--- title: "Bringing Rails into the Ractor age" publication: "Ruby Weekly" issue: 814 published_at: "2026-08-27" canonical_url: "https://rubyweekly.com/issues/814" --- Plus a new way to convert HTML to PDF from Ruby, Balkan Ruby videos, and a fresh look at Hanami. #โ€‹814 โ€” August 27, 2026 [Read on the Web](https://rubyweekly.com/issues/814) ๐Ÿ—“๏ธ In case you were wondering where we were last week, we took a brief summer vacation. Luckily, it's been a _busy_ couple of weeks in the Ruby world! __ _Your editor, Peter Cooper_ Together with [![AppSignal logo\](https://res.cloudinary.com/cpress/image/upload/c_fill,g_auto,w_1280,h_372/co_white,e_outline:7/nl4ksfby2hmtz6vx5vzw.png)](https://www.appsignal.com/ruby?utm_medium=paid&utm_campaign=rubyweekly&utm_source=rubyweekly&utm_content=primary&utm_term=0827) Ruby Weekly [![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/a79m4whaihamxdtztxtx.jpg)](https://railsatscale.com/2026-08-11-ractors-on-rails/) [Bringing Rails Into the Ractor-Age](https://railsatscale.com/2026-08-11-ractors-on-rails/) โ€” _"Ractors are now viable in production, and Ruby 4.1 will make them even better,"_ says Edouard, who looks at what Ractors can unlock for Rails apps (nearly 7x memory savings vs Puma on a real-world app) and the steps being taken to get it all working in the near future. Edouard Chin ๐Ÿ˜Ž Over on Reddit, [Charles Oliver Nutter noted](https://www.reddit.com/r/ruby/comments/1vtw21w/bringing_rails_into_the_ractorage/p5sxaav/) _"Of course you can do fully parallel shared memory concurrency in Rails today just by running on JRuby."_ [![\](https://res.cloudinary.com/cpress/image/upload/c_limit,w_480,h_480,q_auto/copm/43b86015.png)](https://www.appsignal.com/ruby?utm_medium=paid&utm_campaign=rubyweekly&utm_source=rubyweekly&utm_content=primary&utm_term=0827) [One Ruby Gem Replaced Their Entire Monitoring Stack](https://www.appsignal.com/ruby?utm_medium=paid&utm_campaign=rubyweekly&utm_source=rubyweekly&utm_content=primary&utm_term=0827) โ€” Now it's one gem. AppSignal tracks errors, N+1 queries, slow SQL, Sidekiq jobs, and host metrics for Rails โ€” every feature on every plan, no add-on tiers. Real engineers answer support, not a ticket queue. [30-day free trial, no credit card](https://www.appsignal.com/ruby?utm_medium=paid&utm_campaign=rubyweekly&utm_source=rubyweekly&utm_content=primary&utm_term=0827). AppSignal sponsor [A Ruby 4.0 Universal RCE Deserialization Gadget Chain](https://www.elttam.com/blog/ruby-4-0-universal-rce-deserialization-gadget-chain) โ€” A new universal chain (found by [elttam](https://www.elttam.com/), a security research firm) that turns one `Marshal.load` call into an RCE on Ruby 4.0.6. Some fun technical details here, and a strong reminder to avoid using `Marshal.load` on untrusted input. Luke Jahnke **โšก๏ธ IN BRIEF:** - **You need to upgrade the `resolv` gem** as [two vulnerabilities have just been discovered](https://www.ruby-lang.org/en/news/2026/08/27/multiple-vulnerabilities-in-resolv/) โ€“ though only if you call `Resolv` directly or load `resolv-replace`; the OS resolver behind `Net::HTTP` isn't affected. - [RubyGems and Bundler 4.0.19](https://blog.rubygems.org/2026/08/20/4.0.19-released.html) now conclude `install`, `update`, and `lock` with a summary of which versions cooldown held back. - ๐Ÿ“บ [Talks from May's _Balkan Ruby 2026_](https://www.youtube.com/playlist?list=PLRbI7hyJV3kA) event are now on YouTube. If forced to pick just one, Jean Boussier's [โ–ถ๏ธ "Multiprocessing is the most efficient way to serve Rails apps"](https://www.youtube.com/watch?v=QYIGmRXPZcw&list=PLRbI7hyJV3kA&index=3) is particularly informative. - Rails has [merged support for the HTTP `QUERY` method](https://github.com/rails/rails/pull/57973). Idempotent