Count of Tags for Post in doctrine2 orm

Post.php

<?php

namespace Anyt\BlogBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;

/**
 * Post
 *
 * @ORM\Table(name="posts")
 * @ORM\Entity
 */
class Article
{
    // ...

    /**
     * @ORM\ManyToMany(targetEntity="Tag", inversedBy="posts", orphanRemoval=true, cascade={"persist"})
     * @ORM\JoinTable(name="posts_tags")
     * @ORM\OrderBy({"name" = "ASC"})
     */
    private $tags;

    // ...


    /**
     * Add tags
     *
     * @param \Anyt\BlogBundle\Entity\Tag $tag
     * @return Post
     */
    public function addTag(\Anyt\BlogBundle\Entity\Tag $tag)
    {
        $this->tags[] = $tag;
        $tag->addPost($this);

        return $this;
    }

    /**
     * Remove tags
     *
     * @param \Anyt\BlogBundle\Entity\Tag $tags
     */
    public function removeTag(\Anyt\BlogBundle\Entity\Tag $tag)
    {
        $this->tags->removeElement($tag);
        $tag->removePost($this);
    }

    // ...

}

Tag.php

<?php

namespace Anyt\BlogBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;

/**
 * Tag
 *
 * @ORM\Table(name="tags")
 * @ORM\Entity
 */
class Tag
{

    // ...
    
    /**
     * @var integer
     *
     * @ORM\Column(name="taggedPostsCount", type="integer")
     */
    private $taggedPostsCount = 0;

    /**
     * @ORM\ManyToMany(targetEntity="Post", mappedBy="tags")
     **/
    private $posts;

    // ...

    /**
     * Add posts
     *
     * @param \Anyt\BlogBundle\Entity\Post $post
     * @return Tag
     */
    public function addPost(\Anyt\BlogBundle\Entity\Post $post)
    {
        if (!$this->posts->contains($post)) {
            $this->posts[] = $post;
            $this->taggedPostsCount++;
        }

        return $this;
    }

    /**
     * Remove posts
     *
     * @param \Anyt\BlogBundle\Entity\Post $post
     */
    public function removePost(\Anyt\BlogBundle\Entity\Post $post)
    {
        if ($this->posts->removeElement($post)) {
            $this->taggedPostsCount--;
        }
    }

    // ...
}