/**
* Updating Site Relations for new sites.
*
* @param int $blog_id
* @return int Number of affected rows.
*/
private function update_relation($blog_id)
{
if (empty($_POST['related_blogs'])) {
return 0;
}
$new_related = (array) $_POST['related_blogs'];
$related = array_map('intval', $new_related);
return $this->site_relation->insert_relations($blog_id, $related);
}