在 jpa hibernate 表上保存数据在连接列上给出 null

Question

I have two tables which are related to each other, table "user" and "address":

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

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    @NotNull
    @Column(unique = true)
    private String user_name;

    @Column
    private String description;

    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
    protected Set<Address> addresses= new HashSet<>();
}

While in the other table:

@Entity
@Table(name = "address")
@Data
public class Address{

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

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

    private String description;
}

I did a post request to create new user with some addresses:

@PostMapping ("/user/create")
public ResponseEntity post(@RequestBody User user) {
    userService.saveNewUser(user);
     // return
}

In a post request I sent this json:

{
 
  "user_name": "example",
  "description": "this is a  user description",
  "addresses": [
    {
      "description": "this is a address 1"
    },
    {
      "description": "this is a address 2"
    }
  ]
}

When I insert data I get the "address" table the "user_id" is null, the data are inserted but the relations are not there? What I'm doing wrong here? Please help!

Update: Let's say I have this method saveNewUser on the service, how to call update Address?

public Oject saveNewUser(User user ) {
       // 
        return jpaRepository.save(user);
    }

Answer 1

You have to support all relations manually. Hibernate doesn't do it for you. So you need to set a user for each address.

public Oject saveNewUser(User user ) {
   user.getAddresses().forEach(address -> address.setUser(user));
   return jpaRepository.save(user);
}