如何使用Spring Data REST和HATEOAS公开完整的树结构?

本文介绍了如何使用Spring Data REST和HATEOAS公开完整的树结构?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个JPA树结构

@Entity
public class Document {

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   private int id;
   private String text;

   @ManyToOne
   @JoinColumn(name = "parent")
   Document parent;

   @OneToMany(mappedBy = "parent", fetch = FetchType.EAGER)
   Set<Document> children;

   (getters and setters)

}

和投影

@Projection(name = "all", types = Document.class)
public interface AllDocumentsProjection {

    int getId();
    String getText();
    Set<Document> getChildren();

}

当我使用URL发出GET请求

When I make a GET request with url

localhost:8080/documents/1?projection = all

localhost:8080/documents/1?projection=all

我仅获得根文档的第一个子级.不是孩子的孩子.投影有可能吗?还是有其他方法?

I only get the first children of the root document. Not children of the children. Is this possible with projections? Or is there an other way?

推荐答案

@Projection(name = "all", types = Document.class)
public interface AllDocumentsProjection {

    int getId();
    String getText();
    Set<AllDocumentsProjection> getChildren();

}

这对我来说很完美.

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