Saving entries field doesn't work

[JulieVelghe]

Hi all,
I have a question about some custom development I'm doing.
I have a registration form that has an elements integration to create a user. The user has an entry field representing a chosen field of study. The data for that field is on the main site.
The form is on a subsite, and it has a field where the user can select an entry from the main site (being a chosen field of study).

On the initial creating of the user, this field is not getting mapped and remains empty.

I have another form, to modify the user data. I used a custom module, where I checked in the event_after_submission, which field of study was chosen on that form and update the user data. That code works well:

                    if ($form->handle == "formUserData"){
                        $primarySiteId = Craft::$app->sites->primarySite->id;

                        //get the field userCourse and save it to the user's field userCourse
                        $submissionUserCourse = $submission->getFieldValue('userCourse')->siteId($primarySiteId)->one();
                        $submissionUserCourseId = $submissionUserCourse->id;
                        $submissionUserId = $submission->getFieldValue('userProfileId');

                        //find user
                        $user =  \craft\elements\User::find()->id($submissionUserId)->one();
                        $user->setFieldValue('userCourse', $submissionUserCourseId);
                        Craft::$app->elements->saveElement($user);
                    }

I have created another function now to try to map the user course field:

        Event::on(Elements::class, Elements::EVENT_AFTER_SAVE_ELEMENT, function(ElementEvent $event) {
            if ($event->element instanceof \craft\elements\User && !ElementHelper::isDraftOrRevision($event->element)) {

                $user = $event->element;
                $isNewUser = $event->isNew;

                if ($user->can('Admin')) {
                    // leave admins alone
                    return;
                }

                if ($isNewUser && $user->isInGroup('creators')) {
                    // This is a new user
                    $tempcourseid = $_POST['fields']['userCourse'][0];

                    $primarySiteId = Craft::$app->sites->primarySite->id;

                    $submissionUserCourse = \craft\elements\Entry::find()->section('courses')->id($tempcourseid)->siteId($primarySiteId)->one();

                    $submissionUserCourseId = $submissionUserCourse->id;

                    Craft::info('User is new, usercourseid is '.$submissionUserCourseId, __METHOD__);

                    //find user
                    $userel =  \craft\elements\User::find()->id($user->id)->one();
                    $userel->setFieldValue('userCourse', $submissionUserCourseId);
                    $userel->setFieldValue('userProfileIntroduction',$submissionUserCourseId);
                    Craft::$app->elements->saveElement($userel);
                }
            }
        });

This semi works. The field 'userProfileIntroduction', which is a redactor field, gets filled in with the id.

The userCourse field remains empty.

Does anyone have any idea why this doesn't seem to work? As it is basically the same code that is used by the modify function.

[janhenckens]

Does the userCourse field get filled by Formie/Freeform on this submission? (I assume that's what you're using to build the form?)

If yes, then this line should return an element(query?)

$submissionUserCourse = $submission->getFieldValue('userCourse')->siteId($primarySiteId)->one();

I'd try to debug the submissionUserCourse here, through xdebug or logging the result.

[JulieVelghe]

That line gets used by a profile form, to update the user data. That line propably gives an element query, but i'm using the id of that to update the field.
I would think that this code from after the edit (which works):

                        $submissionUserCourse = $submission->getFieldValue('userCourse')->siteId($primarySiteId)->one();
                        $submissionUserCourseId = $submissionUserCourse->id;
                        $user->setFieldValue('userCourse', $submissionUserCourseId);

would be the same as this code from after the creation (which doesn't work):

                        $submissionUserCourse = \craft\elements\Entry::find()->section('courses')->id($tempcourseid)->siteId($primarySiteId)->one();
                        $submissionUserCourseId = $submissionUserCourse->id;
                        $userel->setFieldValue('userCourse', $submissionUserCourseId);

[mmikkel]

When populating relational fields programmatically, you'll need to use an array of element IDs (even if it's just a single ID), i.e.

$userel->setFieldValue('userCourse', [$submissionUserCourseId]);