return array_merge(parent::rules(), array( ...rules for the child class... ));
public function rules() { return array_merge(parent::rules(), array(array('moduleID', 'filter', 'filter' => 'trim'), array('moduleID', 'required'), array('moduleID', 'match', 'pattern' => '/^\\w+$/', 'message' => '{attribute} should only contain word characters.'))); }