public function formatAccessRule(Model\AccessRule $model)
{
$data = ['id' => $model->getId(), 'users' => $model->getUsers()];
if ($group = $model->getGroup()) {
$data['group'] = $group;
}
if ($resources = $model->getResources()) {
$data['resources'] = $resources;
}
return $this->encode($data);
}