protected function loadMessagesFromDb($category, $language)
{
$mainQuery = (new Query())->select(['message' => 't1.message', 'translation' => 't2.translation'])->from(['t1' => $this->sourceMessageTable, 't2' => $this->messageTable])->where(['t1.id' => new Expression('[[t2.id]]'), 't1.category' => $category, 't2.language' => $language]);
$fallbackLanguage = substr($language, 0, 2);
$fallbackSourceLanguage = substr($this->sourceLanguage, 0, 2);
if ($fallbackLanguage !== $language) {
$mainQuery->union($this->createFallbackQuery($category, $language, $fallbackLanguage), true);
} elseif ($language === $fallbackSourceLanguage) {
$mainQuery->union($this->createFallbackQuery($category, $language, $fallbackSourceLanguage), true);
}
$messages = $mainQuery->createCommand($this->db)->queryAll();
return ArrayHelper::map($messages, 'message', 'translation');
}
