def photos=(values)
      @photos = values.map do |photo|
        photo.map do |photo_size_attrs|
          PhotoSize.new(photo_size_attrs)
        end
      end
    end
def photos=(values)
      @photos = values.map do |photo|
        photo.map do |photo_size_attrs|
          PhotoSize.new(photo_size_attrs)
        end
      end
    end
Assign Array of Array of PhotoSize

 @param values [Array<Array<PhotoSize>>]