java - repository.update(parentEntity) 不会在事务上下文中立即生成子 ID

Question

我正在使用micronaut-data-hibernate-jpaJPA 关系来保存父实体和子实体，将多个子实体添加到父实体并使用 parentWorkflowRepository.update(parentWorkflowEntity)但它不会生成 ChildWorkflowStateEntity Id 并且它返回为 null 生成的子 Id。如何在 repository.update(parent) 之后立即获取 childId。

@Entity
@Table(name = "Parent_Workflow")
public class ParentWorkflowEntity{


    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "WFL_ID")
    private List<ChildWorkflowStateEntity> wflStates = new ArrayList<>();

}


@Entity
@Table(name = "CHILD_WORKFLOW_STATE")
public class ChildWorkflowStateEntity{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID")
    private Long id;
}

public interface ParentWorkflowRepository extends CrudRepository<ParentWorkflowEntity, Long> {}



long method(ParentWorkflowEntity parentWorkflowEntity, List<Object> list){

    for(Object o: list){
        ChildWorkflowStateEntity child = new ChildWorkflowStateEntity()
        parentWorkflowRepository.getWflStates().add(child);
    } 
     
    parentWorkflowRepository.update(parentWorkflowEntity);

    return parentWorkflowEntity.getWflStates().findFirst().getId();
}