java - 如何在 Jhipster 生成的应用程序上从 AbstractAuditingEntity 扩展实体？

Question

我用命令 yo jhipster:entity MyEntity 生成了一个实体(我使用的是 generator-jhipster@2.19.0 )

和以下选项

{
    "relationships": [],
    "fields": [
        {
            "fieldId": 1,
            "fieldName": "title",
            "fieldType": "String"
        }
    ],
    "changelogDate": "20150826154353",
    "dto": "no",
    "pagination": "no"
}

我在 liquibase 变更日志文件中添加了可审核的列

<changeSet id="20150826154353" author="jhipster">
    <createSequence sequenceName="SEQ_MYENTITY" startValue="1000" incrementBy="1"/>
    <createTable tableName="MYENTITY">
        <column name="id" type="bigint" autoIncrement="${autoIncrement}" defaultValueComputed="SEQ_MYENTITY.NEXTVAL">
            <constraints primaryKey="true" nullable="false"/>
        </column>
        <column name="title" type="varchar(255)"/>

        <!--auditable columns-->
        <column name="created_by" type="varchar(50)">
            <constraints nullable="false"/>
        </column>
        <column name="created_date" type="timestamp" defaultValueDate="${now}">
            <constraints nullable="false"/>
        </column>
        <column name="last_modified_by" type="varchar(50)"/>
        <column name="last_modified_date" type="timestamp"/>
    </createTable>

</changeSet>

并修改 MyEntity 类以扩展 AbstractAuditingEntity

@Entity
@Table(name = "MYENTITY")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class MyEntity extends AbstractAuditingEntity implements Serializable {

然后运行mvn test 得到以下异常

[DEBUG] com.example.web.rest.MyEntityResource - REST request to update MyEntity : MyEntity{id=2, title='UPDATED_TEXT'}

javax.validation.ConstraintViolationException: Validation failed for classes [com.example.domain.MyEntity] during update time for groups [javax.validation.groups.Default, ]
List of constraint violations:[
    ConstraintViolationImpl{interpolatedMessage='may not be null', propertyPath=createdBy, rootBeanClass=class com.example.domain.MyEntity, messageTemplate='{javax.validation.constraints.NotNull.message}'}
]
    at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:160)
    at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreUpdate(BeanValidationEventListener.java:103)
    at org.hibernate.action.internal.EntityUpdateAction.preUpdate(EntityUpdateAction.java:257)
    at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:134)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:463)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:349)
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350)
    at org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:67)
    at org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1191)
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1257)
    at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
    at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:573)
    at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:449)
    at org.hibernate.jpa.criteria.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:67)
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:318)

这是失败的测试

@Test
    @Transactional
    public void updateMyEntity() throws Exception {
        // Initialize the database
        myEntityRepository.saveAndFlush(myEntity);

        int databaseSizeBeforeUpdate = myEntityRepository.findAll().size();

        // Update the myEntity
        myEntity.setTitle(UPDATED_TITLE);


        restMyEntityMockMvc.perform(put("/api/myEntitys")
                .contentType(TestUtil.APPLICATION_JSON_UTF8)
                .content(TestUtil.convertObjectToJsonBytes(myEntity)))
                .andExpect(status().isOk());

        // Validate the MyEntity in the database
        List<MyEntity> myEntitys = myEntityRepository.findAll();
        assertThat(myEntitys).hasSize(databaseSizeBeforeUpdate);
        MyEntity testMyEntity = myEntitys.get(myEntitys.size() - 1);
        assertThat(testMyEntity.getTitle()).isEqualTo(UPDATED_TITLE);
    }

抛出异常的那一行是

List<MyEntity> myEntitys = myEntityRepository.findAll();

我注意到 TestUtil.convertObjectToJsonBytes(myEntity) 方法正在返回不带可审计属性的 JSON 对象表示 - 这是预期的，因为 @JsonIgnore 注释 - 但我想 mockMVC.perform 更新操作不遵守在 createdBy 字段上设置的 updatable = false 属性

@CreatedBy
@NotNull
@Column(name = "created_by", nullable = false, length = 50, updatable = false)
@JsonIgnore
private String createdBy;

如何使实体可审计并通过测试？

Answer 1

问题是传输(序列化)的对象不包含可审核的属性(由于@JsonIgnore 注释)，这与@NotNull 注释相结合会产生ConstraintViolation。

1.- 一种解决方案是首先检索我们要更新的对象，然后仅更新您需要的字段。因此，在我们的示例中，我们需要修改更新方法在 MyEntityResource 类上如下:

/**
 * PUT  /myEntitys -> Updates an existing myEntity.
 */
@RequestMapping(value = "/myEntitys",
    method = RequestMethod.PUT,
    produces = MediaType.APPLICATION_JSON_VALUE)
@Timed
public ResponseEntity<MyEntity> update(@RequestBody MyEntity myEntityReceived) throws URISyntaxException {
    log.debug("REST request to update MyEntity : {}", myEntityReceived);
    if (myEntityReceived.getId() == null) {
        return create(myEntityReceived);
    }
    MyEntity myEntity = myEntityRepository.findOne(myEntityReceived.getId());
    myEntity.setTitle(myEntityReceived.getTitle());
    MyEntity result = myEntityRepository.save(myEntity);
    return ResponseEntity.ok()
            .headers(HeaderUtil.createEntityUpdateAlert("myEntity", myEntity.getId().toString()))
            .body(result);
}

2.- 另一种解决方案是通过删除 AbstractAuditingEntity 中所需值的 @JsonIgnore 注释 来包含可审计字段。

创建实体时会产生如下响应

{
"createdBy":"admin",
"createdDate":"2015-08-27T17:40:20Z",
"lastModifiedBy":"admin",
"lastModifiedDate":"2015-08-27T17:40:20Z",
"id":1,
"title":"New Entity"
}

因此，在更新实体时，请求将包含先前生成的值

{
"createdBy":"admin",
"createdDate":"2015-08-27T17:40:20Z",
"lastModifiedBy":"admin",
"lastModifiedDate":"2015-08-27T17:40:20Z",
"id":1,
"title":"New Entity Updated"
}

同样更新响应，但是更新了 lastModified 字段

{
"createdBy":"admin",
"createdDate":"2015-08-27T17:40:20Z",
"lastModifiedBy":"admin",
"lastModifiedDate":"2015-08-27T17:45:12Z",
"id":1,
"title":"New Entity Updated"
}

两种解决方案各有优缺点，因此请选择最适合您的解决方案。

此外，您应该查看此 issue在generator-jhipster上，虽然它只是标题为DTO实体，但不管你用不用都是一样的问题。