lib/moped/protocol/get_more.rb

      def failure_exception(reply)
        if reply.cursor_not_found?
          Errors::CursorNotFound.new(self, cursor_id)
        else
          Errors::QueryFailure.new(self, reply.documents.first)
        end
      end

module Mongo
  module Protocol
    class Reply
      def cursor_not_found?
        flags.include?(:cursor_not_found)
      end
    end
  end
end

module Mongo
  class Cursor

    def fail_cursor_not_found
      if @initial_result.replies.last && @initial_result.replies.last.cursor_not_found?
        fail Mongo::Error::OperationFailure
      end
    end

    def more?
      fail_cursor_not_found
      @cursor_id != 0
    end
  end
end