How to remove the error "Maximum function nesting level of '256' reached, aborting!"?

Question

1C-Bitrix

At the "Save order" event, I try to change the status of the order, I write the code:

$order = $event->getParameter("ENTITY");
$order->setField("STATUS_ID", "T");
$order->save();

But the error "Maximum function nesting level of '256' reached, aborting!"
I increased the nesting to 2000, but it didn't help.
Tell me what's wrong?

Answer 1

You are entering an endless cycle of updates. At the entrance to the function, check that the desired status is already set.

Answer 2

No need to call $order->save();

public function changeStatusOnOrderCreate(\Bitrix\Main\Event $event)
{
    /** @var \Bitrix\Sale\Order $order */
    $order = $event->getParameter("ENTITY");
    $order->setField("STATUS_ID", "T");

    $event->addResult(
        new Main\EventResult(
            Main\EventResult::SUCCESS, $order
        )
    );
}