$book = $this->entityRepo->getBySlug('book', $bookSlug);
$this->checkOwnablePermission('book-delete', $book);
Activity::addMessage('book_delete', 0, $book->name);
$book = $this->entityRepo->getBySlug('book', $bookSlug);
$this->checkOwnablePermission('book-delete', $book);
Activity::addMessage('book_delete', 0, $book->name);