# Ruby Ruby is a programming language with libraries, frameworks, and tooling for software development. This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## Researchers link the RubyHack campaign to alleged OpenAI-connected agents, while RubyGems disputes key claims DevFeed: [Researchers link the RubyHack campaign to alleged OpenAI-connected agents, while RubyGems disputes key claims]() Original publisher: [Read original article]() Author: amaksimovv (CodeScoring) Published: 2026-09-16T15:08:49Z Content type: news Language: ru Sources: [Tagir Valeev]() Topics: [rubygems](), [Ruby](), [OpenAI](), [legacy](), [API]() Tags: [api](), [appsec](), [cdn](), [gemstuffer](), [legacy](), [load](), [openai](), [ruby](), [rubydoc](), [rubygems](), [rubyhack](), [tag-070ecaaf0eda](), [tag-64251c106897](), [yard]() ### AI overview Researchers from Nightingale Collective linked the RubyHack campaign in RubyGems to alleged internal OpenAI agents. The article describes malicious code executed during RubyDoc documentation builds, data collection from British municipal websites, attempts to obtain RubyGems API keys, and a caching flaw involving legacy keys. RubyGems said it could not independently identify the package creators and found no evidence that чужие keys were successfully obtained. ### Source excerpt 11 сентября исследователи Nightingale Collective опубликовали разбор RubyHack и связали майскую кампанию в RubyGems с внутренними агентами OpenAI. По их версии, скрипты внутри пакетов запускали код в инфраструктуре RubyDoc, собирали открытые данные с сайтов британских муниципалитетов и публиковали результаты обратно в реестр. В нескольких образцах исследователи также обнаружили попытки получить чужие API-ключи RubyGems. Команда RubyGems не смогла независимо установить, кем именно были созданы пакеты, и не нашла доказательств успешного получения чужих ключей. Во время майской кампании она отозвала вредоносные пакеты и на четыре дня остановила регистрацию новых пользователей. Одной из точек входа стала обычная сборка документации. В пакет добавляли .yardopts - файл параметров генератора YARD - с указанием загрузить Ruby-скрипт. Когда для пакета запрашивали документацию на RubyDoc, сборщик обрабатывал этот файл и запускал вложенный код. Такое поведение соответствует механике самого YARD: параметр --load загружает указанный Ruby-файл перед выполнением команды. Запущенный скрипт обращался к муниципальным сайтам, сохранял ответы, собирал из них новый .gem-архив и отправлял его в RubyGems со встроенным ключом. В результате реестр использовался как канал передачи и хранения собранных данных. Установка такого пакета множеством разработчиков для работы этой схемы не требовалась: достаточно было исполнения кода в сервисе сборки документации. Отдельные пакеты обращались к старому endpoint выдачи API-ключей. В нём действовала ошибка кэширования: при определённых условиях CDN мог сохранить ответ с legacy-ключом и до часа отдавать его следующим запросам на том же узле. RubyGems исправил проблему 9 июля, очистил кэш, отозвал legacy-ключи и затем отключил старый endpoint. Читать далее ## Ruby 4.0.7 Released DevFeed: [Ruby 4.0.7 Released]() Original publisher: [Read original article]() Published: 2026-09-15T00:25:58Z Content type: release Language: en Sources: [Ruby-lang]() Topics: [Ruby](), [releases](), [bug]() Tags: [2026](), [bugfixes](), [contributions](), [download](), [release](), [release-schedule](), [releases](), [ruby](), [sha256](), [xz](), [zip]() ### AI overview Ruby 4.0.7 has been released as a routine update containing bugfixes. The article says Ruby 4.0.8 is planned for November, with earlier release possible if a significant user-impacting change arises. ### Source excerpt Ruby 4.0.7 has been released. This is a routine update that includes bugfixes. Please see the GitHub releases for further details. Release Schedule We intend to release the latest stable Ruby version (currently Ruby 4.0) every two months following the most recent release. Ruby 4.0.8 will be released in November. If a change arises that significantly affects users, a release may occur earlier than planned. 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Thanks for their contributions. Posted by k0kubun on 15 Sep 2026 ## OpenAI's malicious bot swarm attacked RubyGems DevFeed: [OpenAI's malicious bot swarm attacked RubyGems]() Original publisher: [Read original article]() Author: Jessica Lyons Published: 2026-09-14T18:03:58Z Content type: news Language: en Sources: [www.theregister.com - Articles]() Topics: [OpenAI](), [Bot](), [Ruby](), [Cybercrime]() Tags: [ai-and-ml](), [malware](), [openai](), [ruby](), [rubygems](), [security]() ### AI overview The article reports that a malicious bot swarm associated with OpenAI attacked RubyGems. ### Source excerpt Ruby are you ok? Ruby are you ok? Are you ok Ruby? ## How to add WorkOS AuthKit to a Ruby on Rails app DevFeed: [How to add WorkOS AuthKit to a Ruby on Rails app]() Original publisher: [Read original article]() Author: WorkOS Published: 2026-09-14T00:00:00Z Content type: tutorial Language: en Sources: [WorkOS Blog]() Topics: [Rails](), [Authentication](), [Ruby](), [Command-line interface](), [Authorization](), [password reset]() Tags: [authentication](), [building](), [cli](), [how-to](), [password-reset](), [production](), [ruby](), [sign-in]() ### AI overview A tutorial on adding WorkOS AuthKit to a Ruby on