public function create($permissionName, $readableName = null)
{
if (!is_null($this->findByName($permissionName))) {
throw new PermissionExistsException('The permission ' . $permissionName . ' already exists');
// TODO: add translation support
}
// Do we have a display_name set?
$readableName = is_null($readableName) ? $permissionName : $readableName;
return $permission = $this->model->create(['name' => $permissionName, 'readable_name' => $readableName]);
}