src/Model/Article.php
public function attachVideo(Video $video): self
    {
        return $this->attach(
            self::ATTACHMENT_FIELD_VIDEO,
            $this->ensureOrder(
                $video,
                self::ATTACHMENT_FIELD_VIDEO
            )
        );
    }
public function attachVideo(Video $video): self
    {
        return $this->attach(
            self::ATTACHMENT_FIELD_VIDEO,
            $this->ensureOrder(
                $video,
                self::ATTACHMENT_FIELD_VIDEO
            )
        );
    }
attach Video