Fill out custom field with used coupon code WooCommerce

Question

Right now I'm working with a mailchimp plugin that needs a custom field for validating/segmenting.

For this segment I want to check what kind of coupon is used. So I scavenged the following code that should fill my custom field with the used coupons:

add_action( 'woocommerce_checkout_update_order_meta', 
'my_custom_checkout_field_update_order_meta' );

function my_custom_checkout_field_update_order_meta( $order_id ) {
if ( empty( $_POST['my_field_name'] ) ) {
    $coupons = $order->get_used_coupons();
    update_post_meta( $order_id, 'my_field_name', $coupons);
}
}

Sadly this will only crash my site.

Any help would be greatly appreciated.

I cannot, however I figured something out. changing: `$coupons = $order->get_used_coupons();` To: `$coupons = $order_id->get_used_coupons();` keeps it from crashing but will still not fill out my field. This is probably due the fact that $order was never defined. — Tristan .L, Mar 02 '16 at 14:14

score 0 · Accepted Answer · answered Mar 02 '16 at 14:14

0

There are several problems with your code:

You're not validating if the field has any information, so you need to check if $_POST has the my_field_name key
You need to load the $order variable in order to get the used coupons.
What happens when there's a my_field_value? Do you store it?

Here's the modified code:

add_action( 'woocommerce_checkout_update_order_meta', 
'my_custom_checkout_field_update_order_meta' );

function my_custom_checkout_field_update_order_meta( $order_id, $posted ) {
  if ( isset($_POST['my_field_name']) && empty( $_POST['my_field_name'])) {
    $order = new WC_Order( $order_id );
    $coupons = $order->get_used_coupons();
    update_post_meta( $order_id, 'my_field_name', $coupons);
  }

}

answered Mar 02 '16 at 14:14

Skatox

4,237
12
42
47

Okay your code kinda works, however it wil return 'array' as coupon field and the value is never displayed in the actual field on the front-end. Which is where I think i need it to be able to let my plugin check if the custom field contains certain coupon codes. – Tristan .L Mar 02 '16 at 14:29
by replacing `$coupons = $order->get_used_coupons();` with `foreach( $order->get_used_coupons() as $coupon) { $coupons .= $coupon.'\n'; }` I no longer get 'array' in my field but the actual coupon. So that part is solved.. – Tristan .L Mar 02 '16 at 15:09
Yes, you need to validate that as well. Also remember that you can store arrays in the post meta – Skatox Mar 02 '16 at 15:10
It's better to do explode($order->get_used_coupons(),'\n') that the foreach – Skatox Mar 02 '16 at 15:11
Thank you! The remaining problems I have, have nothing to do with the code but with the plugin it seems. Problem solved. – Tristan .L Mar 02 '16 at 15:24

Fill out custom field with used coupon code WooCommerce

1 Answers1

Linked