svscorp

Кстати, собственно реализация решения… вдруг пригодиться:

1) Создаем Entity:

<?php
// src/Acme/DemoBundle/Entity/Category.php
namespace Acme\DemoBundle\Entity;

use Gedmo\Mapping\Annotation as Gedmo;
use Doctrine\ORM\Mapping as ORM;

/**
 * @Gedmo\Tree(type="nested")
 * @ORM\Table(name="categories")
 * use repository for handy tree functions
 * @ORM\Entity(repositoryClass="Gedmo\Tree\Entity\Repository\NestedTreeRepository")
 */
class Category
{
    /**
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue
     */
    private $id;

    /**
     * @Gedmo\Translatable
     * @ORM\Column(name="title", type="string", length=64)
     */
    private $title;

    /**
     * @Gedmo\TreeLeft
     * @ORM\Column(name="lft", type="integer")
     */
    private $lft;

    /**
     * @Gedmo\TreeLevel
     * @ORM\Column(name="lvl", type="integer")
     */
    private $lvl;

    /**
     * @Gedmo\TreeRight
     * @ORM\Column(name="rgt", type="integer")
     */
    private $rgt;

    /**
     * @Gedmo\TreeRoot
     * @ORM\Column(name="root", type="integer", nullable=true)
     */
    private $root;

    /**
     * @Gedmo\TreeParent
     * @ORM\ManyToOne(targetEntity="Category", inversedBy="children")
     * @ORM\JoinColumn(name="parent_id", referencedColumnName="id", onDelete="CASCADE")
     */
    private $parent;

    /**
     * @ORM\OneToMany(targetEntity="Category", mappedBy="parent")
     * @ORM\OrderBy({"lft" = "ASC"})
     */
    private $children;

    /**
     *

     * @Gedmo\Translatable

     * @Gedmo\Slug(fields={"title"})

     * @ORM\Column(name="slug", type="string", length=128)

     */

    private $slug;

    public function getId()
    {
        return $this->id;
    }

    public function getSlug()

    {

        return $this->slug;

    }

    public function setTitle($title)
    {
        $this->title = $title;
    }

    public function getTitle()
    {
        return $this->title;
    }

    public function setParent(Category $parent = null)
    {
        $this->parent = $parent;
    }

    public function getParent()
    {
        return $this->parent;
    }
}

2. В контроллере реализуем добавление категорий:

            use Acme\DemoBundle\Entity\Category as CategoryEntity;

            // ... your code before
            $em = $this->getDoctrine()->getManager();
            $cat1= new CategoryEntity();
            $cat1->setTitle('Фрукты');
            
            $subcat = new CategoryEntity();
            $subcat->setTitle('Экзотические');
            $subcat->setParent($cat1);
     
            $cat2 = new CategoryEntity();
            $cat2->setTitle('Овощи');

            $em->persist($cat1);
            $em->persist($cat2);
            $em->persist($subcat);
            $em->flush();
     

Вы получите меню вида:
— Фрукты
— — Экзотические
— Овощи

3) Получаем список категорий (в виде массива):

// ...
$categoryEntity = $this->em->getRepository('Acme\DemoBundle\Entity\Category');
$categories = $categoryEntity->childrenHierarchy();
// ...

Успехов!