I've created a new module in order to add a column to the product list displayed in the admin section of Magento. The column is displaying an ID and I want it to display the name (from another table) belonging to that ID.


<?xml version="1.0"?>




class Mypackage_Customgrid_Model_Observer extends Varien_Event_Observer {

    public function appendCustomColumn(Varien_Event_Observer $observer) {
        $block = $observer->getBlock();
        if (!isset($block)) {
            return $this;

        if ($block->getType() == 'adminhtml/catalog_product_grid') {
            /* @var $block Mage_Adminhtml_Block_Customer_Grid */
            $block->addColumnAfter('udropship_vendor', array(
                'header'    => 'Vendor',
                'index'     => 'udropship_vendor',
                'type'  => 'text',
            ), 'visibility');

As you can see in the above code, I'm using the uDropship extension. The above code display the vendor ID related to each product, but I would like this column to display the vendor name related to each product.

I've tried to change the collection fetch in the file app/code/core/Adminhtml/Block/Catalog/Product/Grid.php (only for test purpose, I'll overwrite this file if I find how to do that). But I don't understand how to get the name value from the database.

Btw, the table schema in which the data I want to display is stored looks like something like that

table: magentoudropship_vendor

Is anyone capable of guiding me through this ? Anything which can help me to understand how to manipulate the database is welcome.

1 Answer 1


app/code/core/Adminhtml/Block/Catalog/Product/Grid.php is the right place to start. What you need to do is rewrite Mage_Adminhtml_Block_Catalog_Product_Grid::_prepareCollection and join magentoudropship_vendor, so that you have access to the vendor_name for the grid. I'm assuming you have vendor_id as an attribute to the product (correct me if I'm wrong).

Additionally, I would add the column to the product list grid in this rewrite. See Mage_Adminhtml_Block_Catalog_Product_Grid::_prepareColumns. This is where you can add additional columns.

You need something like...

protected function _prepareCollection()
    $resource = Mage::getSingleton('core/resource');
    $collection = Mage::getModel('catalog/product')->getCollection()

            array('v' => $resource->getTableName('...')), // Insert approprirate alias to get `magentoudropship_vendor`
            'main_table.vendor_id = v.vendor_id',
            array('vendor_name')    // List of wanted columns from the custom table

Alias for the getTableName() method is found in your config.xml of the uDropShip extension. e.g. model_alias/table_name. Copy and paste the <models>...<models> if you're still not sure.

  • The block holds the collection, so you could also call $block->getCollection() in the observer, right?
    – 7ochem
    Mar 16, 2015 at 13:21
  • Thanks for you response. I just have a few questions: 1. where does $resource come from ? I don't have this variable in the Grid.php 2. you talk about the alias to get the database ? is it the database name or should I use something else ? And you're right, the udropship_vendor used in my custom column is a product's attribute.
    – chris
    Mar 16, 2015 at 13:27
  • @7ochem, I extend _prepareCollection when I modify grids because you can do everything in one rewrite. I have used other approaches in modifying grids (observer, XML update, etc.) but I find the block rewrite to be the best.
    – laketuna
    Mar 16, 2015 at 13:31
  • @christophe, updated the ansnwer.
    – laketuna
    Mar 16, 2015 at 13:36
  • This works now, I'll continue to look for information about database manipulation with Magento though. Thank you.
    – chris
    Mar 16, 2015 at 15:28

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