Question

I have two objects.

@Entity
class Person extends Model {

    ...
    @OneToOne
    Category category;
}


@Entity 
class Category extends Model {
    ...
}

I need to get the 5 most used categories. How can I do that ?

Thanks,

EDIT : Solution

List<Object[]> c = Category.find(
    "SELECT p.categorie, count(p.id) FROM Person p " +
    "GROUP BY p.category ORDER BY count(p.category) DESC").fetch(2);

Answer 1

Your JPQL query would be something like this:

SELECT p.category, COUNT(p.category)
FROM Person p
GROUP BY p.category
ORDER BY count(p.category) DESC

And you’d do query.setMaxResults(5) also.