How to Replace the Deprecated `woocommerce_add_order_item_meta` Hook?

Deprecated woocommerce_add_order_item_meta Hook: A Modern Replacement

The deprecated woocommerce_add_order_item_meta hook, used to add custom metadata to order items, has raised concerns among developers. Fortunately, WooCommerce has introduced an alternative solution to meet this need.

2017/2018 Solution: Leveraging CRUD Setters and Getters

With the introduction of Woocommerce 3, the CRUD setters and getters methods provide an efficient way to manipulate data in WooCommerce. The recommended replacement hook is:

• woocommerce_checkout_create_order_line_item:

This hook offers access to relevant data, including the order item, cart item key, values, and order object. It allows you to update metadata using the following syntax:

$item->update_meta_data('meta_key', 'meta_value');

Example Implementation:

add_action( 'woocommerce_checkout_create_order_line_item', 'custom_checkout_create_order_line_item', 20, 4 );

function custom_checkout_create_order_line_item( $item, $cart_item_key, $values, $order ) {
    // Get product custom field value
    $custom_field_value = get_post_meta( $item->get_product_id(), '_meta_key', true );

    // Update order item meta
    if ( ! empty( $custom_field_value ) ) {
        $item->update_meta_data( 'meta_key1', $custom_field_value );
    }

    // ...

    // Get cart item custom data and update order item meta
    if ( isset( $values['custom_data'] ) ) {
        $item->update_meta_data( 'meta_key2', $values['custom_data'] );
    }
}

Conclusion:

woocommerce_checkout_create_order_line_item is the preferred alternative to the deprecated woocommerce_add_order_item_meta hook for adding custom metadata to order items. This hook and the CRUD setters and getters methods provide a modern and efficient approach to data manipulation in WooCommerce 3 and beyond.

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