How to write a value to a custom field when the order status changes?

Question

1C-Bitrix

Hello!

It is necessary to take the order amount and write the value in the user field (USER volume) when changing the order status. To do this, I add the following code to init.php:

\Bitrix\Main\EventManager::getInstance()->addEventHandler('sale', 'OnSaleStatusOrderChange', ['Handler', 'OnSaleStatusOrderChange']);
    
    class Handler {
      function OnSaleStatusOrderChange($event)
      {
        $parameters = $event->getParameters();
        if ($parameters['VALUE'] === 'P')
        {
          /** @var \Bitrix\Sale\Order $order */
          $order = $parameters['ENTITY'];
          /*
           здесь как то нужно записать значение в поле
           */
        }
    
        return new \Bitrix\Main\EventResult(
          \Bitrix\Main\EventResult::SUCCESS
        );
      }
    }

Field type: string. The field itself belongs to the user. Help me to understand

Answer 1

$order->setFields($arFieldsToChange);

Answer 2

Maybe it will be useful for someone, I solved it like this:

\Bitrix\Main\EventManager::getInstance()->addEventHandler('sale', 'OnSaleStatusOrderChange', ['Handler', 'OnSaleStatusOrderChange']);

class Handler {
  function OnSaleStatusOrderChange($event)
  {
    $parameters = $event->getParameters();
    if ($parameters['VALUE'] === 'P')
    {
      /** @var \Bitrix\Sale\Order $order */
      $order = $parameters['ENTITY'];
      $userID = $order->getField("USER_ID"); // получаем ID пользователя
      $orderPrice = $order->getField("PRICE"); // получаем сумму заказа

      //получаем пользовательское поле для записи
      global $USER;

      $filter = Array("ID" => $userID, "ACTIVE"=> "Y");
      $arParams["SELECT"] = array( "UF_BONUS_SUM");

      $rsUsers = CUser::GetList(($by="personal_phone"), ($order="desc"), $filter, $arParams); 
      while ($arUser = $rsUsers->Fetch()) {
         $oldSum = $arUser["UF_BONUS_SUM"];
      }

      $bonusSum = $oldSum + $orderPrice; // сумма заказа + сумма, которая уже записана в пользовательское поле
      $user = new CUser;
      $fields = Array(
        "UF_BONUS_SUM" => $bonusSum,
        );
      $user->Update($userID, $fields); // обновляем поле

      //Bitrix\Main\Diag\Debug::writeToFile(array($order ),"","/log_new.txt");

    }

    return new \Bitrix\Main\EventResult(
      \Bitrix\Main\EventResult::SUCCESS
    );
  }
}