So I have this requirement where I need to round product prices based on several criteria for one specific currency.

So when watching the catalog (category view / product view whatever) the prices need to be updated on the fly.

I managed to get it right by using the following observer:


Then in my observer I did:

public function roundPrice(Varien_Event_Observer $observer) {

    // check if are using NZD conversion
    if (!preg_match("/NZD/i", $code = Mage::app()->getStore()->getCurrentCurrencyCode())) {

    $newPrice = $this->_getPriceLogic($observer->getProduct());

That works fine for the product view page but does not work on the category page. It seems like catalog_product_get_final_price event is not dispatched on the category page.

I tried to observer catalog_product_collection_load_after event and use the following code but it does not seem to work entirely.

Instead of displaying my rounded price is displays:

rounded price as low as original price

public function roundPriceCollection($observer) {

    // check if are using NZD conversion
    if (!preg_match("/NZD/i", $code = Mage::app()->getStore()->getCurrentCurrencyCode())) {

    $event = $observer->getEvent();
    $products = $observer->getCollection();
    foreach( $products as $product ) {
    return $this;

Thus I'm wondering what is the best approach to implement such feature.

  • 2
    I posted the same problem on the old forum a million years ago, but that does not work anymore: magentocommerce.com/bug-tracking/issue?issue=10777. All I remember is that the catalog_product_get_final_price method is not dispatched for collections. The recommendation from the core team was to use catalog_product_collection_load_after as you tried and it involved changing the attribute price in the base currency so the conversion ends up at a rounded value.
    – Marius
    Commented May 31, 2016 at 7:42
  • @Marius see my edit. Basically using catalog_product_collection_load_after displays rounded price as low as original price Commented May 31, 2016 at 7:44
  • 1
    That's why you need to change price and final_price and other prices, so it will look like the original price is the rounded value.
    – Marius
    Commented May 31, 2016 at 7:47
  • @Marius Imma make some tests ;) Commented May 31, 2016 at 7:47

3 Answers 3


Thanks to @Marius, @Vinai and @AndreasVonStudnitz here's how I managed to get it right.

So the catalog_product_get_final_price is only for display purpose on the product view page and the final price from the category and checkout pages come from the price index database table.

Thus I was right using catalog_product_collection_load_after

However, to fix the As Low As display issue I had to add the following code to my observer code:


Of course, as this was for a simple product not on sale it was an easy case and I'll probably have some adjustements to make in order to get it working for every case but I got the idea now.

  • Did you find lot of troubles with this, making that custom price prevail during the whole checkout process? I need to do something like that Commented Jul 26, 2016 at 12:45
  • @RaulSanchez not really apart from the issue I faced in my question and solved by my answer I didn't face any issue Commented Jul 26, 2016 at 13:03

A wild idea.
You say that it works for the product details page because the event catalog_product_get_final_price is triggered.
How about making it trigger in the list page?
The event is not triggered in the event page because the getFinalPrice method looks like this:

public function getFinalPrice($qty=null)
    $price = $this->_getData('final_price');
    if ($price !== null) {
        return $price;
    return $this->getPriceModel()->getFinalPrice($qty, $this);

The event is dispatched in the method Mage_Catalog_Model_Product_Type_Price::getFinalPrice.
You can try to rewrite the method it means the getFinalPrice from the product model and skip the verification for $price = $this->_getData('final_price'); when the currency is NZD.
Or change it to something like

public function getFinalPrice($qty=null)
    $price = $this->_getData('my_final_price'); //change the attributehere
    if ($price !== null) {
        return $price;
    return $this->getPriceModel()->getFinalPrice($qty, $this);

then rewrite the getFinalPrice method from Mage_Catalog_Model_Product_Type_Price and make sure it sets the value for my_custom_price also.
And in order to make sure you don't get in the list something like regular price / promo price apply your price logic to the price minimal_price and special_price and all other prices that might be involved in the price.phtml file.
I didn't test this, but it looks like it's worth a try.


For update pricing or any product attribute like name, description, you can use the event catalog_product_collection_load_after and php observer function would be like below.

public function priceupdate(Varien_Event_Observer $observer){ $products = $observer->getCollection(); foreach( $products as $product ) { $product->setMinimalPrice($priceincfriegt); $product->setPrice($priceincfriegt); } return $this; }

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