public function numPages()
    {
        if ($this->numPage) {
            $this->numPage;
        };

        $entries = $this->entries();
        $count = count($entries);

        if ($this->numPerPage()) {
            $this->numPage = ceil($count / $this->numPerPage());
        } else {
            $this->numPage = 1;
        }

        return $this->numPage;
    }