like `GET`, but the query goes in the body. - Sam Ruby's latest _"get real apps running on [Spinel](https://github.com/matz/spinel)"_ efforts have [progressed to 37signals' Campfire](https://intertwingly.net/blog/2026/08/25/Campfire-on-Spinel.html) chat app. [Thinking About Tests: Assertions and Matchers](https://zverok.space/blog/2026-08-16-assertions-and-matchers.html) โ€” Starting from first principles, a look down to the level of single assertions, what a 'matcher' is, and why lucid, composable tests matter now more than ever. Victor Shepelev [Rails Adopts Herb as an Alternative ERB Implementation](https://github.com/rails/rails/pull/58552) โ€” [Herb](https://herb-tools.dev) parses HTML and ERB into one syntax tree, so it understands your markup at compile time and can catch invalid Ruby or HTML output. Now merged into Action View as an Erubi alternative, though it's opt-in for now. Marco Roth et al. ๐Ÿค– [Agents on Rails: The First Benchmark Report](https://rubyonrails.org/2026/8/13/agents-on-rails-the-first-benchmark-report) โ€” The Rails Foundation ran a benchmark of various AI models across 21 tasks on the [Writebook](https://github.com/basecamp/writebook) app (fixing bugs, working on security issues, etc.) Find out which models 'know' Rails best. The Rails Foundation ๐Ÿ’ก In a follow up, [the team shares `lemans`](https://rubyonrails.org/2026/8/24/agents-on-rails-lemans), the Ruby-powered harness used in the evals above. It's [open source](https://github.com/rails/lemans) so you can now use it too. [๐Ÿšจ Rails 7.2 Hit EOL Aug 9. Ready for Your SOC 2 Audit?](http://go.fastruby.io/2af) โ€” We map Rails, Ruby, and runtime EOL across your stack and hand your auditors evidence, not assurances. FastRuby.ioยฎ | Infrastructure Assessment sponsor ๐Ÿ“„ [From Slow Tests to Slow Production: Debugging with Stackprof](https://www.aha.io/engineering/articles/debugging-with-stack-prof) โ€“ Going from a curiously slow Rails test to the one-line root cause. Jeremy Stuckey ๐Ÿ“„ [A Fresh Look at Hanami](https://leftofthe.dev/2026/08/24/hanami-3-impressions.html) โ€“ Love Ruby, but looking to expand beyond Rails? Some notes on doing just that. Aaron Sumner ๐Ÿ“„ [What Replacing React with Hotwire Really Costs](https://www.fastruby.io/blog/what-replacing-react-with-hotwire-really-costs.html) Henrique Medeiros ๐Ÿ›  Code & Tools [![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/rt8q95dym0he0hefzhm9.jpg)](https://github.com/waka/sghtmltopdf#readme) [sghtmltopdf: HTML to PDF Without a Browser Engine](https://github.com/waka/sghtmltopdf#readme) โ€” Billing itself as _"the second generation of wkhtmltopdf and wicked_pdf"_, this is an HTML-to-PDF renderer that _doesn't_ depend on a browser process. Built for invoices and reports, not arbitrary pages, and it'll repeat table headers across page breaks. yo_waka [Blog Post: Your Vibe-Coded Monitoring Tool Now Needs Its Own Monitoring](https://blog.appsignal.com/2026/08/18/why-you-shouldnt-vibe-code-your-monitoring-tool.html?utm_medium=paid&utm_campaign=rubyweekly&utm_source=rubyweekly&utm_content=sponsored-link&utm_term=0827) โ€” 45% of AI-generated code ships an OWASP Top 10 bug. So who monitors the monitor? AppSignal sponsor [A Guide to Using Batches in Solid Queue 1.7](https://jpcamara.com/2026/08/24/a-guide-to-using-batches.html) โ€” Batches have been an often-requested feature in [Rails' default queue system](https://github.com/rails/solid_queue) and have finally landed. Its implementer explains here how batches behave, including callbacks, nesting, and patterns worth using. JP Camara [Kino 0.4: A High-Perf Ractor Web Server for Ruby 4.0+](https://yaroslav.io/opensource/kino) โ€” A Ractor-based web server that uses every core in one process