redis/redis-rb · error · ArgumentError

values must not be empty

Error message

values must not be empty

What it means

Error "values must not be empty" thrown in redis/redis-rb.

Source

Thrown at lib/redis/commands/hashes.rb:519

      #
      # The fieldset must exist on the executing connection, otherwise the
      # server replies with a "no such fieldset" error.
      #
      # @note HIMPORT support is experimental: the client API may change in a
      #   future minor release without a major version bump.
      #
      # @example
      #   redis.himport_set("shared:1", "shared", ["alice", "alice@example.com", "25"])
      #     # => "OK"
      #
      # @param [String] key hash key to create or overwrite
      # @param [String] fieldset_name fieldset previously prepared on this connection
      # @param [String, Array<String>] values one or more values, order preserved
      # @return [String] `"OK"`
      # @api experimental
      def himport_set(key, fieldset_name, *values)
        values.flatten!(1)
        raise ArgumentError, "values must not be empty" if values.empty?

        send_command([:himport, "SET", key, fieldset_name].concat(values))
      end

      # Remove +fieldset_name+ from this connection's session. Keys already
      # written through the fieldset are not affected.
      #
      # @note HIMPORT support is experimental: the client API may change in a
      #   future minor release without a major version bump.
      #
      # @param [String] fieldset_name
      # @return [Integer] `1` if the fieldset was removed, `0` if it did not exist
      # @api experimental
      def himport_discard(fieldset_name)
        send_command([:himport, "DISCARD", fieldset_name])
      end

      # Remove all fieldsets from this connection's session.

View on GitHub (pinned to 2ba9010b91)

Solutions

1. Pass at least one field/value pair to the command; do not call it with an empty values list.
2. Check the calling code for an empty array or hash being splatted into the command and guard it with a presence check.

When it happens

Trigger: Thrown at lib/redis/commands/hashes.rb:519 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/14c173fd1f2f8fd1. Report an issue: GitHub.