/**
     * The parent forum
     * @ORM\ManyToOne(targetEntity="\TYPO3\FORUM\Domain\Model\Forum")
     * @var \TYPO3\FORUM\Domain\Model\Forum
     */
    protected $parent;

    /**
     * Childrens Forum
     * @var \Doctrine\Common\Collections\ArrayCollection<\TYPO3\FORUM\Domain\Model\Forum>
     */
    private $children;