public function addRole($role, $expire_time = null)
{
if (!($user_id = $this->id())) {
throw new \Exception('Cannot add role to unsaved user');
}
if ($this->hasRole($role)) {
return true;
}
$role = Role::findByName($role);
if (!$role) {
throw new \Exception('Invalid role name');
}
$user_role = new User_Role();
$user_role->setProp(array('user_id' => $user_id, 'role_id' => $role->id(), 'expire_time' => $expire_time));
if ($saved = $user_role->save()) {
$this->roles = null;
}
return $saved;
}
