public function rules()
{
// NOTE: you should only define rules for those attributes that
// will receive user inputs.
return array(array('element_id, eye_id, fluidtype_id', 'safe'), array('element_id, eye_id, fluidtype_id', 'required'), array('id, element_id, fluidtype_id', 'safe', 'on' => 'search'));
}