Spring Data Rest - 存储库上的 PUT 在子引用上静默失败 [英] Spring Data Rest - PUT on repository silently fails on child references

问题描述

我使用 Spring Data Rest 和 Spring Boot 2.1.1.RELEASE.

I use Spring Data Rest with Spring Boot 2.1.1.RELEASE.

我有一个 User 类，它与 Skill 类具有 @ManyToMany 关系.

I have a class User with a @ManyToMany relationship to a class Skill.

• 当我使用 POST 创建一个具有他技能的用户时，一切正常.
• 当我做一个PUT来更新用户时，技能没有更新，没有产生错误.
• 但是当我制作PATCH而不是PUT时，技能会正确更新.

• When I make a POST to create a user with his skills, everything works finely.
• When I make a PUT to update a user, the skills are not updated, no error is produced.
• But when I make a PATCH instead of a PUT, the skills are correctly updated.

有人遇到过类似的问题吗?我发现了另一个(旧)问题，但没有解决方案(Spring Data Rest - PUT 不适用于关联的引用类型?)

Have anyone met a similar issue? I have found another (old) question about it, but there isn't solution (Spring Data Rest - PUT is not working for associated reference types?)

我可能在某处错过了一些东西......

I probably have missed something, somewhere...

(使用 Lombok 的代码)

(Code using Lombok)

@Entity
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
public class User {

@Id
@GeneratedValue
private Long id;

private String firstName;
private String lastName;

@ManyToMany
@JoinTable(name="user_skills")
private List<Skill> skills = new ArrayList<>();

}

@Entity
@Getter
@Setter
@NoArgsConstructor
@ToString
public class Skill {

@Id
@GeneratedValue
private Long id;

private String name;
}

我使用以下 JSON 内容制作了一个 PUT:

I make a PUT with the following JSON content:

{
  "id": 7,
  "firstName": "John",
  "lastName": "Doe",
  "skills": ["http://localhost:9001/skills/1", "http://localhost:9001/skills/2", "http://localhost:9001/skills/3"]
}

firstName 或 lastName 可以修改，但技能保持不变.

The firstName or lastName can be modified, but the skills remain unmodified.

如果我用相同的payload做一个PATCH，技能就被正确修改了.

If I do a PATCH with the same payload, the skills are correctly modified.

它应该与 PUT 一起工作，不是吗?

It should work with a PUT, doesn't it?

推荐答案

经过多方调查，看来这种行为是故意的:PUT 不更新资源链接，只更新主要属性.

After more investigations, it seems that this behaviour is by purpose: PUT does not update the resource links, only the main attributes.

Oliver Gierke 的答案在这里:https://jira.spring.io/browse/DATAREST-1001?focusedCommentId=135791&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-135791:

The answer from Oliver Gierke is here: https://jira.spring.io/browse/DATAREST-1001?focusedCommentId=135791&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-135791:

我对此进行了调查，我认为您期望事情以他们不工作的方式工作.PUT 请求不考虑与可链接资源的关联，即链接指向的相关资源.原因有两个:

I looked into this and I'd argue you're expecting things to work in a way they don't work. PUT requests don't consider associations to linkable resources, i.e. related resources that are pointed to by links. The reason for that is two-fold:

1. 如果我们考虑使用负载中关联字段的 URI 来更新这些关联，那么问题就出现了，如果未指定 URI，会发生什么情况.对于当前行为，链接关联根本不是有效负载的一部分，因为它们仅驻留在 _links 块中.在这种情况下，我们有两个选择:擦除未处理的关联，这打破了PUT what you GET"；方法.仅擦除使用 null 提供的那些会模糊您放置了资源的整个状态".
2. 出于 1. 中提到的所有原因，公开了可以直接操作的专用关联资源.

所以看起来如果你想同时改变资源和关联的状态，我想公开一个专用资源来做到这一点.

So it looks like that if you want to change both state of the resource plus associations at the same time, I guess exposing a dedicated resource to do that is the way to go.

其他帖子和链接:

• 无法使用项目资源上的 PUT 请求更新关联资源":https://jira.spring.io/browse/DATAREST-1001
• Spring Data Rest PUT v.s PATCH LinkableResources": Spring Data Rest PUT vs PATCH LinkableResources
• PUT 的行为类似于嵌套集合的 PATCH":https://jira.spring.io/browse/DATAREST-1012

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