/**
* Try to get mapped field name for filter to collection
*
* @param string
* @return string
*/
protected function _getMappedField($field)
{
$mappedFiled = parent::_getMappedField($field);
if ($mappedFiled == $field) {
$mappedFiled = "main_table." . $mappedFiled;
}
return $mappedFiled;
}
