How do I allow a user to edit another users data via module?

Question

I'm attempting to allow a user to edit other users via a front-end form. The "Edit users" permission has been checked in the admin but when I submit the form the data doesn't save. For this example, I'd prefer not to use hidden inputs within the form to manipulate the data.

Event::on(
 User::class,
 User::EVENT_BEFORE_SAVE,
 function (ModelEvent $event) {

    //User id is the id of another user, not the sender.

    $userId = $this->request->getBodyParam('userId');
    $user = Craft::$app->users->getUserById($userId);

    $fieldName = 'exampleTextField';
    $user->setFieldValue($fieldName, 'I want this text to populate exampleTextField');

});

Answer 1

Could you try this at the end of the function::

    $user->setFieldValue($fieldName, 'I want this text to populate exampleTextField')
    // ... more code
    Craft::$app->getElements()->saveElement($user);

Also, I think it's better to use AFTER SAVE rather than BEFORE(It really depends on how your module works)

UPD: Try these variants and also see this question, maybe it will help you

#1

$fields = $user->getFieldValues();

$fields['customHandle'] = 'Custom value';
                    
$user->setFieldValues($fields);

#2

$fields = $user->getSerializedFieldValues();

$fields['customHandle'] = serialize('Custom value');
                    
$user->setFieldValues($fields);

#3

$user->customHandle = 'Custom value';

P.S. By the way, try wrapping the value in an array, maybe that will help you too.

 $user->setFieldValue('userAvatar', [$avatarAssetId]);

UPD2: You have an error in logic. You are trying to save a user (element) that is not a sender. You won't be able to save it in BEFORE/AFTER element save event, as any attempt to save it via:

Craft::$app->getElements()->saveElement($user);

will result in an endless loop. You need to send data to a custom controller and handle the data there as you need. By the way, you will need to check permissions of users manually, if it's necessary.

if ($user->can('editUsers')) {
....
}