code: def put_buffer(filename, content, conn=None):
      
      obj_dict = {PRIMARY_FIELD: filename,
                  CONTENT_FIELD: content,
                  TIMESTAMP_FIELD: time()}
      return put(obj_dict, conn=conn)
docs: helper function for put
      :param filename: <str>
      :param content: <bytes>
      :param conn: <rethinkdb.DefaultConnection>
      :return: <dict>