Fixed and refactored foodcoop/workgroups.

app/models/group.rb

@@ -9,6 +9,8 @@ class Group < ActiveRecord::Base
   validate :last_admin_on_earth, :on => :update
 
   before_destroy :check_last_admin_group
+
+  attr_reader :user_tokens
   
   # Returns true if the given user if is an member of this group.
   def member?(user)
@@ -20,6 +22,10 @@ class Group < ActiveRecord::Base
     User.all(:order => 'nick').reject { |u| users.include?(u) }
   end
 
+  def user_tokens=(ids)
+    self.user_ids = ids.split(",")
+  end
+
   protected
 
   # Check before destroy a group, if this is the last group with admin role