Spring : create object with id from another table

user_10358410 0
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I created objects User and Message, and now I want, that message's id will be associated with the user id. How can I do it with annotations or with something else? Table User Table Messge

Message class

@Entity
public class Message {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)

    private Long id;

    private String text;
    private String tag;

}

User class

@Entity
@Table(name = "usr")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String username;
    private String password;
    private boolean active;

    @ElementCollection(targetClass = Role.class  , fetch = FetchType.LAZY)
    @CollectionTable(name = "user_role" , joinColumns = @JoinColumn(name = "user_id"))
    @Enumerated(EnumType.STRING)
    private Set<Role> roles;
}
spring-mvc spring java
1 Answers

you can try this:

Message class: 

@Entity
public class Message {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)

    private Long id;

    private String text;
    private String tag;


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

}

user class:

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

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String username;
    private String password;
    private boolean active;

    @ElementCollection(targetClass = Role.class  , fetch = FetchType.LAZY)
    @CollectionTable(name = "user_role" , joinColumns = @JoinColumn(name = "user_id"))
    @Enumerated(EnumType.STRING)
    private Set<Role> roles;


    @OneToMany(mappedBy = "user")
    @JsonBackReference
    private set<Message> messages;
}
user_75248560
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