Save custom data to ('checktout/session') when product added to cart and remove when removed

[paganini]

So i need to add custom data for each product when customer adds it to card and remove it when customer removes from cart.
What i have done so far was creating observer that fires up when customer adds product to cart, but it doesnt save my data in global ('checkout/session'). In observer i can see my custom data saved. 
This is the code in observer:

        $quoteId = Mage::getSingleton('checkout/session')->getQuote()->getEntityId();
        $quote = Mage::getModel('sales/quote')->load($quoteId);

        $carDetails = Mage::getSingleton('core/session')->getCarDetails();
        if(empty($carDetails)){
            $carDetails = 'No Car in Search';
        }

        $quoteItems = $quote->getAllItems();

        foreach ($quoteItems as $quoteItem){

            $product = $quoteItem->getProduct();

            $quoteItems = $product->setCarDetails($carDetails);

            echo'<pre>';print_r($product->getId());
            echo'<pre>';print_r($product->getCarId());die();
        }

Any help or suggestion would be greatly appreciated. 
If someone knows better way of doing this, also greatly appreciated.

p.s. i need to save this data later on as extra or note to Invoice or Order.

[Sanjay Jethva · Accepted solution]

Hello @paganini 

Please follow the below steps:

1. Create config.xml file at app/code/local/Vendor/Extension/etc/ folder
   

   <?xml version="1.0" encoding="UTF-8"?>
   <config>
       <modules>
           <Vendor_Extension>
               <version>1.0.0</version>
           </Vendor_Extension>
       </modules>
       <global>
           <models>
               <extension>
                   <class>Vendor_Extension_Model</class>
               </extension>
           </models>
           <events>
               <checkout_cart_product_add_after>
                   <observers>
                       <Vendor_Extension_Model_Observer>
                           <type>singleton</type>
                           <class>Vendor_Extension_Model_Observer</class>
                           <method>checkout_cart_product_add_after</method>
                       </Vendor_Extension_Model_Observer>
                   </observers>
               </checkout_cart_product_add_after>
   
               <sales_model_service_quote_submit_before>
                   <observers>
                       <Vendor_Extension_Model_Observer_Set_Order>
                           <type>singleton</type>
                           <class>Vendor_Extension_Model_Observer</class>
                           <method>setAdditionalDataToOrder</method>
                       </Vendor_Extension_Model_Observer_Set_Order>
                   </observers>
               </sales_model_service_quote_submit_before>
           </events>
       </global>
   </config>

2. Create Observer.php file at app/code/local/Vendor/Extension/Model/ folder
   

   <?php
   
   class Vendor_Extension_Model_Observer
   {
       public function checkout_cart_product_add_after($observer)
       {
           $event = $observer->getEvent();
           $quoteItem = $event->getQuoteItem();
   
           $messageOption = array(
               'label' => 'Message',
               'option_value' => 'Custom Value',
               'value' => 'Custom Value',
               'print_value' => 'Custom Value',
           );
   
           $value = array('message' => $messageOption);
           $value = serialize($value);
           $quoteItem->addOption(array('code' => 'additional_options', 'product_id' => $quoteItem->getProductId(), 'value' => $value));
       }
   
       public function setAdditionalDataToOrder($observer)
       {
           try {
               $quote = $observer->getEvent()->getQuote();
               $order = $observer->getEvent()->getOrder();
               $quoteItems = [];
   
               foreach ($quote->getAllVisibleItems() as $quoteItem) {
                   $quoteItems[$quoteItem->getId()] = $quoteItem;
               }
   
               foreach ($order->getAllVisibleItems() as $orderItem) {
   
                   $quoteItemId = $orderItem->getQuoteItemId();
                   $quoteItem = $quoteItems[$quoteItemId];
   
                   $additionalOptions = $quoteItem->getOptionByCode('additional_options');
   
                   if (count($additionalOptions) > 0) {
                       $options = $orderItem->getProductOptions();
                       $options['additional_options'] = unserialize($additionalOptions->getValue());
                       $orderItem->setProductOptions($options);
                   }
   
               }
           } catch (\Exception $e) {
               Mage::log($e->getMessage());
           }
       }
   }

I hope it helps.

[paganini]

Thank you very much, this was exactly what i was looking for!
You saved the day!