Merge in from pre_0.1 branch

git-svn-id: file:///svn-source/pmgr/trunk/site@847 97e9348a-65ac-dc4b-aefc-98561f571b83

models/group.php

@@ -0,0 +1,38 @@
+<?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);
+  }
+
+}