Doctrine2 :one-to-many relation;

Question

i have 2 entity with one-to-many relation : Article & ArticleCategory

class Article {
/**
 * @var integer
 *
 * @ORM\Column(name="rate", type="integer",options={"default" : 0})
 */
 private $rate = 0;
 /**
 * @var \ArticleCategory
 *
 * @ORM\ManyToOne(targetEntity="ArticleCategory",inversedBy="articles")
 * @ORM\JoinColumn(name="article_category_id", referencedColumnName="id")
 */
 private $category;
 }


class ArticleCategory {
/**
 *
 * @var \Article 
 * @ORM\OneToMany(targetEntity="Article", mappedBy="category")
 */
protected $articles;
}

now i want to fetch categories which has much articles with top rates..

" i mean top N categories ordered by highest rated article in them (categories which has more articles with rate above the average rate)"

how can i do this?

Answer 1

finally i found this for my question, maybe it can be useful for others! :)

    $query = $em->createQuery('SELECT c, avg(a.rate) x
                               FROM YoutabsGeneralModelBundle:ArticleCategory c 
                               JOIN c.articles a 
                               GROUP BY c.id
                               ORDER BY x DESC');

i add ORDER BY because i wanted to set limit on this :

    $query->setMaxResults($limit);