使用 spring-data-rest 将资源添加到集合

Question

我的情况： 我有一个可以有很多工人的组织。我试图在 SDR 项目的主要撰稿人 this example 之后向一个组织添加一个新工作人员，但我遇到了各种错误（包括 204，但没有任何反应）。

这是我的实体和休息电话：

@Entity
public class Organization {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;


    @OneToMany
    @JoinTable(name = "OrganizationWorker", joinColumns = {@JoinColumn(name = "OrganizationID")},
            inverseJoinColumns = {@JoinColumn(name = "WorkerID")})
    private Set<Worker> workers = new LinkedHashSet<>();
}

public class Worker {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Long id;

    @NotNull
    private String givenName;

    @NotNull
    private String familyName;

    @NotNull
    private LocalDate dob;

    @NotNull
    private String nationalId;

    private byte[] photo;
}

获取http://localhost:8080/hal

{
    "_links": {

        "workers": {
            "href": "http://localhost:8080/hal/workers{?page,size,sort}",
            "templated": true
        }
    }
}

发布http://localhost:8080/hal/workers

{
 "givenName": "James",
    "familyName": "Bond",
    "dob": "1970-01-01",
    "nationalId": "XXX-60-XXXX",
    "photo": null,
}

回复：

Location: http://localhost:8080/hal/workers/8
Date: Mon, 02 May 2016 16:53:02 GMT
Server: Apache-Coyote/1.1
Transfer-Encoding: chunked
X-Application-Context: application
Content-Type: application/hal+json;charset=UTF-8


{
    "givenName": "James",
    "familyName": "Bond",
    "dob": "1970-01-01",
    "nationalId": "XXX-60-XXXX",
    "photo": null,
    "_links": {
        "self": {
            "href": "http://localhost:8080/hal/workers/8"
        },
        "worker": {
            "href": "http://localhost:8080/hal/workers/8"
        }
    }
}

最后一步，根据描述中的链接：

curl -X PUT -H "ContentType: text/uri-list" http://localhost:8080/hal/organizations/2 -d 'http://localhost:8080/hal/workers/8'

{
    "cause": null,
    "message": "Target bean is not of type of the persistent entity!"
}

做一些调试很明显具体的抱怨是什么。堆栈跟踪指向这里：

@Override
public PersistentPropertyAccessor getPropertyAccessor(Object bean) {

    Assert.notNull(bean, "Target bean must not be null!");
    Assert.isTrue(getType().isInstance(bean), "Target bean is not of type of the persistent entity!");

    return new BeanWrapper<Object>(bean);
}

getType() -> 组织

isInstance(bean) -> org.springframework.hateoas.Resource 的 bean 实例

对此有何意见？我按照信中的指示进行了操作。

Answer 1

这就是答案（我需要出去散步才能理清头绪并击中这个）。

您必须发布到关联资源

http://localhost:8080/hal/organizations/1/工人

我突然想到了那个金块，然后我去重新阅读了这篇文章。

对于像我这样的愚蠢错误，400 错误会更有用。