redis/redis-rb · error · ArgumentError

wrong number of arguments (given #{args.size + 2}, expected

Error message

wrong number of arguments (given #{args.size + 2}, expected 2, 5 or 6)

What it means

Error "wrong number of arguments (given #{args.size + 2}, expected 2, 5 or 6)" thrown in redis/redis-rb.

Source

Thrown at lib/redis/commands/streams.rb:441

      # @param key      [String]  the stream key
      # @param group    [String]  the consumer group name
      # @param start    [String]  start first entry id of range
      # @param end      [String]  end   last entry id of range
      # @param count    [Integer] count the number of entries as limit
      # @param consumer [String]  the consumer name
      #
      # @option opts [Integer] :idle       pending message minimum idle time in milliseconds
      #
      # @return [Hash]        the summary of pending entries
      # @return [Array<Hash>] the pending entries details if options were specified
      def xpending(key, group, *args, idle: nil)
        command_args = [:xpending, key, group]
        command_args << 'IDLE' << Integer(idle) if idle
        case args.size
        when 0, 3, 4
          command_args.concat(args)
        else
          raise ArgumentError, "wrong number of arguments (given #{args.size + 2}, expected 2, 5 or 6)"
        end

        summary_needed = args.empty?
        blk = summary_needed ? HashifyStreamPendings : HashifyStreamPendingDetails
        send_command(command_args, &blk)
      end

      private

      def _xread(args, keys, ids, blocking_timeout_msec)
        keys = keys.is_a?(Array) ? keys : [keys]
        ids = ids.is_a?(Array) ? ids : [ids]
        args << 'STREAMS'
        args.concat(keys)
        args.concat(ids)

        if blocking_timeout_msec.nil?
          send_command(args, &HashifyStreams)

View on GitHub (pinned to 2ba9010b91)

Solutions

1. Call the method with 2, 5 or 6 total arguments as documented; the given count is not supported.
2. Check the method signature and remove or add arguments to match one of the allowed arities.

When it happens

Trigger: Thrown at lib/redis/commands/streams.rb:441 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of redis/redis-rb@2ba9010b91 (2026-08-23). Data as JSON: /api/errors/8bd6f185858022b3. Report an issue: GitHub.