activerecord/test/models/book.rb


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class Book < ActiveRecord::Base
  has_many :authors

  has_many :citations, :foreign_key => 'book1_id'
  has_many :references, -> { distinct }, through: :citations, source: :reference_of

  has_many :subscriptions
  has_many :subscribers, through: :subscriptions

  enum status: [:proposed, :written, :published]
end