using category__and with relevanssi_modify_wp_query

Hello and thank you for sharing this great plugin!

The category__and support is an excellent addition. In order to use it, I’ve set up this filter and function:

add_filter('relevanssi_modify_wp_query', 'category_filter');

function category_filter($wp_query) {
    $cat = $wp_query->query_vars['cat'];
    if(intval($cat) > 0 && $_REQUEST['and']){
        $secondcat = get_category_by_slug(strip_tags($_REQUEST['and']));

        $wp_query->query_vars['category__in'] = array($cat);
        $wp_query->query_vars['category__and'] = array($cat,$secondcat->cat_ID);

        return $wp_query;
    }
}

However, if there’s no category id (for All categories), it seems to be checking for ‘cat’ that before it gets to the if statement and shows this warning:

Warning: Division by zero in … /wp-content/plugins/relevanssi/lib/search.php on line 912

I’ve wrapped the entire filter and function in:

if(intval($_REQUEST['cat']) > 0 && $_REQUEST['and']){ }

but wanted to post this in case I’m overlooking a better way to approach this.

Thanks!

http://wordpress.org/extend/plugins/relevanssi/