public function findPublishedCollectionPageBySlug($collectionSlug, $pageSlug)
    {
        $this->makeCollectionPageSelect();
        $this->sql .= " and p.published_date <= '{$this->today()}'";
        $this->sql .= ' and c.slug = ? and p.slug = ?';

        $this->bindValues[] = $collectionSlug;
        $this->bindValues[] = $pageSlug;

        return $this->findRow();
    }