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							class I18nVariable
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							  include Mongoid::Document
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							  include Mongoid::Timestamps
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							  field :key
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							  field :document_class, :type => String
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							  field :parent_id, :type => BSON::ObjectId, :index => true
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							  belongs_to :language_value, polymorphic: true
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							  def method_missing(field)
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							    self[field]
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							  end
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							end
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