Query DSL advance sorting with spring pageable

Question

) I have some problem with sorting and spring pageable when I use QueryDSL. I need quite advanced sorting, not just by the fields of the object stored in the database in the same table.

This is my model in approx:

@Getter
@Setter
@Entity
public class Book {

  @Id
  @GeneratedValue
  private long id;

  @OneToMany
  private Set<Category> cats = new HashSet<>()

  } 

 @Getter
 @Setter
 @Entity
  public class Category{
    private long id;
    private Name name;
  }

 public enum Name{
  WINTER,
  SUN,
  SUMMER
 }

Now, this what I want to do is sort (desc and asc) Book (I have many Books) by Category id only if Category has name SUN. And i want to pass Qsort as Sort interface to PageRequest sping class.

I have no idea how I can achieve it. I try many way but none of these are even close to resolve this problem (for example some subquery with invoke any() on collection and use Qsort class). I affraid I made a mistake using Query DSL rather than Criteria Api. Can someone direct me? I will be very grateful.

Best Regards