/**
* Checks if a user is in a group or groups
* @param string|array $groups group name or an array of possible group names
* @return boolean
*/
public function inGroup($group)
{
if (!is_array($group)) {
$group = array($group);
}
$gg = Set::extract($this->groups()->get(), '*.attributes.name');
return count(array_intersect($gg, $group)) > 0;
}