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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]
enum read_status: {unread: 0, reading: 2, read: 3}
end
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