Question

我有一个简单的问题-但我认为“我站在地铁上”。我有一个带有JPA，Modelmapper，实体和DTO的spring boot rest api。但是映射不起作用。

实体：

@Getter
@Setter
@MappedSuperclass
public class AbstractEntity {
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private Long id;
}

@Getter
@Setter
@Entity(name = "contacts")
public class Contact extends AbstractEntity {
  @NotBlank
  private String firstName;
  @NotBlank
  private String lastName;
  @Valid
  @OneToMany(mappedBy = "contact", cascade = CascadeType.ALL, orphanRemoval = true)
  private List<PhoneNumber> phoneNumberList;
}

@Getter
@Setter
@Entity(name = "phone_numbers")
public class PhoneNumber extends AbstractEntity {
  @NotBlank
  private String label;
  @NotBlank
  private String number;
  @ManyToOne
  @JoinColumn(name = "contact_id", referencedColumnName = "id")
  @Setter(value = AccessLevel.NONE)
  private Contact contact;
}

DTO：

@Getter
@Setter
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class ContactDTO {
  private Long id;
  private String firstName;
  private String lastName;
  List<PhoneNumberDTO> phoneNumberDTOList = new ArrayList<>();
}

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class PhoneNumberDTO {
  private Long id;
  private String label;
  private String number;
}

我的ModelMapperConfig：

  @Bean
  public ModelMapper modelMapper() {
    ModelMapper modelMapper = new ModelMapper();
    modelMapper.getConfiguration()
        .setFieldMatchingEnabled(true)
        .setFieldAccessLevel(AccessLevel.PRIVATE);
    return modelMapper;
  }

回购：

public interface ContactRepository extends JpaRepository<Contact, Long{
}

服务（仅创建方法）：

  @Override
  public ContactDTO createOne(ContactDTO contactDTO) {
    Contact contact = modelMapper.map(contactDTO, Contact.class);
    contactRepository.save(contact);
    return contactDTO;
  }

这是使用多个电话号码保留联系人的正确方法吗？

如何创建一个简单的映射？

如果我要坚持下去，就会出现错误：

Column 'contact_id' cannot be null

为什么我的映射DTO列表为空？映射和保留子列表的最佳方法是什么？

0 个答案: