Question

我的第一个Spring Data Rest实验失败了。我已经采取了＃34;入门＆＃34;并修改了一下以创建两个具有多对一关系的实体。实体是Book和Shelve，很多书都可以共享一个货架。

Shelve实体如下所示：

package hello;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Shelve
{
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    private int length;

    public int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }
}

Book引用它：

package hello;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

@Entity
public class Book
{
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    private String title;

    @ManyToOne
    private Shelve shelve;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public Shelve getShelve() {
        return shelve;
    }

    public void setShelve(Shelve shelve) {
        this.shelve = shelve;
    }
}

完整项目可用here in GitHub。

现在我可以添加一个搁架：

curl -i -X POST -H "Content-Type:application/json" -d "{  \"length\" : \"30\" }" http://localhost:8080/shelves
HTTP/1.1 201
Location: http://localhost:8080/shelves/1
Content-Type: application/hal+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 17 Nov 2016 16:05:02 GMT

{
  "length" : 30,
  "_links" : {
    "self" : {
      "href" : "http://localhost:8080/shelves/1"
    },
    "shelve" : {
      "href" : "http://localhost:8080/shelves/1"
    }
  }
}

然后一本书：

curl -i -X POST -H "Content-Type:application/json" -d "{  \"title\" : \"The Battle of Life\" }" http://localhost:8080/books
HTTP/1.1 201
Location: http://localhost:8080/books/1
Content-Type: application/hal+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 17 Nov 2016 16:05:02 GMT

{
  "title" : "The Battle of Life",
  "_links" : {
    "self" : {
      "href" : "http://localhost:8080/books/1"
    },
    "book" : {
      "href" : "http://localhost:8080/books/1"
    },
    "shelve" : {
      "href" : "http://localhost:8080/books/1/shelve"
    }
  }
}

然后我试着把书放在货架上，但那失败了：

curl -i -X PUT -H "ContentType: text/uri-list" -d "http://localhost:8080/shelves/1" http://localhost:8080/books/1/shelve
HTTP/1.1 404
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 17 Nov 2016 16:05:02 GMT

{"timestamp":1479398702523,"status":404,"error":"Not Found","message":"No message available","path":"/books/1/shelve"}

知道这里出了什么问题吗？

Answer 1

正如Oliver Gierke在the related JIRA ticket所指出的，问题出在curl请求中。它应该在Content-Type中有一个大肆宣传：

curl -i -X PUT -H "Content-Type: text/uri-list" -d "http://localhost:8080/shelves/1" http://localhost:8080/books/1/shelve
HTTP/1.1 204
Date: Sat, 19 Nov 2016 16:50:24 GMT

所以一切都按预期工作，只要你以正确的方式使用它：）

@Oliver：非常感谢！

Answer 2

可能您需要在“货架”一侧指定链接，并尝试将该书添加到货架

//搁置模型

@OneToMany(mappedBy = "shelve")
public Set<Book> getBooks() {
    return books;
}

public void setBooks(Set<Book> books) {
    this.books = books;
}

// curl将书添加到搁置

curl -i -X PUT -H "ContentType: text/uri-list" -d "http://localhost:8080/books/1" http://localhost:8080/shelve/1/books

404关于设置关联资源

2 个答案: