$page = $this->entityRepo->getBySlug('page', $pageSlug, $bookSlug);
} catch (NotFoundException $e) {
$page = $this->entityRepo->getPageByOldSlug($pageSlug, $bookSlug);
$page = $this->entityRepo->getBySlug('page', $pageSlug, $bookSlug);
} catch (NotFoundException $e) {
$page = $this->entityRepo->getPageByOldSlug($pageSlug, $bookSlug);