外键为空

Question

我试图通过jpa在电话簿和用户之间建立关系，当当前登录的用户创建联系人时，表电话簿中用户的外键仍然为空。我在这里检查了几个问题，但对我没有用。

电话簿

@Entity
@Table(name = "Phonebook")
public class Phonebook {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "phonebook_id")
private Long id;

@Column(name = "phone", length = 15, nullable = false)
private String phoneNumber;

@Column(name = "firstname", length = 50, nullable = false)
private String firstName;

@ManyToOne
@JoinColumn(name = "user_id")
private User user;

//getters and setters

用户

@Entity
@Table(name = "users")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "user_id")
    private Long id;

    @Column(name = "email")
    private String email;

    @Column(name = "password")
    @Length(min = 5, message = "*Your password must have at least 5 characters")
    @org.springframework.data.annotation.Transient
    private String password;

    @OneToMany(mappedBy = "user")
    private List<Phonebook> phonebooks;

//getters and setters

电话簿控制器

    @RequestMapping(value = {"/home/phonebook"}, method = RequestMethod.GET)
        public String showPage(Model model, @RequestParam(defaultValue = "0") int page){
            Authentication auth = SecurityContextHolder.getContext().getAuthentication();
            User user = userService.findUserByEmail(auth.getName());
            model.addAttribute("data",phonebookRepository.findAllByUserId(user.getId(),PageRequest.of(page,10)));
            model.addAttribute("currentPage",page);
            return "/home/phonebook";
        }

    @PostMapping("/home/phonebook/save")
        public String save (Phonebook p){
            phonebookRepository.save(p);

            return "redirect:/home/phonebook";
        }

电话簿存储库

@Repository("phonebookRepository")
public interface PhonebookRepository extends JpaRepository<Phonebook,Integer> {
    List<Phonebook> findAllByUserId(Long id, Pageable pageable);
}

Answer 1

你必须做什么首先创建一个用户对象并设置 id 然后持久化电话簿。

Answer 2

您必须将PhoneBook 与您的User 保持在一起。

User u = new User();
// Set properties for your User...
PhoneBook p = new PhoneBook();
// Set properties for your phonebook...
// Store phone book to user:
u.setPhoneBook(Collections.singletonList(p));
userRepository.save(p);