Get Customer from Order inside Observer function

Question

I need to make a custom customer attribute available as email template variable.

I created the following Observer, that executes just fine.

use Magento\Framework\Event\ObserverInterface;

class AddExtraDataToTransport implements ObserverInterface
{
  public function execute(\Magento\Framework\Event\Observer $observer)
  {
    $transport = $observer->getEvent()->getTransport();
    $order = $transport->getOrder();

    $transport->addData([
       'test' => 'this is a test',
    ]);
  }
}

How would I get ahold of the order's Customer here?

I tried using $order->getCustomer() which returns null. I expected it to return the Customer Object.

After reading the code of Order I expected this to work.

\Magento\Sales\Model\Order Line 46:

* @method \Magento\Customer\Model\Customer getCustomer()

Can anyone point me in the right direction?

Answer 1

This works:

use Magento\Framework\Event\ObserverInterface;

class AddExtraDataToTransport implements ObserverInterface
{
  public function __construct(
    \Magento\Customer\Api\CustomerRepositoryInterface $customerRepositoryInterface
  ){
    $this->_customerRepositoryInterface = $customerRepositoryInterface;
  }

  public function execute(\Magento\Framework\Event\Observer $observer)
  {
    $transport = $observer->getEvent()->getTransport();
    $customer = $this->_customerRepositoryInterface->getById($transport->getOrder()->GetCustomerId());

    $transport->addData([
       'attr' => $customer->getCustomAttribute('attr')->getValue()
    ]);
  }
}

Not sure if this is the easiest way though. Comments are appreciated!