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class Instance < ActiveRecord::Base has_and_belongs_to_many :dependances, :class_name => 'Instance', :join_table => 'dependances_instances', :foreign_key => 'instance_id', :association_foreign_key => 'dependance_id' has_and_belongs_to_many :parents, :class_name => 'Instance', :join_table => 'dependances_instances', :foreign_key => 'dependance_id', :association_foreign_key => 'instance_id' end