instead of forking. [This week's release](https://github.com/yaroslav/kino/releases/tag/v0.4.0) adds a Rack handler, so `rails server -u kino` boots (though Rails isn't Ractor-shareable yet, so it runs in a fallback mode). Yaroslav Markin - [RuboCop 1.90.0](https://github.com/rubocop/rubocop/releases/tag/v1.90.0) โ€“ The code analyzer/formatter adds a long-awaited `disable-next` directive, a `--display-suppressed` option that reveals what your directive comments are hiding, and more. - [RBS 4.2](https://github.com/ruby/rbs/releases/tag/v4.2.0) โ€“ Ruby's type signature language now supports non-ASCII characters in identifiers and drops Ruby 3.2 support. - [ActiveRecord-Import 2.3](https://github.com/zdennis/activerecord-import) โ€“ Library for efficient bulk insertion of data using Active Record. - [ValidEmail2 7.1](https://github.com/micke/valid_email2) โ€“ Validates email addresses and the domains they use. - [Ferrum 0.18.0](https://github.com/rubycdp/ferrum/releases/tag/v0.18.0) โ€“ High-level API for controlling Chrome from Ruby. - [Comma 5.0](https://github.com/comma-csv/comma) โ€“ DSL-based CSV generator for Ruby objects. - [rubyzip 3.5](https://github.com/rubyzip/rubyzip/releases/tag/v3.5.0) โ€“ Library for reading and writing ZIP files. ๐Ÿ“ฐ Classifieds ๐Ÿ’Ž Shipping Ruby code with AI agents? [Undercover CI](https://undercover-ci.com) catches untested methods in your PRs before you merge. Coverage percentages won't. --- ๐Ÿšข Shipped a fix? Ask Claude or Cursor what [AppSignal](https://www.appsignal.com/tour/mcp-server?utm_medium=paid&utm_campaign=rubyweekly&utm_source=rubyweekly&utm_content=classif) sees in the latest deploy โ€” error rates, latency, traces, without leaving your editor. ๐Ÿ—“ Upcoming Ruby Events - ๐Ÿ‡บ๐Ÿ‡ธ [Rails Camp West (Sep 7-11 in Oregon)](https://west.railscamp.us/2026) โ€” A four night retreat/unconference in the wilderness. - ๐Ÿ‡จ๐Ÿ‡ฟ [EuRuKo 2026 (Sep 17-18 in Brno, Czechia)](https://2026.euruko.org) โ€” Europe's longest-running Ruby conference. Matz and Koichi Sasada to keynote! - ๐Ÿ‡บ๐Ÿ‡ธ [Rails World 2026 (Sep 23-24 in Austin, TX)](https://rubyonrails.org/world/2026) โ€” The Rails Foundation's flagship event. [Here's the speaker lineup.](https://rubyonrails.org/2026/6/22/here-are-the-rails-world-2026-speakers) - ๐Ÿ‡บ๐Ÿ‡ธ [Rocky Mountain Ruby 2026 (Sep 28-29 in Boulder, CO)](https://rockymtnruby.dev) โ€” A well-regarded regional US Ruby conference. - ๐Ÿ‡ซ๐Ÿ‡ฎ [Tiny Ruby Conf (Oct 1 in Helsinki)](https://helsinkiruby.fi/tinyruby/) - ๐Ÿ‡จ๐Ÿ‡ฆ [XO Ruby (Oct 3 in Toronto)](https://www.xoruby.com/event/toronto-2/) - ๐Ÿ‡ฏ๐Ÿ‡ต [Kaigi on Rails 2026 (Oct 16-17 in Tokyo / Online)](https://kaigionrails.org/2026/) โ€” Rails-focused conference with DHH keynoting. - ๐Ÿ‡บ๐Ÿ‡ธ [SF Ruby Startup Conference 2026 (Nov 10-12 in San Francisco)](https://sfruby.com/) โ€” The _Evil Martians_ have [written a post about why you should go](https://evilmartians.com/chronicles/why-engineers-should-come-to-the-sf-ruby-startup-conference-in-2026). โ„น๏ธ Note: _This list is not exhaustive, but we'll continue to mention and promote various events here from time to time._ Curated by [Peter Cooper](https://twitter.com/cooperx86) and [Glenn Goodrich](https://twitter.com/ruprict). Published by [Cooperpress](https://cooperpress.com/). [Change your email](https://rubyweekly.com/edit_subscription/*|UID|*) or [Stop getting this newsletter.](https://rubyweekly.com/leave/*|UID|*) ยฉ Cooper Press Ltd ยท Fairfield Enterprise Centre, Louth, LN11 0LS, United Kingdom Other weekly newsletters we publish include [Postgres Weekly](https://postgresweekly.com/), [React Status](https://react.statuscode.com/), [Frontend Focus](https://frontendfoc.us/), and [JavaScript Weekly](https://javascriptweekly.com/).