protected function _getResource()
{
if (is_null($this->childMode)) {
return parent::_getResource();
}
if (empty($this->_resourceName) && empty($this->_resource)) {
throw new \Magento\Framework\Exception\LocalizedException(new \Magento\Framework\Phrase('The resource isn\'t set.'));
}
return $this->_resource ?: \Magento\Framework\App\ObjectManager::getInstance()->get($this->_resourceName)->setChildMode($this->childMode);
}
