Orbit/app/models/asset.rb

class Asset

  include Mongoid::Document
  include Mongoid::Timestamps

  mount_uploader :data, FileAssetUploader

  field :filename
  field :description

  has_one :title, :class_name => "I18nVariable", :as => :language_value, :autosave => true, :dependent => :destroy
  has_one :description, :class_name => "I18nVariable", :as => :language_value, :autosave => true, :dependent => :destroy
  
  validates_presence_of :title, :data, :description

  belongs_to :asset_category
  belongs_to :assetable, polymorphic: true
  has_and_belongs_to_many :tags, :class_name => "AssetTag"

  before_save :set_key

  def title
    @title ||= I18nVariable.first(:conditions => {:key => 'title', :language_value_id => self.id, :language_value_type => self.class}) rescue nil
  end

  def description
    @description ||= I18nVariable.first(:conditions => {:key => 'description', :language_value_id => self.id, :language_value_type => self.class}) rescue nil
  end

  def sorted_tags
    tags.order_by(I18n.locale, :asc)
  end

  protected
  
  def set_key
    if title && title.new_record?
      title.key = 'title'
    end
    if description && description.new_record?
      description.key = 'description'
    end
  end
  
end