Save meta value when WooCommerce order status is completed - php

Question

I made a code to save a value based on a meta key when a certain product is purchased (order status = completed).
I have written the code below to complete this task. However, the meta data does not appear to be saved? Any advice?
add_action( 'woocommerce_order_status_completed', 'wpglorify_change_role_on_purchase2' );
function wpglorify_change_role_on_purchase2( $order_id ) {
// get order object and items
$order = new WC_Order( $order_id );
$items = $order->get_items();
$user_is= $user->ID;
$meta_key = get_field("field");
$field = get_user_meta($user_is, $meta_key);
$meta_value = 5;
$product_id = 1289;
foreach ( $items as $item ) {
if( $product_id == $item['product_id'] && $order->user_id ) {
$user = new WP_User( $order->user_id );
update_user_meta($user_is, $field, $meta_value, '');
}
}
}

Answer 1

Your code contains some mistakes:
get_field() is a ACF function, and doesn't seem to apply here
You're using $user->ID; but $user is undefined
Furthermore, it is important to determine whether you want to update user meta or post meta data
1) To update user meta you can use:
// Update user meta
function action_woocommerce_order_status_completed( $order_id, $order ) {
// Product IDs
$product_id = 1289;
// Meta data
$meta_value = 5;
$meta_key = 'my_meta_key';
// Is a order
if ( is_a( $order, 'WC_Order' ) ) {
// Getting the user ID
$user_id = $order->get_user_id();
// User ID exists
if ( $user_id >= 1 ) {
// Loop through order items
foreach ( $order->get_items() as $key => $item ) {
// Compare
if ( $item->get_product_id() == $product_id ) {
// Update user meta
update_user_meta( $user_id, $meta_key, $meta_value );
// Break loop
break;
}
}
}
}
}
add_action( 'woocommerce_order_status_completed', 'action_woocommerce_order_status_completed', 10, 2 );
2) To update post meta you can use:
// Update post meta
function action_woocommerce_order_status_completed( $order_id, $order ) {
// Product IDs
$product_id = 1289;
// Meta data
$meta_value = 5;
$meta_key = 'my_meta_key';
// Is a order
if ( is_a( $order, 'WC_Order' ) ) {
// Loop through order items
foreach ( $order->get_items() as $key => $item ) {
// Compare
if ( $item->get_product_id() == $product_id ) {
// Add the meta data
$order->update_meta_data( $meta_key, $meta_value );
// Save
$order->save();
/** OR the older way **/
// update_post_meta( $order_id, $meta_key, $meta_value );
// Break loop
break;
}
}
}
}
add_action( 'woocommerce_order_status_completed', 'action_woocommerce_order_status_completed', 10, 2 );