vincey_

class Group < ActiveRecord::Base        acts_as_nested_set        has_many :memberships        has_many :users, :through => :memberships        belongs_to :owner, :class_name => "User"endclass Membership < ActiveRecord::Base        belongs_to :group        belongs_to :userendclass User < ActiveRecord::Base        has_many :memberships        has_many :groups, :through => :membershipsend