Magento Shopping Cart Extension

Question

I need to expand my Magento shopping cart to include an extra step for the store locator. I understand that I need to overwrite the main OnePage controller ( Mage_Checkout_OnepageController ) and blocks ( Mage_Checkout_Block_Onepage ), but what needs to be done to track additional information (for example, user selected parameters from my user step).

Answer 1

To get the whole solution, you need to follow a few steps.

First, create a new module. Use ModuleCreator if you want.

Then write setup script in your module to add new fields to the Magento attribute structure, for example.

  $setup = new Mage_Sales_Model_Mysql4_Setup('core_setup'); $setup->startSetup(); $setup->addAttribute('quote', 'my_attribute', array('type' => 'varchar', 'visible' => false, 'required' => false)); $setup->addAttribute('order', 'my_attribute', array('type' => 'varchar', 'visible' => false, 'required' => false)); $setup->addAttribute('invoice', 'my_attribute', array('type' => 'varchar', 'visible' => false, 'required' => false)); $setup->addAttribute('creditmemo', 'my_attribute', array('type' => 'varchar', 'visible' => false, 'required' => false)); 

Note the use of Mage_Sales_Model_Mysql4_Setup to add fields to the respective sales_flat_quote and sales_flat_order .

Now add the following values ​​to the config.xml file of your module:

 <global> <fieldsets> <sales_convert_quote> <my_attribute> <to_order>*</to_order> </my_attribute> </sales_convert_quote> <sales_convert_order> <my_attribute> <to_cm>*</to_cm> <to_invoice>*</to_invoice> </my_attribute> </sales_convert_order> </fieldsets> 

This will instruct Magento to copy the values ​​of your custom field from the billing quote and credit_memo, etc.

Then in your custom block / controller code, you can use Magento magic getters and seters to save the values.

 $oQuote = Mage::getSingleton('checkout/session')->getQuote(); $oQuote->setMyAttribute('some_value'); $oQuote->save(); 

You should see a new column and value stored in sales_flat_quote . Then, as soon as the client completes the check, the same value should be stored in sales_flat_order .

Please note that the above code can be extended to work quote_item and order_item , just changing the quote to quote_item , etc., however, if you want to save the attribute values ​​set on your products, then additional work is required.

Insert a new XML block into your config.xml (again inside the global node):

  <sales> <quote> <item> <product_attributes> <my_attribute /> </product_attributes> </item> </quote> </sales> 

Where my_attribute is the attribute code in the product model. This will make my_attribute available to the related product so that you can access it through

 $oQuoteItem->getProduct()->getMyAttribute() 

without doing the full Mage::getModel('catalog/product')->load($oQuoteItem->getProductId()) . It is much more efficient.

Then you need an observer to copy the values ​​from the product object to the quote_item object. So declare your observer in config.xml:

  <events> <sales_quote_item_set_product> <observers> <quoteitem_set_custom_data> <type>singleton</type> <class>mymodule/observer</class> <method>setCustomDataOnQuoteItem</method> </quoteitem_set_custom_data> </observers> </sales_quote_item_set_product> <events> 

and write the code in your observer class as follows:

 public function setCustomDataOnQuoteItem($oObserver){ $oProduct = $oObserver->getProduct(); $oQuoteItem = $oObserver->getQuoteItem(); foreach(array('my_attribute') as $vAttributeCode){ $oQuoteItem->setData($vAttributeCode,$oProduct->getData($vAttributeCode)); } } 

Answer 2

Here is the full working module .. its (almost) the same as the above Jonathan code. You will find it here: https://bitbucket.org/vovsky/adding-custom-product-attribute-to-quote-and-order-items-in/

And a full explanation of each step is here: http://www.atwix.com/magento/custom-product-attribute-quote-order-item/