我的ContentPathRepository将它公开为一个API。

@RepositoryRestResource(collectionResourceRel = "contentPaths", path = "contentPaths", excerptProjection = ContentPathProjection.class) 
public interface ContentPathRestRepository extends PagingAndSortingRepository<ContentPath, Long> { 

} 

和我的投影，它应该正确格式化我的对象。

@Projection(name = "contentPathProjection", types = ContentPath.class) 
public interface ContentPathProjection { 
    Long getId(); 
    String getName(); 
    Set<ContentPath> getContentPaths(); 
} 

我期待得到ContentPaths，其中有内部的ContentPaths的名单，我得到了成功，但它并不带来的ID，它只是把名称和描述，这是很奇怪，因为我的投影没有说明。

电流响应：

"name": "BOOK 1", 
"id": 1, 
"contentPaths": [ 
    { 
     "name": "UNIT 1", 
     "description": "UNIT 1 description" 
    }, 
    { 
     "name": "UNIT 2", 
     "description": "UNIT 2 description" 
    } 
] 

为什么会发生？如何解决它？

Answer 1

这是SDR的正常行为。它默认不显示id。要打开这个上只登记这样一个bean：

@Bean 
public RepositoryRestConfigurerAdapter repositoryRestConfigurerAdapter() { 
    return new RepositoryRestConfigurerAdapter() { 
     @Override 
     public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) { 
      config.exposeIdsFor(ContentPath.class); 
      super.configureRepositoryRestConfiguration(config); 
     } 
    }; 
} 

关于description - 你有这样的领域：

@Column(name = "DESCRIPTION") 
private String description;