discourse/discourse · error · Discourse::InvalidParameters

All parts must have an etag and a valid part number

Error message

All parts must have an etag and a valid part number

What it means

Error "All parts must have an etag and a valid part number" thrown in discourse/discourse.

Source

Thrown at lib/external_upload_helpers.rb:246

    ).performed!

    external_upload_stub =
      ExternalUploadStub.find_by(unique_identifier: unique_identifier, created_by: current_user)
    return render_404 if external_upload_stub.blank?

    message = check_multipart_upload_exists(external_upload_stub)
    return render_404(message) if message.present?

    store = multipart_store(external_upload_stub.upload_type)
    parts =
      parts
        .map do |part|
          part_number = part[:part_number]
          etag = part[:etag]
          part_number = validate_part_number(part_number)

          if etag.blank?
            raise Discourse::InvalidParameters.new(
                    "All parts must have an etag and a valid part number",
                  )
          end

          # this is done so it's an array of hashes rather than an array of
          # ActionController::Parameters
          { part_number: part_number, etag: etag }
        end
        .sort_by { |part| part[:part_number] }

    begin
      store.complete_multipart(
        upload_id: external_upload_stub.external_upload_identifier,
        key: external_upload_stub.key,
        parts: parts,
      )
    rescue Aws::S3::Errors::ServiceError => err
      return(

View on GitHub (pinned to 1b2d7253e8)

When it happens

Trigger: Thrown at lib/external_upload_helpers.rb:246 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of discourse/discourse@1b2d7253e8 (2026-08-26). Data as JSON: /api/errors/0c3a64aeee6442db. Report an issue: GitHub.