Execute code after order has been confirmed in Magento 2

Question

Hi fellow programmers,

I would like to know how I can hook in to execute code after a certain action in Magento 2 has been done. As we're running a custom warehouse system, I'd like to reserve a customer's products after an order has been confirmed, but I have no clue as to how to do that.

I've looked in to overriding certain functions using plugins, but that seems a bit redundant as I don't want to copy the entire function body just to execute my own code afterwards.

I've read something about the special "after", "before" plugin functions you can specify, but I don't know how to implement those.

Is there another way or can I use the "before" and "after" plugin functions? If so, can someone point me towards a good resource that explains just that?

Thanks in advance!

Answer 1

You can use observer to run your codes after each action. And in your case, you can use sales_order_save_after to perform your task. Let's say, if you want to perform codes after order status changed to Processing, we can write the following codes:

public function execute(\Magento\Framework\Event\Observer $observer)
{
    $order = $observer->getEvent()->getOrder();
    $status = $order->getStatus();
    if ($status == "processing"){
        //do your codes
    }
    return $this;
}

I assume you know how to create an observer. If not, you can still refer to official documentation and refer to my codes above.