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							class Purchase
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							  include Mongoid::Document
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							  include Mongoid::Timestamps
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							  field :purchase_id
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							  field :title
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							  field :author
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							  field :intro
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							  field :downloaded, :type => Boolean
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							  field :download_date, :type => Date
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							  field :type
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							  field :app_controller
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							  has_many :app_auths
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							end
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