public function actionDistricts()
{
$country = Yii::$app->request->post('country');
if (empty($country) || $country === 'undefined') {
return null;
}
$province = Yii::$app->request->post('province');
if (empty($province) || $province === 'undefined') {
return null;
}
$city = Yii::$app->request->post('city');
if (empty($city) || $city === 'undefined') {
return null;
}
return District::asArray(Country::get($country)->getProvince($province)->getCity($city)->districts);
}
