public function rules()
{
// NOTE: you should only define rules for those attributes that
// will receive user inputs.
return array(array('name, description, comments, position_id, acon, sf, pACD, a0, a1, a2, active', 'safe'), array('name, description, acon', 'required'), array('id, name', 'safe', 'on' => 'search'));
}