Symfony2 - Need help on how to join ManyToMany relationship into a query

Question

I'm currently using a createQueryBuilder to join 2 entities (category and blog) that are One ToMany and ManyToOne.

I've recently added a tag entity to blog (ManyToMany/ManyToMany) and would like to join this in the same query.

How would I do this?

current query:

public function getBlogs($limit = null)
{
$qb = $this->createQueryBuilder('b')
        ->select('b, c')
        ->leftJoin('b.category', 'c')
        ->addOrderBy('b.created', 'DESC');

    return $qb->getQuery()
        ->getResult();
}

tag entity:

/**
 * @ORM\ManyToMany(targetEntity="Blog", mappedBy="tags")
 */
protected $blogs;

public function __construct()
{
    $this->blogs = new ArrayCollection();
}

blog entity:

/**
 * @ORM\ManyToOne(targetEntity="Category", inversedBy="blogs")
 * @ORM\JoinColumn(name="category_id", referencedColumnName="id")
 */
protected $category;

/**
 * @ORM\ManyToMany(targetEntity="Tag", inversedBy="blogs")
 * @ORM\JoinColumn(name="tag_id", referencedColumnName="id")
 */
protected $tags;

public function __construct()
{
    $this->tags = new ArrayCollection();
}

category entity:

/**
 * @ORM\OneToMany(targetEntity="Blog", mappedBy="category")
 */
protected $blogs;

public function __construct()
{
    $this->blogs = new ArrayCollection();
}

Answer 1

This should be pretty easy by doing the following:

public function getBlogs($limit = null)
{
    $qb = $this->createQueryBuilder('b')
        ->select('b, c, tag')
        ->leftJoin('b.category', 'c')
        ->leftJoin('b.tags', 'tag')
        ->addOrderBy('b.created', 'DESC')
    ;

    // ...
}