Java 插入到api的列表字段，邮递员返回ok，heroku部署的api字段为空

我正在用spring jpa和angular构建一个api rest。此api有一个列表字段“tags”，可通过postman with POST方法正确发布：

但当我转到部署在heroku中的api时，标记字段为空：

{"id":3164,"name":"Iñaki","surname":"Williams","dni":"19238191G","address":"calle almanaque,Madrid","mail":"williams@iñaqui.com","phone":"9373482382","linkedln":"https://www.linkedin.com/

在/sara-b-54b93543/“，”状态“：”por validar“，”评级“：”67“，”可用性“：”tardes“，”标签“：[]}]

我的专家模型：

@Entity
@Table(name="experts")
public class Expert {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;
    private String surname;
    private String dni;
    private String address;
    private String mail;
    private String phone;
    private String linkedln;
    private String state;
    private String rating;
    private String availability;


    @ManyToMany(mappedBy="expert", cascade = CascadeType.ALL,fetch = FetchType.EAGER)
    private List<Tag> tags = new ArrayList<>();


    public Expert() {
    }

    public Expert(String name, String surname, String dni, String address, String mail, String phone, String linkedln, String state, String rating, List<Tag> tags, String availability) {
        this.name = name;
        this.surname = surname;
        this.dni = dni;
        this.address = address;
        this.mail = mail;
        this.phone = phone;
        this.linkedln = linkedln;
        this.state = state;
        this.rating = rating;
        this.tags = tags;
        this.availability = availability;
    }

---

知道为什么会发生这种情况吗？谢谢！！！

当您对实体执行@manytomy字段时，它会创建第三个表，在这两个表之间进行映射，我建议您执行以下操作：

• 创建一个名为

  Response

• 此类将具有与

  Expert

  相同的属性，但没有任何注释（它不是实体）

• 每次有一个

  Expert

  实例时，创建一个

  Response

  实例，该实例采用相同的值

• 在RestController上，让返回

  Expert

  类列表的方法返回

  Response

  列表，您将用

  Response

  实例填充该列表

   public class Response {
  
   private Long id;
   private String name;
   private String surname;
   private String dni;
   private String address;
   private String mail;
   private String phone;
   private String linkedln;
   private String state;
   private String rating;
   private String availability;
   private List<Tag> tags = new ArrayList<>()
   ...  
   }
  

  公共类响应{
  私人长id；
  私有字符串名称；
  私家姓；
  私有字符串dni；
  私有字符串地址；
  私人字符串邮件；
  私人电话；
  私有字符串链接；
  私有字符串状态；
  私人字符串评级；
  私有字符串可用性；
  私有列表标记=新的ArrayList（）
  ...  
  }
  

   @Override
    public Expert postExpert(Expert expert) {
         this.manager.persist(expert);
         return expert;
    }

 public class Response {

 private Long id;
 private String name;
 private String surname;
 private String dni;
 private String address;
 private String mail;
 private String phone;
 private String linkedln;
 private String state;
 private String rating;
 private String availability;
 private List<Tag> tags = new ArrayList<>()
 ...  
 }