File: citation.rb

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ruby-activerecord-2.3 2.3.14-6
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class Citation < ActiveRecord::Base
  belongs_to :reference_of, :class_name => "Book", :foreign_key => :book2_id

  belongs_to :book1, :class_name => "Book", :foreign_key => :book1_id
  belongs_to :book2, :class_name => "Book", :foreign_key => :book2_id
end