Magento Custom Module for add-to-cart Not Working - Observer Triggered

Question

Created module like No other products add to cart if restricted product available in cart and vice versa.

My Module :

app/etc/modules/Brst_Test.xml

<?xml version="1.0"?>
<config>
 <modules>
 <Brst_Test>
 <active>true</active>
 <codePool>community</codePool>
 </Brst_Test>
 </modules>
</config>

This is my observer file

app/code/community/Brst/Test/Model/Observer.php

<?php
ini_set('display_errors', '1');
// Mage::log('fine dude', null, 'logfile.log');
class Brst_Test_Model_Observer
{
 //Put any event as per your requirement
 public function logCartAdd($observer) {
 // Mage::log('good dude', null, 'logfile.log');
 $product = Mage::getModel('catalog/product')
 ->load(Mage::app()->getRequest()->getParam('product', 0));
 $cart_qty = (int) Mage::getModel('checkout/cart')->getQuote()->getItemsQty();
 if ($product->getId()==31588 && $cart_qty > 0) {
 Mage::throwException("You can not add This special Product, empty cart before add it");
 }
 $quote = Mage::getModel('checkout/cart')->getQuote();
 foreach ($quote->getAllItems() as $item) {
 $productId = $item->getProductId();
 if($productId==31588){
 Mage::throwException("Cart has Special Product you can not add another");
 }
 }
 }
}
?>

app/code/community/Brst/Test/etc/config.xml

<?xml version="1.0"?>
<config>
 <modules>
 <Brst_Test>
 <version>1.0.0</version>
 </Brst_Test>
 </modules>
 <global>
 <models>
 <brst_test>
 <class>Brst_Test_Model</class>
 </brst_test>
 </models>
 </global>
 <frontend>
 <events>
 <checkout_cart_product_add_after>
 <observers>
 <Brst_Test_Model_Observer>
 <type>singleton</type>
 <class>Brst_Test_Model_Observer</class>
 <method>logCartAdd</method>
 </Brst_Test_Model_Observer>
 </observers>
 </checkout_cart_product_add_after>
 </events>
 </frontend>
</config>

Not working, how to solve the error?

• nishu: did you get anything in the log file.?
• zus: No, there is no any error in log file?

Answer 1

It should Work according to code.

Try this if your not works

• Ovverride \app\code\core\Mage\Checkout\Model\Cart.php to

   \app\code\local\Mage\Checkout\Model\Cart.php
  

• Find function addProduct($productInfo, $requestInfo=null) in your ovveride file, product add logic written in there

• add code after line `$request = $this->_getProductRequest($requestInfo);

`

public function addProduct($productInfo, $requestInfo=null)
 {
 $product = $this->_getProduct($productInfo);
 $request = $this->_getProductRequest($requestInfo);
 /* ===========Restricted Product Coding Start========== */
 $cart_qty = (int) Mage::getModel('checkout/cart')->getQuote()->getItemsQty();
 $restrictedIds = array(1,2,3); //add restricted product ids here
 if (in_array($product->getId(), $restrictedIds) && $cart_qty > 0) {
 Mage::getSingleton('core/session')->addError('You can not add This special Product, empty cart before add it');
 Mage::getModel('checkout/cart')->getQuote()->setHasError(true);
 return false;
 }
 $quote = Mage::getModel('checkout/cart')->getQuote();
 foreach ($quote->getAllItems() as $item) {
 $productId = $item->getProductId();
 if(in_array($productId, $restrictedIds)){
 Mage::getSingleton('core/session')->addError('Cart has Special Product you can not add another');
 Mage::getModel('checkout/cart')->getQuote()->setHasError(true);
 return false;
 }
 }
 /* ===========Restricted Product Coding End ========== */
 /** @var Mage_Catalog_Helper_Product $helper */
 $helper = Mage::helper('catalog/product');
 .
 .
 .
 .
 .
}

Note : You can call observer overthere and put logic in your observer if you dont want to code in that function

• zus: Working good, but error error message not shown, eg: if i try add restricted product consider cart already have product, if click restricted product add-to-cart button message like product added to cart successfully. FYI -> product not added to cart, iis looking good, my only issue error message not shown properly. @Ketan Borada
• Ketan Borada: i have update my answer, added line Mage::getModel('checkout/cart')->getQuote()->setHasError(true);
• zus: still same error. Product not add but error message not shown.
• zus: code : pastiebin.com/5d19ac92c8eb5
• Ketan Borada: working good for me try to debugging loom.com/share/d7501c1428a14e96ae887ff514db6a76

Answer 2

app\etc\modules\Brst_Test.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <config>
 <modules>
 <Brst_Test>
 <active>true</active>
 <codePool>community</codePool>
 </Brst_Test>
 </modules>
 </config>

app\code\community\Brst\Test\etc\config.xml

 <?xml version="1.0"?>
 <config>
 <modules>
 <Brst_Test>
 <version>1.0.0</version>
 </Brst_Test>
 </modules>
 <global>
 <models>
 <brsttest>
 <class>Brst_Test_Model</class>
 </brsttest>
 </models>
 </global>
 <frontend>
 <events>
 <controller_action_predispatch_checkout_cart_add>
 <observers>
 <brsttest>
 <type>singleton</type>
 <class>brsttest/observer</class>
 <method>logCartAdd</method>
 </brsttest>
 </observers>
 </controller_action_predispatch_checkout_cart_add>
 </events>
 </frontend>
 </config>

app\code\community\Brst\Test\Model\Observer.php

 <?php
 class Brst_Test_Model_Observer extends Mage_Core_Model_Abstract
 {
 public function logCartAdd($observer){
 //I am change this
 $id = Mage::app()->getFrontController()->getRequest()->getParam('product');
 $product = Mage::getModel('catalog/product')->load($id);
 $cart_qty = (int) Mage::getModel('checkout/cart')->getQuote()->getItemsQty();
 // I am change this
 if ($product->getId() == '31588' && $cart_qty > 0) {
 Mage::getSingleton('core/session')->addError('You can not add This special Product, empty cart before add it');
 $url = Mage::getModel('core/url')->getUrl("checkout/cart");
 Mage::app()->getResponse()->setRedirect($url);
 Mage::app()->getResponse()->sendResponse();
 exit;
 }
 $quote = Mage::getModel('checkout/cart')->getQuote();
 foreach ($quote->getAllItems() as $item) {
 $productId = $item->getProductId();
 if($productId == '31588'){
 Mage::getSingleton('core/session')->addError('Cart has Special Product you can not add another');
 $url = Mage::getModel('core/url')->getUrl("checkout/cart");
 Mage::app()->getResponse()->setRedirect($url);
 Mage::app()->getResponse()->sendResponse();
 exit;
 }
 }
 }
 }

Try this code

• zus: Thanks for your reply, not working still other products added to cart if restricted products available in cart. code -> pastiebin.com/5d1597f887f17 @Vijay-CyberLocker
• zus: In your code also same, observer triggered, but condition not working @Vijay-CyberLocker
• user55776: Ok brother give me few minutes i will update my answer.
• zus: i just want to know if my class right in observer class : <class>brst_test/observer</class> in config.xml
• zus: Still adding other products.