How to do selected single product should be purchase alone?

[Aveeva]

I have one restricted product, here how to do selected single product should be purchased alone? No other products are eligible to add add-to-cart if this product available in the add-to-cart, same if other products available in add-to-cart this product not eligible to add add-to-cart.

Workout-> https://gist.github.com/aveevan/909d4481bc8fe663acc0799e90f2aca7 not working.

[Sunil Patel]

Hello @Aveeva 

Code looking good.

Have you checked disabled compile and cache flush after module install? 

One thing can you please change it

<frontend>
        <events>
            <controller_action_predispatch_checkout_cart_add>
                <observers>
                    <brst_test_log_cart_add>
                        <class>brst_test/observer</class>
                        <method>logCartAdd</method>
                    </brst_test_log_cart_add>
                </observers>
            </controller_action_predispatch_checkout_cart_add>
        </events>
    </frontend>

to 

<frontend>
        <events>
            <controller_action_predispatch_checkout_cart_add>
                <observers>
                    <brst_test_log_cart_add>
                        <class>Brst_Test_Model_Observer</class>
                        <method>logCartAdd</method>
                    </brst_test_log_cart_add>
                </observers>
            </controller_action_predispatch_checkout_cart_add>
        </events>
    </frontend>

Hope it will help you.

If works then mark as a solution.

[Aveeva]

@Sunil Patel  Still adding other products,  anything is missed?

[Sunil Patel]

Hello @Aveeva 

can you change version something else like 0.1.0 as per magento all module three dot and into your module four.

if still not work then move events to global area and check it.

[Aveeva]

@Sunil Patel  Version changing not working, 

<?xml version="1.0"?>
<config>
    <modules>
        <Brst_Test>
            <version>0.1.0</version>
        </Brst_Test>
    </modules>
    <global>
        <models>
            <brst_test>
                <class>Brst_Test_Model</class>
            </brst_test>
        </models>
    </global>

    <frontend>
        <events>
            <controller_action_predispatch_checkout_cart_add>
                <observers>
                    <brst_test_log_cart_add>
                        <class>Brst_Test_Model_Observer</class>
                        <method>logCartAdd</method>
                    </brst_test_log_cart_add>
                </observers>
            </controller_action_predispatch_checkout_cart_add>
        </events>
    </frontend>
</config>

After move events to a global area, still not working

<?xml version="1.0"?>
<config>
    <modules>
        <Brst_Test>
            <version>0.1.0</version>
        </Brst_Test>
    </modules>
    <global>
        <models>
            <brst_test>
                <class>Brst_Test_Model</class>
            </brst_test>
        </models>

            <events>
                <controller_action_predispatch_checkout_cart_add>
                    <observers>
                        <brst_test_log_cart_add>
                            <class>Brst_Test_Model_Observer</class>
                            <method>logCartAdd</method>
                        </brst_test_log_cart_add>
                    </observers>
                </controller_action_predispatch_checkout_cart_add>
        </events>

    </global>

    <!-- <frontend>
        <events>
            <controller_action_predispatch_checkout_cart_add>
                <observers>
                    <brst_test_log_cart_add>
                        <class>Brst_Test_Model_Observer</class>
                        <method>logCartAdd</method>
                    </brst_test_log_cart_add>
                </observers>
            </controller_action_predispatch_checkout_cart_add>
        </events>
    </frontend> -->
</config>

[Sunil Patel]

Hello @Aveeva 

First check is your compiler on? 

is yes then disabled it.

[Aveeva]

@Sunil Patel  My compiler status disabled, 

caps and the small case name is okay for below code,

<?xml version="1.0"?>
<config>
    <modules>
        <Brst_Test>
            <version>0.1.0</version>
        </Brst_Test>
    </modules>
    <global>
        <models>
            <brst_test>
                <class>Brst_Test_Model</class>
            </brst_test>
        </models>
    </global>

    <frontend>
        <events>
            <controller_action_predispatch_checkout_cart_add>
                <observers>
                    <brst_test_log_cart_add>
                        <class>Brst_Test_Model_Observer</class>
                        <method>logCartAdd</method>
                    </brst_test_log_cart_add>
                </observers>
            </controller_action_predispatch_checkout_cart_add>
        </events>
    </frontend>
</config>

[Aveeva]

How to use the log and how to find out where is the error presented?

[Aveeva]

@Sunil Patel  FYI 

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

<?php
// Mage::log('Hy observer called', null, 'logfile.log');
class Brst_Test_Model_Observer
{
    //Put any event as per your requirement
    public function logCartAdd() {
        $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");
        }

        // $quote = Mage::getSingleton('checkout/session')->getQuote();
        // if ($quote->hasProductId(2)) {
        //  Mage::getSingleton("core/session")->addError("Cart has Special Product you can not add another");
        //  return;
        // }
        $quote = Mage::getModel('checkout/cart')->getQuote();
        foreach ($quote->getAllItems() as $item) {
            $productId = $item->getProductId();
            if($productId==31588){
                Mage::throwException("Cart has Special Product you can not add another");
            }
        }

    }
}
?>

[Aveeva]

@Sunil Patel    After long googling, getting some relevant information, now restricted products not added to cart also not adding if no products available in cart, i know finally logic working but still error, can i get help, 

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/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) {

        $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();
            // $productId = $observer->getEvent()->getProduct()->getId();
            if($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>

Can i get help?