$this->checkPermission('chapter-update');
$book = $this->bookRepo->getBySlug($bookSlug);
$chapter = $this->chapterRepo->getBySlug($chapterSlug, $book->id);
$this->checkPermission('chapter-update');
$book = $this->bookRepo->getBySlug($bookSlug);
$chapter = $this->chapterRepo->getBySlug($chapterSlug, $book->id);