How to Create and Use Custom User Input Attributes for Products in Magento Quotes and Orders?

Magento - Quote/order product item attribute based on user input

Introduction

Magento allows for custom attributes that are not displayed on product pages or attribute sets, but can be saved to quote/order items. This article will guide you through creating such an attribute, adding a frontend form element for user input, saving its value to quote/order items, and displaying it on order and invoice templates.

Steps to Create the Attribute:

1. Add Event Observer:

   • Use catalog_product_load_after event to add the form element to the product page.
   • Add the custom options to the additional_options option of the product model.

2. Save to Quote Item:

   • Use sales_convert_quote_item_to_order_item event to copy the options from quote item to order item.

3. Display on Order Template:

   • Modify the order view template (e.g., app/design/frontend/base/default/sales/order/view.phtml) to display the custom attribute.

Additional Features:

• Validation: Validate user input on the frontend using PHP code or a JS library.
• Template Control: Use a custom template to generate the HTML for the form element or control how the value is displayed on the frontend.
• Filtering Collections: Filter order collections using $collection->addFieldToFilter('additional_options.label', array('eq' => 'My Label'));.

Important Notes:

• Additional options are not product attributes or custom options.
• They are stored in the additional_options option field.
• Observer events are used to handle the process of adding, saving, and displaying the custom attribute.
• Translating the label and value of the custom attribute requires custom code or template modifications.

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