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							class AssetCategory
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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 :display
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							  has_one :i18n_variable, :as => :language_value, :autosave => true, :dependent => :destroy
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							  has_many :assets
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							  def self.from_id(id)
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							    AssetCategory.find(id) rescue nil
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							  end
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							end |