How to use an order by clause with an embedded field in the spring data jpa derived query? - spring

Question

I have two entities : Article and Category
#AllArgsConstructor
#Entity
#ToString
#Table(name = "articles")
public class Article {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long id;
#Column(name = "title", nullable = false, unique = true)
private String title;
#Embedded
private Audit audit = new Audit();
#ManyToMany(fetch = FetchType.LAZY, cascade = {CascadeType.MERGE})
#JoinTable(name = "articles_categories", joinColumns = {#JoinColumn(name = "articles_id")}, inverseJoinColumns = {#JoinColumn(name = "categories_id")})
#JsonManagedReference
private List<Category> categories = new ArrayList<>();
Now the entity Category
Then I have Category entity
#Getter
#Setter
#Accessors ( chain = true )
#NoArgsConstructor
#AllArgsConstructor
#Entity
#Table ( name = "category" )
public class Category {
#Id
#GeneratedValue ( strategy = GenerationType.IDENTITY )
#Column ( name = "id" )
private Long id;
#Column ( name = "name", nullable = false, unique = true )
private String name;
#ManyToMany ( fetch = FetchType.LAZY, cascade = { CascadeType.PERSIST , CascadeType.MERGE }, mappedBy = "categories" )
#JsonBackReference
private Set<Article> categories = new HashSet<>();
}
And now the entity Embedded
#Getter
#Setter
#Embeddable
#RequiredArgsConstructor
public class Audit {
#Column ( name = "created_on" )
private Date createdOn;
#Column ( name = "updated_on" )
private Date updatedOn;
#PrePersist
public void prePersist ( ) {
createdOn = new Date ( );
}
#PreUpdate
public void preUpdate ( ) {
updatedOn = new Date ( );
}
}
In my article repository I have the following JPA.
#Repository
public interface ArticleRepository extends JpaRepository < Article, Long > {
Page<Article> findByCategoriesIn (List<Category> categories, Pageable pageable);
}
This works correctly and is returning a page of articles but I would like to order articles by creation date using #Embeeded annotation.
How could I use this ?

Answer 1

Try to use something like this:
Page<Article> findByCategoriesInOrderByAudit_CreatedOnDesc(List<Category> categories, Pageable pageable);
See also this and this sections of the documentation.