无法找到实体..当试图保存数据

• Z时代
• 2024-01-10
• 分类：问答

我收到这个异常，当我试图用消息保存主题： 嵌套异常是javax.persistence.EntityNotFoundException：无法找到带有id的mypackage.model.Message fb8d39ea-0094-410d-975A-ea4495781422无法找到实体..当试图保存数据

下面是该模型：

@Entity 
public class Topic { 
    @Id 
    private String id; 
    private String title; 
    private String projectName; 
    private String author; 
    @OneToMany(mappedBy = "topicId") 
    private Set<Message> messages; 
    public Topic() { 
     this.messages = new HashSet<>(); 
    } 
} 
@Entity 
public class Message { 
    @Id 
    private String id; 
    private String author; 
    private String content; 
    private String topicId; 
} 

控制器：

@RequestMapping(value = "/projects/{projectSubject}", method = RequestMethod.POST) 
    public String createTopic(Model model, @PathVariable("projectSubject") String subject, 
           @RequestParam("title") String title, 
           @RequestParam("message") String messageContent, 
           @RequestParam("author") String author, 
           @RequestParam("projectName") String projectName) { 
     Project project = projectService.findBySubject(projectName); 
     if(project != null){ 
      Topic topic = new Topic(); 
      topic.setId(UUID.randomUUID().toString()); 
      topic.setAuthor(author); 
      topic.setProjectName(projectName); 
      topic.setTitle(title); 
      Message initialPost = new Message(); 
      initialPost.setId(UUID.randomUUID().toString()); 
      initialPost.setContent(messageContent); 
      initialPost.setAuthor(author); 
      topic.getMessages().add(initialPost); 
      topicService.saveTopic(topic); 
     } 
     return "topicList"; 
    } 

服务：

public void saveTopic(Topic topic) { 
     topicRepository.save(topic); 
} 

存储库：

public interface TopicRepository extends JpaRepository<Topic,String> {} 

回答：

@OneToMany(mappedBy = "topicId", cascade = {CascadeType.ALL}) 
private Set<Message> messages; 

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