<?php
class Group extends AppModel {

  var $hasMany =
    array('GroupOption',
	  'Membership',
	  );

  var $knows = 
    array('User',
	  'Site',
	  );

  static $current_group_ids;
  function currentGroupIds() {
    if (empty(self::$current_group_ids))
      self::$current_group_ids = $this->groupIds();

    if (empty(self::$current_group_ids))
      // We must force a stop here, since this is typically
      // called very early on, and so will cause a recursive
      // crash as we try to render the internal error and
      // again stumble on this problem.
      $this->INTERNAL_ERROR('INVALID MEMBERSHIP', 0, true);

    return self::$current_group_ids;
  }

  function groupIds($user_id = null, $site_id = null) {
    if (empty($user_id))
      $user_id = $this->User->currentUserId();
    if (empty($site_id))
      $site_id = $this->Site->currentSiteId();

    return $this->Membership->memberGroups($user_id, $site_id);
  }

}