Magento custom sort on grid – sort increment_id by numeric not alpha

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You can easily filter column in a magento grid (see my previous post) but customize a sort is a little bit more hand made.

In this example in the order grid, I want to sort by increment_id, but this is a text fields and I want to sort it by numeric.

default sort : 1, 10, 100, 2, 3 …
numeric sort : 1, 2, 3, 10, 100 …

If you look the SQL request, you got this

SELECT `main_table`.* FROM `sales_flat_order_grid` AS `main_table` ORDER BY increment_id DESC LIMIT 20

To tell MySQL to sort this text column by numeric, you can add “+ 0″ to the ORDER BY clause, this will transform the text field into numeric field

SELECT `main_table`.* FROM `sales_flat_order_grid` AS `main_table` ORDER BY increment_id + 0 DESC LIMIT 20

Now, how to tell Magento to add “+ 0″ to this sort ?

Override your grid class and modify the “_setCollectionOrder($column)” function.

class Adin_Sales_Block_Adminhtml_Sales_Order_Grid extends Mage_Adminhtml_Block_Sales_Order_Grid {
    protected function _setCollectionOrder($column)
    {
        $collection = $this->getCollection();
        if ($collection) {
            $columnIndex = $column->getFilterIndex() ? $column->getFilterIndex() : $column->getIndex();
            if($columnIndex == 'increment_id')
            {
                $columnIndex = 'increment_id + 0';
            }
            $collection->setOrder($columnIndex, strtoupper($column->getDir()));
        }
        return $this;
    }
}

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