public function getFieldInUse($groupField, $type = 'all', array $options = [])
{
$defaults = ['group' => $groupField, 'order' => [$this->displayField() => 'ASC']];
if ($type === 'list') {
$defaults['fields'] = ['' . $this->primaryKey(), '' . $this->displayField()];
}
$options += $defaults;
return $this->find($type, $options);
}