$revision = $page->revisions()->where('id', '=', $revisionId)->first();
$page->fill($revision->toArray());
$page->slug = $this->findSuitableSlug('page', $page->name, $page->id, $book->id);
$revision = $page->revisions()->where('id', '=', $revisionId)->first();
$page->fill($revision->toArray());
$page->slug = $this->findSuitableSlug('page', $page->name, $page->id, $book->id);