$page = $this->pageRepo->getBySlug($pageSlug, $book->id);
$this->checkOwnablePermission('page-delete', $page);
Activity::addMessage('page_delete', $book->id, $page->name);
$page = $this->pageRepo->getBySlug($pageSlug, $book->id);
$this->checkOwnablePermission('page-delete', $page);
Activity::addMessage('page_delete', $book->id, $page->name);