Doctrine 2 Restricting Associations with DQL

Question

There seems to be an over sight in Doctrine 2.1 where it isn\'t easy to return a subset collection for an association.

http://www.doctrine-project.org/docs/orm/2.1/

Answer 1

1. Having entitymanager in an entity isn't a good thing in any case (inject your repository instead)
2. Category isn't the only root for articles because it can't daterimne what articles you need, so you need a repository for articles.

What i would do:

class Category
{
    protected $id;
    protected $articles; // PesistentCollection

    public function getVisableArticles(IArticleRepository $articleRepository)
    {
        return $articleRepository->getVisibleByCategory($this);
    }
}

interface IArticleRepository
{
    function getVisibleByCategory(Category $category);
}

Your doctrine's repository would implement IArticleRepository and the class won't know anything about your data storage/doctrine.