Add extra meta for orders in Woocommerce

Question

I'm creating a custom plugin for my website.

In some part of this plugin I need to store extra meta in wp_postmeta for each orders.

I added this in my plugin's class:

add_action ('woocommerce_before_checkout_process', array( &$this, 'add_item_meta', 10, 2) ); 

And this is add_item_meta() function:

function add_item_meta( $item_id, $values ) {   wc_add_order_item_meta($item_id, '_has_event', 'yes' ); } 

This function is not complete, but nothing happens with this codes; I think I need to use another hook but I can't find a proper one.

Does anyone know anything about this?

I also have another problem with $item_id: this is woocommerce global variable but I can't see it in my plugin!

I mean I don't have access to this variable from my plugin or something like this!

Answer 1

The 2018 way:

Built on Guido W.P. answer you can use instead woocommerce_checkout_create_order action hook in a more lighter and effective version code (using WC 3+ CRUD methods):

add_action('woocommerce_checkout_create_order', 'before_checkout_create_order', 20, 2); function before_checkout_create_order( $order, $data ) {     $order->update_meta_data( '_custom_meta_key', 'value' ); } 

Code goes in function.php file of your active child theme (or active theme).

Tested and works in WooCommerce 3+ (only).

---

SOME EXPLANATIONS:

The woocommerce_checkout_create_order action hook is just one step before saving the order data. See below in an extract of the WC_Checkout create_order() method (with both hooks):

/**  * Action hook to adjust order before save.  * @since 3.0.0  */ do_action( 'woocommerce_checkout_create_order', $order, $data );  // Save the order. $order_id = $order->save();  do_action( 'woocommerce_checkout_update_order_meta', $order_id, $data );  return $order_id; 

Why using woocommerce_checkout_create_order instead?:

• Because You don't need to use $order = wc_get_order( $order_id ); as you already got $order as an argument in the hooked function.
• You don't need to use $order->save(); as this will be done just after anyway (see the source code)
• This hook has been released since WooCommerce version 3 and it's made for the same purpose, allowing to use all available WC_Order methods.

So this just works with a single line of code inside the function.

Answer 2

Building on Mo Saeedi answer, I believe this snippet is more in line with the new CRUD approach introduced by WooCommerce 3.0:

add_action('woocommerce_checkout_update_order_meta',function( $order_id, $posted ) {     $order = wc_get_order( $order_id );     $order->update_meta_data( 'my_custom_meta_key', 'my data' );     $order->save(); } , 10, 2); 

See also this threads on the WordPress forums:

• Oh CRUD! Custom Meta to order from cart
• What is the correct way to update meta fields in Woocommerce?