public function validateKeyCodePair($attribute)
{
$existValidator = \Yii::createObject(['class' => ExistValidator::className(), 'targetClass' => Language::className(), 'targetAttribute' => 'code']);
$errorLangExists = null;
$existValidator->validate($this->lang_code, $errorLangExists);
if (!empty($errorLangExists)) {
$this->addError('lang_code', $errorLangExists);
} else {
if (($testItem = $this->findOne(['key' => $this->key, 'lang_code' => $this->lang_code])) && $testItem->id != $this->id) {
$this->addError($attribute, \Yii::t('support', 'Key must be unique for selected language'));
}
}
}
