Newscoop\Entity\Article::addAttachment PHP Метод

    public function addAttachment(Attachment $attachment)
    {
        $this->attachments->add($attachment);
        return $this;
    }

 public function addAttachmentToArticle(Article $article, Attachment $attachment)
 {
     $article->addAttachment($attachment);
     $this->em->flush();
 }