gistfile1.rbx

    def rating(*args)
      options = args.extract_options!
      category = options.delete(:category)
      as_float = options.delete(:as_float)
      certified = options.delete(:certified)
      user_or_ip = options.delete(:user) || options.delete(:ip)

      if user_or_ip && Rating.instance_methods.include?('user')
        options[:conditions] = ["user_id = ?", user_or_ip.id]
      elsif user_or_ip
        options[:conditions] = ["ip = ?", user_or_ip]
      end

      unless category.nil?
        if options[:conditions]
          options[:conditions][0] += " AND category = ?"
          options[:conditions] << category.to_s
        else
          options[:conditions] = ["category = ?", category.to_s]
        end
      end

      selected_ratings = certified ? ratings : ratings.certified
      if (rating = selected_ratings.average(:value, options))
        as_float ? rating : rating.round
      else
        as_float ? 0.0 : Integer(0)
      end
    end