$book = $this->bookRepo->getBySlug($bookSlug);
$chapter = $this->chapterRepo->getBySlug($chapterSlug, $book->id);
$this->checkOwnablePermission('restrictions-manage', $chapter);
$book = $this->bookRepo->getBySlug($bookSlug);
$chapter = $this->chapterRepo->getBySlug($chapterSlug, $book->id);
$this->checkOwnablePermission('restrictions-manage', $chapter);