protected function _setCollectionOrder($column)
{
$collection = $this->getCollection();
if ($collection) {
$columnIndex = $column->getFilterIndex() ? $column->getFilterIndex() : $column->getIndex();
if (strpos($columnIndex, 'am_attribute_') !== FALSE) {
$attribute = str_replace('am_attribute_', '', $columnIndex);
$collection->addAttributeToSort($attribute, $column->getDir());
} else {
if ($columnIndex == "low_stock") {
$collection->getSelect()->order("low_stock " . $column->getDir());
} else {
if ($columnIndex == "thumbnail") {
$collection->addAttributeToSort($columnIndex, $column->getDir());
} else {
parent::_setCollectionOrder($column);
}
}
}
}
return $this;
}
