I need to retrieve a Rating class object. Joincolums values cannot be retrieve. How do I fix this?-CodePudding

I am trying to retrieve a Ratings class object. But userId and answer_id are foreign keys. Therefore they are join Columns.

  @Query("SELECT r FROM Ratings r WHERE r.userId = ?1 AND r.answer_id = ?2")
    public Ratings searchObject(Long userId,Long answerId);

public class Ratings {
@ManyToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "userId")
    private User user;

    @ManyToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "answer_id")
    private Answer answer;
//GETTERS AND SETTETRS
}

This error has occurred. when I tried to retrieve ratings object:

Caused by: org.hibernate.QueryException: could not resolve property: userId of: com.smartedulanka.finalyearproject.datalayer.entity.Ratings

How do I fix this issue?

CodePudding user response：

You need to decide if you want to use a HQL (recommended) or a native query:

HQL:

@Query("FROM Ratings r WHERE r.user.id = ?1 AND r.answer.id = ?2")

SQL:

@Query(nativeQuery=true, value="SELECT r FROM Ratings r WHERE r.userId = ?1 AND r.answer_id = ?2")