Cannot update Stock Item Quantity for a Product in Magento 1.6.2

Question

I am trying to update the stock quantities of products in Magento from within a script.

I load the product, set the stock quantity, and save - but the quantity remai

Answer 1

I've solved it myself:

// get stock data
$stockData = $product->getStockItem();
printf(PHP_EOL.'Stock: qty=%d, instock=%s, man_stock=%s, use_cfg_man_stock=%s'.PHP_EOL,
    $stockData->getData('qty'),
    $stockData->getData('is_in_stock'),
    $stockData->getData('manage_stock'),
    $stockData->getData('use_config_manage_stock')
);
// prints out qty=0, instock=, man_stock=, use_cfg_man_stock=


// $stockQty = 1
$stockItem = Mage::getModel('cataloginventory/stock_item');
$stockItem->assignProduct($product);
$stockItem->setData('is_in_stock', 1);
$stockItem->setData('stock_id', 1);
$stockItem->setData('store_id', 1);
$stockItem->setData('manage_stock', 0);
$stockItem->setData('use_config_manage_stock', 0);
$stockItem->setData('min_sale_qty', 0);
$stockItem->setData('use_config_min_sale_qty', 0);
$stockItem->setData('max_sale_qty', 1000);
$stockItem->setData('use_config_max_sale_qty', 0);
$stockItem->setData('qty', $stockQty);
$stockItem->save();

$product->save();                           
$product->load();                           
$stockData = $product->getStockItem();
printf('New Stock: qty=%d, instock=%s, man_stock=%s, use_cfg_man_stock=%s'.PHP_EOL,
    $stockData->getData('qty'),
    $stockData->getData('is_in_stock'),
    $stockData->getData('manage_stock'),
    $stockData->getData('use_config_manage_stock')
);
// prints out qty=1, instock=1, man_stock=0, use_cfg_man_stock=0

By creating a new StockItem, and assigning that to the product. Hope this helps someone else.

Answer 2

All you were missing is to save the $stockItem. You shouldn't need to create a new stock_item nor should you have to save the product.

if (!($stockItem = $product->getStockItem())) {
    $stockItem = Mage::getModel('cataloginventory/stock_item');
    $stockItem->assignProduct($product)
              ->setData('stock_id', 1)
              ->setData('store_id', 1);
}
$stockItem->setData('qty', $stockQty)
          ->setData('is_in_stock', $stockQty > 0 ? 1 : 0)
          ->setData('manage_stock', 1)
          ->setData('use_config_manage_stock', 0)
          ->save();

Answer 3

In my case I got the same problem with products that I've imported programmatically. I just realized that I forgot to add stock_data in the array...

'name' => $productName,
'stock_data' => array(
                        'use_config_manage_stock' => 0,
                        'manage_stock' => 0,
                        'qty' => 0,
                        'stock_id' => 1,
                        'min_qty' => 0,
                    )

Without stock data information, Magento generates an exception(at \Mage_CatalogInventory_Model_Stock_Item) when adding product to cart.

With this node, it works. =)

Answer 4

To display stock quantity for the product -

 <?php echo $stock = Mage::getModel('cataloginventory/stock_item')->loadByProduct($_product); ?>

And if you want to display individual data use this -

<?php echo $stock->getQty(); ?> // Will display stock quantity
<?php echo $stock->getMinQty(); ?> // Will display minimum quantity
<?php echo $stock->getMinSaleQty(); ?> //will display minimum salable quantity