Display custom price in all the web for a group of customers

Question

I need to display a custom price for some products to a certain group of customers. I made it, but I only see the custom price in the product view page, and I need to display it in all the web. Now I see the regular price in the product list, and it should also display the custom price.

First I created the custom price attribute private_price for the products.

Then I created a module, and listen for the catalog_product_get_final_price event:

<events>
    <catalog_product_get_final_price>
        <observers>
            <catalog_product_get_final_price_handler>
                <type>singleton</type>
                <class>privatesales/observer</class>
                <method>modifyFinalPrice</method>
            </catalog_product_get_final_price_handler>
        </observers>
     </catalog_product_get_final_price>
</events>

and in the observer:

public function modifyFinalPrice(Varien_Event_Observer $observer)
{
    $isLoggedIn = Mage::getSingleton('customer/session')->isLoggedIn();
    /* If customer is logged in */
    if($isLoggedIn) {
        /* Get the logged in customer's group ID */
        $customerGroupId = Mage::getSingleton('customer/session')->getCustomerGroupId();
        /* Check if the logged in customer's group ID matches with the ID you are after */
        if ($customerGroupId==2) {
            $product = $observer->getEvent()->getProduct();
            $privatePrice = (double) $product->getPrivatePrice();
            if ($privatePrice>0 && !empty($privatePrice) && !is_null($privatePrice)) {
                $product->setFinalPrice($privatePrice);
            }
        }  
    }
}

I'm using magento 1.9.2.4

Update: I also tried the event catalog_product_load_after with same result, price changed in product view, but price remains unchanged in product list.

Answer 1

I used event for product list catalog_product_collection_load_after

config.xml

<catalog_product_collection_load_after>
    <observers>
        <brolab_erp>
            <type>singleton</type>
            <class>brolab_erp/observer</class>
            <method>catalogProductCollectionLoadAfter</method>
        </brolab_erp>
    </observers>
</catalog_product_collection_load_after>

Observer.php

/**
 * @param Varien_Event_Observer $observer
 * @return $this
 */
public function catalogProductCollectionLoadAfter(Varien_Event_Observer $observer)
{
    $collection = $observer->getEvent()->getData('collection');
    /** @var Mage_Catalog_Model_Product $item */
    foreach ($collection->getItems() as $item) {
        /* your code */
    }
    return $this;
}

Answer 2

You can set Tier Price of product with respect to customer Group. So, You can get this feature from Magento Backend by default. No need to implement extra code.

try it & let me know.