多对多映射对象多列保存方法？

Question

如何用额外的列保存多对多映射对象？专列为“审批”。对于多对多注释，我只调用了setUsersDocuments（users），它工作正常...我怎样才能使它工作与额外的列？

文件

@JsonIgnore
    @OneToMany(mappedBy = "document")
    private List<UsersDocuments> documentsForUsers;

用户类

@OneToMany(mappedBy = "user", orphanRemoval = true, cascade= CascadeType.ALL)
private List<UsersDocuments> usersDocuments;

主键

@Embeddable
public class UserDocumentsId implements Serializable {

    @Column(name="user_id")
    private long user;

    @Column(name="document_id")
    private long document;

多对多表

    @Entity
@Table(name="users_documents")
public class UsersDocuments {

    @EmbeddedId
    private UserDocumentsId id;

    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("user")
    @JoinColumn(name = "user_id")
    private User user;

    @ManyToOne(fetch = FetchType.LAZY)
    @MapsId("document")
    @JoinColumn(name = "document_id")
    private Document document;

    @Column(name="approval")
    private boolean approval;

正在保存单据

Document document = new Document(title, desc);
        document.setUploadDatetime(new Date());
        document.setUser(user.get());

        List<User> users = userService.getUsersByRoles(roles);

//        document.setDocumentsForUsers(users); THIS WAS WHEN USING ONLY MANY TO MANY ANNOTATION

        documentService.saveDocument(document);

编辑：unsuccessfull保存对象-Document.GetDocumentsForUsers（）.Add（userDocuments）null.

Optional<User> user = userService.getUserByEmail(createdBy);
        Document document = new Document(title, desc);
        document.setUploadDatetime(new Date());
        document.setUser(user.get());

        List<User> users = userService.getUsersByRoles(roles);

        for(User userx : users){
            UsersDocuments userDocuments = new UsersDocuments();
            UserDocumentsId id = new UserDocumentsId();

            // Construct the Id with user and document
            id.setUser(userx.getId());
            id.setDocument(document.getId());

            userDocuments.setId(id);
            userDocuments.setApproval(true);

            // This is very important for saving and cascading to work.
            document.getDocumentsForUsers().add(userDocuments);
        }

        documentService.saveDocument(document);

编辑：错误

null

Answer 1

1）在单据实体中，增加UserDocuments关系级联：

@OneToMany(mappedBy = "document", cascade= CascadeType.ALL)
private List<UsersDocuments> usersDocuments;

2）您需要以不同的方式设置您的实体：

Document document = new Document(title, desc);
document.setUploadDatetime(new Date());

List<User> users = userService.getUsersByRoles(roles);

for(Use user: users){
    UserDocuments userDocuments = new UserDocuments();
    UserDocumentsId id = new UserDocumentsId();

    // Construct the Id with user and document
    id.setUser(user);
    id.setDocument(document);

    userDocuments.setDocumentsId(id);
    userDocuments.setActivtity(true);

    // This is very important for saving and cascading to work.
    document.getUserDocuments().add(userDocuments);
}

documentService.saveDocument(document);