Add field/s to repeater via API

[dotnetic]

I want to create a repeater field via API and add fields to it.

I read that there is a property repeaterFields, but when I try to add a field it does not appear in the ProcessWire backend.

I put this code into my tracy console:

$fields->delete($fields->get('quiz_answers'));
$fields->delete($fields->get('quiz_correct_answer'));

$repeater = new Field;
$repeater->type = wire('modules')->get('FieldtypeRepeater');
$repeater->name = 'quiz_answers';
$repeater->label = 'Answer';
$repeater->repeaterCollapse = 3;
$repeater->required = true;
$repeater->repeaterAddLabel = 'Neue Antwort hinzufügen';
// $field->parent_id = wire('pages')->get("name=for-field-{$field->id}")->id;
// $field->template_id = $template->id;
$repeater->save();

$checkbox = new Field;
$checkbox->type = $this->modules->get("FieldtypeCheckbox");
$checkbox->name = "quiz_correct_answer";
$checkbox->label ="This is the correct answer";
$checkbox->tags = 'quiz';
$checkbox->save();

//add fields to repeaterFields
$repeaterFieldsArray = array();
$repeaterFieldsArray[] = $checkbox->id;
$repeater->repeaterFields = $repeaterFieldsArray;
$repeater->save();

But when I go and edit the repeater field 'quiz_answers', no field appears at details -> repeater fields.

What is the correct way to add one ore more fields to the repeater via API?

Maybe @teppo or @adrian could help me out with this, as you both seem to have some experience with repeater fields?

Parts of my code are stolen, copied inspired by https://gist.github.com/teppokoivula/8889040 and https://github.com/adrianbj/ProcessAdminActions/blob/master/actions/PageTableToRepeaterMatrix.action.php#L227

[adrian]

Take a read through this thread: https://processwire.com/talk/topic/5397-assigning-fields-to-repeaters-with-the-api/

I think the function by @thetuningspoon does what you need, but please read my comment afterwards - not sure if that change was incorporated or not.