You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: reply.rb
    path of file: ./repos/mongo-ruby-driver/lib/mongo/protocol
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
# rubocop:todo all

# Copyright (C) 2014-2020 MongoDB Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to i
    
        def initialize(documents, cursor_id, starting_from)
          @documents = documents
          @cursor_id = cursor_id
          @starting_from = starting_from
        end

        # @return [ Array<BSON::Document> ] documents The documents.
        attr_reader :documents

        # @return [ Integer ] cursor_id The cursor id.
        attr_reader :cursor_id

        # @return [ Integer ] starting_from The starting point in the cursor.
        attr_reader :starting_from

        # Get the upconverted command.
        #
        # @example Get the command.
        #   upconverter.command
        #
        # @return [ BSON::Document ] The command.
        #
        # @since 2.1.0
        def command
          command? ? op_command : find_command
        end

        private

        def batch_field
          starting_from > 0 ? NEXT_BATCH : FIRST_BATCH
        end

        def command?
          !documents.empty? && documents.first.key?(Operation::Result::OK)
        end

        def find_command
          document = BSON::Document.new
          cursor_document = BSON::Document.new
          cursor_document.store(ID, cursor_id)
          cursor_document.store(batch_field, documents)
          document.store(Operation::Result::OK, 1)
          document.store(CURSOR, cursor_document)
          document
        end

        def op_command
          documents.first
        end
      end

      Registry.register(OP_CODE, self)
    end
  end
end