TransientPropertyValueException：对象引用未保存的瞬态实例-在刷新之前保存瞬态实例：

Question

@Entity
@Table(name="tbl_name")
public class Test extends BaseEntity {

    @OneToOne( fetch = FetchType.LAZY)
    @JoinColumn(name = "ALL_ORG_MST_SECTION_ID",nullable = true)
    private AllOrgMst allOrgMstSection;

    @OneToOne(fetch = FetchType.LAZY )
    @JoinColumn(name = "ALL_ORG_MST_SUB_SECTION_ID",nullable = true)
    private AllOrgMst allOrgMstSubSection;


    
}

{
   "allOrgMstSection": {
        "id": 23
    },
    "allOrgMstSubSection": {
        "id": null
    }
}

  @Autowired
    private TestRepository testRepository;

    @Override
    public Test save2(Test entity) {
        return testRepository.save(entity);
    }

在baseEntity中具有Id

Answer 1

从您提供的日志和模型中可以清楚地看出，您试图保存一个非托管对象，该对象具有ID。

解决方案是在保存之前，先对瞬态对象进行管理（这些对象已经在数据库中）。

这里

"allOrgMstSection": {
        "id": 23
    },

java prettyprint-override">public Test save(Test test) {
    if(test.getAllOrgMstSection() != null && test.getAllOrgMstSection().getId() != null) {
        Long id = test.getAllOrgMstSection().getId();        
        test.setAllOrgMstSection(allOrgMstSectionRepository.getOne(id));
    }

    if(test.getAllOrgMstSubSection() != null && test.getAllOrgMstSubSection().getId() != null ) {
        Long id = test.getAllOrgMstSubSection().getId();
        test.setAllOrgMstSubSection(allOrgMstSubSectionRepository.getOne(id));
    }
    return testRepository.save(test);
}

if(test.getAllOrgMstSection() != null && test.getAllOrgMstSection().getId() != null) {
     AllOrgMstSection updatedAllOrgMsgSection = test.getAllOrgMstSection();

     Long id = test.getAllOrgMstSection().getId();
     AllOrgMstSection existingAllOrgMstSection = allOrgMstSectionRepository.findById(id);
     
     BeanUtils.copyProperties(updatedAllOrgMsgSection, existingAllOrgMstSection /*pass property names you don't want to update*/);
     test.setAllOrgMstSection(existingAllOrgMstSection);
}