Question

我按照本教程（https://spring.io/guides/tutorials/react-and-spring-data-rest/#react-and-spring-data-rest-part-5）来试验Spring Data REST，我想用TestRestTemplate测试CRUD。

添加（postForEntity）没问题。
删除（删除）没问题。
阅读（getForEntity）没问题。
更新（template.exchange（URL，HttpMethod.PUT，entity，String.class，ID））仅在我与其他实体没有任何关系时才有效......我不明白为什么。

以下是一个例子：

@Data
@Entity
public class Dojo {

    private @Id @GeneratedValue Long id;
    private String name;
    private String location;
    private Date created;
    @OneToMany(mappedBy = "dojo")
    @JsonIgnore
    private List<Workshop> workshops;

    private Dojo() {}

    public Dojo(String name, String location) {
        this.name = name;
        this.location = location;
        this.created = new Date();
        this.workshops = new ArrayList<>();
    }
//getters and setters ...
}

@Data
@Entity
public class Workshop {

    private @Id @GeneratedValue Long id;
    private String name;
    @ManyToOne
    private Dojo dojo;

    private Workshop() {}

    public Workshop(String name, Dojo dojo) {
        this.name = name;
        this.dojo = dojo;
    }
}

所以，我在Dojo和amp;之间有一个双向的1：n关系。作坊。 @JsonIgnore注释用于避免与JSON Marshaller的无限循环。存储库是标准的

 public interface WorkshopRepository extends CrudRepository<Workshop, Long> {}

现在我的测试：我想更新研讨会。听起来不错，不起作用。

@Test
public void testUpdateWorkshop() throws Exception {

    final String DOJO_NAME="My Dojo";
    final String DOJO_LOCATION="Liege";
    final String WORKSHOP_NAME="Stuff";
    final String HOST_PORT="http://localhost:8080";

     //creation of a dojo
    final Dojo DOJO = dojoRep.save(new Dojo(DOJO_NAME,DOJO_LOCATION));
     //creation of a workshop
    Workshop workshop = workshopRep.save(new Workshop(WORKSHOP_NAME,DOJO));

    String newValue = "After Test";

    System.out.println("before update");
    System.out.println(workshop.getName()+" == "+WORKSHOP_NAME);

    Long oldID = workshop.getId();

    //As you can see I didn't modify the workshop object
    HttpEntity<Workshop> entity = new HttpEntity<Workshop>(workshop);
    ResponseEntity<String> response = template.exchange(HOST_PORT+"/api/workshops/"+oldID, HttpMethod.PUT, entity, String.class, oldID);

    assert response.getStatusCodeValue() == 200;

    //re-Get the updated workshop
    workshop = workshopRep.findOne(oldID);

    System.out.println("after update");
    System.out.println(workshop.getName()+" == "+WORKSHOP_NAME);

    // as I didn't set the newValue, it must fail and workshop.getName() must stay equal to "Stuff".
    Assert.assertEquals("Update does not work",newValue,workshop.getName());
}

我运行mvn clean test和

before update
Stuff == Stuff

after update
My Dojo == Stuff

Failed tests: 
  WorkshopTests.testUpdateWorkshop:218 Update not work expected:<[After Test]> but was:<[My Dojo]>

所以基本上，我没有改变任何东西到我的对象但是

结果代码为200。
它改变了我的对象的属性。
修改了名称以获取dojo.name值！

只是......为什么？

更多信息：

当我使用新名称（使用newValue ;-)）和新的Dojo创建新的研讨会对象并尝试更新现有研讨会时，结果仍然相同。 workshop.dojo保持不变，名称从dojo.name复制。所以基本上，我的更新不起作用。

我也尝试使用mockMvc代替TestRestTemplate。

mockMvc.perform(put(HOST_PORT+"/api/workshops/"+oldID)
                .contentType(MediaType.APPLICATION_JSON_UTF8)
                .content(convertObjectToJsonBytes(workshop))
);

具有功能

private byte[] convertObjectToJsonBytes(Object object) throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    System.out.println("log my face ");
    System.out.println(mapper.writeValueAsString(object));
    return mapper.writeValueAsBytes(object);
}

在更新之前，日志似乎正确地解析了我的对象......

{"id":1,"name":"Stuff","dojo":{"id":1,"name":"My Dojo","location":"Liege","created":1500799092330}}

但仍然不起作用：（

当我运行应用程序（mvn spring-boot：run）时，在localhost上获取GET：8080 / api / workshops / 1返回

{
  "name" : "Stuff",
  "_links" : {
    "self" : {
      "href" : "http://localhost-core:8080/api/workshops/1"
    },
    "workshop" : {
      "href" : "http://localhost-core:8080/api/workshops/1"
    },
    "dojo" : {
      "href" : "http://localhost-core:8080/api/workshops/1/dojo"
    }
  }
}

如果我通过nameD更改了我的Dojo类的属性名称，并使用新名称和新的Dojo（先前保存到DB）进行更新，则更新名称，但不会更新道场。

总结一下我的问题是：

只是......为什么？
使用HTTP请求更新Workshop等对象的正确方法是什么？
测试此更新的正确方法是什么？

感谢所有人，祝你有个美好的一天！： - ）

Answer 1

我认为这是因为你正在使用bidirectional one-to-many关联。在这种情况下，您必须自己提供实体的链接/取消链接。例如，在集合设置器中，如下所示：

@Data
@ToString(exclude = "slaves")
@Entity
public class Master {

    @Id
    @GeneratedValue
    private Long id;

    private String name;

    @OneToMany(mappedBy = "master", cascade = {PERSIST, MERGE})
    private List<Slave> slaves;

    public void setSlaves(List<Slave> slaves) {

        // link new slaves to this master
        slaves.forEach(slave -> slave.setMaster(this)); 

        // unlink prev slaves
        if (this.slaves != null) this.slaves.forEach(slave -> slave.setMaster(null)); 

        this.slaves = slaves;
    }
}

@Data
@Entity
public class Slave {

    @Id
    @GeneratedValue
    private Long id;

    private String name;

    @ManyToOne
    private Master master;
}

然后您可以存储Slave：

POST http://localhost:8080/api/slaves
{
    "name": "slave1"
}

// the same for salve2, slave3, slave4

存储Master：

POST http://localhost:8080/api/masters
{
    "name": "master1", 
    "slaves": [
        "http://localhost:8080/api/slaves/1",
        "http://localhost:8080/api/slaves/2"
        ]
}

更新Master：

PUT http://localhost:8080/api/masters/1
{
    "name": "master1u", 
    "slaves": [
        "http://localhost:8080/api/slaves/3",
        "http://localhost:8080/api/slaves/4"
        ]
}

PUT http://localhost:8080/api/masters/2
{
    "name": "master2"
}

或更新Slave：

PUT http://localhost:8080/api/slaves/1
{
    "name": "slave1u", 
    "master": "http://localhost:8080/api/masters/2"
}

PUT http://localhost:8080/api/slaves/2
{
    "name": "slave2u", 
    "master": "http://localhost:8080/api/masters/2"
}

见工作example。

其他info

使用JPA关系映射进行Spring Data Rest测试：更新

1 个答案: