/**
* @param FieldConfig|string $field
* @return mixed|null
*/
public function getCellValue($field)
{
if (!$field instanceof FieldConfig) {
$field = $this->grid->getConfig()->getColumn($field);
}
if (!$field instanceof IdFieldConfig && $this->uses($field)) {
return parent::getCellValue($field);
} else {
return null;
}
}
