Exclude unapproved drafts from search results

Hi,

I need to exclude unapproved posts submitted by my users from my search results.

I tried applying this in my functions.php file

function mySearchFilter($query) {
	if ($query->is_search) {
		$query->set('post_status', 'publish');
	}
	return $query;
}

add_filter('pre_get_posts','mySearchFilter');

but it did not work. I also tried other solutions, but nothing worked.

Any ideas? Thanks in advance!