Update an order custom field after order complete in Craft 3

Question

I am trying to update an order's custom field after order complete. I set it like this in my plugin:

Event::on(Order::class, Order::EVENT_AFTER_COMPLETE_ORDER, function(Event $e) {
        $order = $e->sender;
        $order->setFieldValue("customFieldHandle", "My value");
    });

But it is not working. I guess I used the wrong method to do it.

Answer 1

What I wrote is correct. I debugged it, and I had a problem in another place where the order did not get completed in the first place. silly me LOL. So my answer is:

Event::on(Order::class, Order::EVENT_AFTER_COMPLETE_ORDER, function(Event $e) {
    $order = $e->sender;
    $order->setFieldValue("customFieldHandle", "My value");
});