get id of simple product of any configurable product on cart.phtml magento

Question

I am working with configurable product, I want simple product id of configurable product on cart.phtml, I am using this code

 <?php foreach($this->getItems() as $_item): ?>
$_product = $_item->getProduct();
echo $_product->getId();
 <?php endforeach ?>

but it always gives main product id, but I need its simple product id , any one help please.

Answer 1

In quote item table magento have sku and product id. For Configurable product's cart , 'sku' is simple product sku and product id is configurable product 'id'. SO, you need to load product by sku

<?php foreach($this->getItems() as $_item): ?>
 $_Configproduct = $_item->getProduct();
 $simpleProduct=Mage::getModel('catalog/product')->loadByAttribute('sku', $_item->getSku());
echo $simpleProduct->getId();
<?php endforeach ?

Answer 2

Try this : $_item->getOptionByCode('simple_product')->getProduct()->getId()

Source : https://stackoverflow.com/questions/18027524/get-simple-product-from-configurable-in-cart

After taking a look at how Magento renders the items in your cart on the checkout/cart page, I was able to find this in app/code/core/Mage/Checkout/Block/Cart/Item/Renderer/Configurable.php

/**
 * Get item configurable child product
 *
 * @return Mage_Catalog_Model_Product
 */
public function getChildProduct()
{
    if ($option = $this->getItem()->getOptionByCode('simple_product')) {
        return $option->getProduct();
    }
    return $this->getProduct();
}

So, applying it to the snippet in the question, it would be

foreach ($cart->getQuote()->getAllVisibleItems() as $item) {
    $productId = $item->getProduct()->getId();
    if ($option = $item->getOptionByCode('simple_product')) {
        $productId = $option->getProduct()->getId();
    }
    $productIds[] = $productId;
}

Answer 3

So, $this->getItems() actually calls:

$this->getQuote()->getAllVisibleItems();

Which only returns products you actually see on the cart page (configurable, stand-alone simple, bundle, etc).

You need the simple. So here we go (This code I tested in checkout/cart/item/default.phtml).

if ($_item->getProductType() == Mage_Catalog_Model_Product_Type::TYPE_CONFIGURABLE)
{
      //Return first item of the array, in the case of 'configurable', it will be a one item array.
      $_simpleItem = reset($_item->getChildren());

      //print out simple id
      echo $_simpleItem->getProductId();
}

Answer 4

Magento itself provides the solution of getting the simple product object from configurable in the following file class:

Mage_Checkout_Block_Cart_Item_Renderer_Configurable

function name is getChildProduct() which returns the simple product object from configurable one.

public function getChildProduct()
{
    if ($option = $this->getItem()->getOptionByCode('simple_product')) {
        return $option->getProduct();
    }
    return $this->getProduct();
}