--- /dev/null
+class Membership < ActiveRecord::Base
+ # set_primary_keys *keys - turns on composite key functionality
+ set_primary_keys :user_id, :group_id
+ belongs_to :user
+ belongs_to :group
+ has_many :statuses, :class_name => 'MembershipStatus', :foreign_key => [:user_id, :group_id]
+end
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