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[英]Exception using Spring Data JPA and QueryDsl via REST Controller
[英]Spring JPA via REST
在花了很多时间之后,我缺少了@ManyToOne和@OneToMany映射的明显内容。
我有两个要通过REST公开的类,一个Project类和一个Milestone类。 每个项目可以具有许多关联的里程碑。
@Entity
public class Project {
@Id
@Column(name="project_id")
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@OneToMany
private List<Milestone> milestones = new ArrayList<>();
private String name;
private String description;
// Getter and setters removed for brevity
}
@Entity
public class Milestone {
@Id
@Column(name="milestone_id")
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
private String name;
private String description;
@ManyToOne
@JoinColumn(name="project_id")
private Project project;
// Getter and setters removed for brevity
}
我的存储库类是:
public interface ProjectRepository extends JpaRepository<Project, Long> {
List<Project> findByName(@Param("name") String name);
}
public interface MilestoneRepository extends JpaRepository<Milestone, Long> {
List<Milestone> findByName(@Param("name") String name);
}
在发布到localhost:8080 / projects / 1 / milestones的项目上更新URI无效,但是我可以在没有任何链接的情况下创建新项目和里程碑。
我的目标是发布项目条目,然后随着时间的推移发布里程碑条目,这将更新Project类上相关里程碑的列表。
知道有什么问题吗?
更新:
使用Python的HTTPIE实用程序,我执行了以下操作来创建初始项目:
http post localhost:8080 / projects name =“ test” description =“ test”
然后,我执行以下操作以分配里程碑:
http post localhost:8080 / milestones name =“ test” description =“ test” project =“ http:// localhost:8080 / projects / 1”
返回的响应是:
HTTP/1.1 201
Content-Type: application/json
Location: http://localhost:8080/milestones/1
Transfer-Encoding: chunked
{
"_links": {
"milestone": {
"href": "http://localhost:8080/milestones/1"
},
"project": {
"href":"http://localhost:8080/milestones/1/project"
},
"self":{
"href":"http://localhost:8080/milestones/1"
}
},
"description":"test",
"name":"test"
}
在数据库中,PROJECT_ID列为空
您需要进行POST
http:// localhost:8080 / milestones
其中包括通过其资源URL链接到关联项目的链接:
{
"name": "milestone name",
"description": "milstone description",
"project": "http://localhost:8080/projects/1"
}
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