Wisdom query using Spring JpaRepository - spring-data-jpa

Question

Suggest, I have next structure of objects:
class MovieWrapper {
private Movie movie;
}
class Movie {
private User user;
#Enumerated(EnumType.STRING)
private Status status;
}
and I want to query from repository only first occurrence of MovieWrapper by User Id and where status is Active or Pending:
#Repository
public interface MovieWrapperRepository extends JpaRepository<MovieWrapper, Long> {
MovieWrapper findFirstByMovieUserIdAndMovieStatusActiveOrMovieStatusPending(Long userId);
}
How to do it in correct way?

Answer 1

To get 'custom' object from the repo method you should use projections (interface-base projection is preferable IMO).
To implement complex method you can build its query yourself, for example:
public interface MovieRepo extends JpaRepository<Movie, Long> {
Query("select m as movie from Movie m where m.user.id = ?1 and (m.status = 'ACTIVE' or m.status = 'PENDING')")
List<MovieProjection> findActiveOrPending(Long userId, Status status);
}
Where MovieProjection is a simple interface:
public interface MovieProjection {
Movie getMovie();
}
Note to the alias m as movie in the query, it's recommended to use with projections to avoid some errors.
UPDATED
If you need only one records you can use a trick with Pageable:
public interface MovieRepo extends JpaRepository<Movie, Long> {
Query("select m as movie from Movie m where m.user.id = ?1 and (m.status = 'ACTIVE' or m.status = 'PENDING')")
List<MovieProjection> findAllActiveOrPending(Long userId, Status status, Pageable pageable);
default Optional<MovieProjection> getFirstOne(Long userId, Status status) {
return findAllActiveOrPending(userId, status, PageRequest.of(0, 1)).stream().findAny();
}
}
Here we take first page with one record (PageRequest.of(0, 1) - see here)