show only items without relationship

// show only items without relationship
function func_check_item_has_child( $query, $view_settings, $view_id ){

    if ( in_array( $view_id, array( 70693) ) && !empty( $query->posts ) ){
     $all_posts = $query->posts;
        foreach ($query->posts as $key => $parent) {

            // get the child posts of the parent post
            $children = toolset_get_related_posts(
                $parent->ID,
                'related-' .$parent->post_type,
                'parent',
                 1,
                 0,
                 array(),
                 'post_id',
                 'child'
            );


            if ( !empty($children) ) {

                unset( $query->posts[$key] );
                $query->found_posts = $query->found_posts - 1;
                $query->post_count = $query->post_count - 1;

            }


        }

        $query->posts = array_values( $query->posts );
    }

    return $query;
}
add_filter( 'wpv_filter_query_post_process', 'func_check_item_has_child', 1001, 3 );