Ok, I see what you need. You want to restrict the results where the “Ajax Search” custom field exists.
That’s a bit harder, but not impossible. I have a solution, which will work with the Regular engine.
Try putting this filtering function to the functions.php file in your active theme directory:
[php]add_filter( ‘asp_cpt_query_add_where’, ‘asp_add_extra_where’, 1, 1 );
function asp_add_extra_where( $query ) {
global $wpdb;
// Change this to the custom field name
$custom_field = "custom_field";
$query .= " AND EXISTS(SELECT 1 FROM $wpdb->postmeta as pm
WHERE pm.post_id = $wpdb->posts.ID AND pm.meta_key = ‘$custom_field’)";
return $query;
}[/php]
Change the $custom_field = … variable to the custom field key. This will add an extra paramter to the query to do a very fast check for custom field existence of the the given custom field for the result set.