Graviy Forms - gform_user_registration_update_user_id - gravity-forms-plugin

Question

This filter can be used to override which user is used to populate the form and updated when the form is submitted.
Case:
Using gravity forms to update another user, update user base on Email field in another form, not currently logged.
gform_user_registration_update_user_id
We create form (form id 12) with 2 fields, email (field id 1) and userid (field id 2), we use email (field id 1) to find user ID and save it in (field id 2) to pass to form (form id 8) to override user ID in it.
add to theme functions.php
add_filter( 'gform_pre_submission_12', function( $form ) {
$email = rgpost( 'input_1' );
$user = get_user_by( 'email', $email );
$userId = $user->ID;
$_POST['input_2'] = $userId;
} );
We also set Regitration Gravity Forms add-on in (form id 8) to Update mode.
So now we have user ID and need to pass it to (form id 8), so we go to (form id 12) Settings - Confirmation and choose Redirect and place in Redirect URL path to form (form id 8), Redirect Query String checked and placed userid={userid:2}
So after (form id 12) submited we redirect to (form id 8) with userid=ID in url string, like:
http://example.com/form8&userid=3
Now we need to recieve userid on form id 8, we get it with rgget from url path since it already was added to it from redirect from form id 12
add to theme functions.php
add_filter( 'gform_user_registration_update_user_id_8', 'override_user_id', 10, 4 );
function override_user_id( $user_id, $entry, $form, $feed ) {
$user_id = rgget( 'userid' );
return $user_id;
}
Also it changes user ID to update right profile on submit, with override user ID.
Thanks to gravity support i know how and what ^) best support ever. Hope it helps other people.