Why are discounts assigned to a certain group of users not available to users who got into this group through the Bitrix API?

Question

1C-Bitrix

Good evening!
Through the admin panel, I assign the “Professionals Club” group to the user.


I see discounts:


If I add via the API:

$dbGroup = \Bitrix\Main\UserGroupTable::getList(
                array(
                'filter' => array("USER_ID" => $USER->GetID(), "GROUP_ID" => 8)
                )
            );
            $arGroups = $dbGroup->FetchAll();

            if (empty($arGroups) && $arGroups[0]["GROUP_ID"] !== 8) {
                \Bitrix\Main\UserGroupTable::add(
                 array(
                     'USER_ID' => $USER->GetID(),
                     'GROUP_ID' => 8,
                 )
                );

I don't see anything, even after reloading the page. If I click on the "Exit" button, and then log back in, discounts appear.
Logging out and re-authorizing is inconvenient, it is necessary that discounts appear immediately after assigning a group to a user.

Answer 1

If I click on the "Exit" button, and then log back in, discounts appear.

This is the answer. Roughly speaking, the user's groups are always those in which he was at the entrance (by the way, this is done almost everywhere where there are groups).
In your case, the easiest way is to re-login the user after adding it.