/**
* Applies filter to query by attribute
*
* @param FilterDatasourceAdapterInterface $ds
* @param string $field
* @param string $operator
* @param mixed $value
*/
public function applyFilter(FilterDatasourceAdapterInterface $ds, $field, $operator, $value)
{
$ds->getProductQueryBuilder()->addFilter($field, $operator, $value);
}
