CODEWITHSUNDEEP
jpaspring-data-jpa
user2200551
user2200551

Reputation: 21

JPA unidirectional one to one

I have 2 JPAs. UserJPA and PostJPA. UserJPA has all the user details, like name, address, id. Post JPA has a user_id column. It's a foreign key to User table's id column

when i save the post, i don't want to update the user table, but when i fetch the post table, i want to get the user information

@Table(name = "post_tbl")
public class PostJPA {

@Column(name = "user_id")
private Integer userId;

@Column(name = "content")
@NotNull
private String content;

@OneToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "user_id", referencedColumnName = "id", insertable = false, updatable = false)
UserJPA user = new UserJPA();
}


@Entity(name = "user")
@Table(name = "user_tbl")
public class UserJPA {
@Column(name = "user_name")
    private String userName;

    @Column(name = "first_name")
    @NotNull
    private String firstName;

    @Column(name = "last_name")
    private String lastName;

    @Column(name = "email")
    @NotNull
    private String email;
} ```

Why is a save done on PostJPA trying to insert an entry on the User?

Upvotes: 0

Views: 36

Answers (1)

Antoniossss
Antoniossss

Reputation: 32517

Because you are assigning a new, not persisted user to it with

UserJPA user = new UserJPA();

You should assign existing user to the post before saving it

Upvotes: 1

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