# File lib/mongo/grid/fs_bucket.rb, line 107
      def find_one(selector = nil)
        file_info = files_collection.find(selector).first
        return nil unless file_info
        chunks = chunks_collection.find(:files_id => file_info[:_id]).sort(:n => 1)
        Grid::File.new(chunks.to_a, Options::Mapper.transform(file_info, Grid::File::Info::MAPPINGS.invert))
      end