Rails application. It explains how the CLI sets up the integration, how the sealed-cookie session layer is refreshed in a Rails before_action, and how Redirect URI, Initiate login URL, and Sign-out URI settings affect authentication flows and production logout. ### Source excerpt The CLI gets you signed in. This is the session layer underneath it: what the sealed cookie holds, how to refresh it inside a before_action, and the three dashboard settings that break logout in production. ## Standardizing Exception Message Style in Ruby DevFeed: [Standardizing Exception Message Style in Ruby]() Original publisher: [Read original article]() Author: Daniel Doubrovkine (dblock@dblock.org) Published: 2026-09-05T00:00:00Z Content type: article Language: en Sources: [Daniel Doubrovkine]() Topics: [Ruby](), [Exception](), [ci]() Tags: [ci](), [exception](), [exceptions](), [grape](), [lint](), [open-source](), [plugin](), [ruby](), [standard]() ### AI overview The article explains a convention for Ruby exception messages: they should generally begin with lowercase and omit trailing punctuation because they follow the exception class name and a colon. It describes fixing seven inconsistent sites in Grape, documenting the convention, and releasing the rubocop-exception_messages RuboCop plugin to enforce casing and punctuation, with additional checks for redundant class names and interpolation markers. ### Source excerpt While reviewing dozens of PRs from ericproulx optimizing Grape's internals recently, I noticed that the bare raise ArgumentError, "..." calls scattered across the codebase were inconsistent: some messages were capitalized, some ended in a period, most were not. Longtime readers know where this is going. Ruby's own core and standard library exceptions don't do this - TypeError: no implicit conversion from nil to integer, ArgumentError: wrong number of arguments, and so on all read lowercase and unpunctuated, because the message is meant to be read after the exception class name and a colon, not as a standalone sentence. Grape's own Grape::Exceptions::* classes already follow this convention. The bare raise ArgumentError, "..." calls in dsl/entity.rb, dsl/inside_route.rb, dsl/validations.rb, and validations/types/dry_type_coercer.rb didn't, so I fixed those seven sites and documented the convention in CONTRIBUTING.md, in #2909. To avoid regressions, I wrote rubocop-exception_messages, a RuboCop plugin gem with two cops: ExceptionMessages/Casing flags (and autocorrects) messages that don't start with a lowercase letter. ExceptionMessages/Punctuation flags (and autocorrects) messages with a trailing period, with an exception for a literal ellipsis ("still processing.."), which is stylistic rather than a sentence ending. Both cops recognize raise Class, "message" and raise Class.new("message") forms, and handle interpolated (dstr) messages by only checking the literal string segments (the first segment for casing, the last for punctuation), since interpolated values in the middle are out of the cop's control. # bad raise ArgumentError, 'Missing required option.' # good raise ArgumentError, 'missing required option' The gem ships as a modern RuboCop plugin (via lint_roller), so it's a one-line addition to a consuming project's .rubocop.yml: plugins: - rubocop-exception_messages rubocop-exception_messages 0.2.0 is out now, and I've added it back to Grape's own Gemfile and ## Why Gusto hired Evil Martians for Sidekiq infrastructure DevFeed: [Why Gusto hired Evil Martians for Sidekiq infrastructure]() Original publisher: [Read original article]() Author: Irina Nazarova (inazarova@evilmartians.com) Published: 2026-09-02T00:00:00Z Content type: article Language: en Sources: [Evil Martians]() Topics: [Sidekiq](), [Rails](), [Redis](), [Ruby]() Tags: [ai](), [case-study](), [engineering](), [infrastructure](), [rails](), [redis](), [ruby](), [scale](), [sidekiq]() ### AI overview This case study examines why Gusto hired Evil Martians to work on the Sidekiq and Redis infrastructure supporting background jobs in its large Rails monolith. It discusses the operational demands of running payroll-related jobs at scale and the tradeoffs involved when a company uses consultants instead of waiting for a perfect hire. ### Source excerpt Gusto runs payroll for 500,000+ businesses on one of the largest Rails monoliths anywhere. Why a team this strong hired Evil Martians for Sidekiq at scale, what running background jobs at that size actually takes, and when to stop waiting for the perfect hire. ## Adventures in Daylight Saving, Norfolk Island, and Time Zone Math (in Ruby) DevFeed: [Adventures in Daylight Saving, Norfolk Island, and Time Zone Math (in Ruby)]() Original publisher: [Read original article]() Author: Daniel Doubrovkine (dblock@dblock.org) Published: 2026-08-28T00:00:00Z Content type: article Language: en Sources: [Daniel Doubrovkine]() Topics: [Ruby](), [DateTime](), [bug]() Tags: [bug](), [code](), [open-source](), [ruby](), [time]() ### AI overview This article explains how several bugs in the Ruby gem distance_of_time_in_words were caused by incorrect assumptions about daylight-saving transitions and time-zone offsets. Fixes replaced DST checks and one-hour special cases with comparisons of actual UTC offsets, handling Europe/Dublin and Norfolk Island correctly. ### Source excerpt distance_of_time_in_words is a small Ruby gem that turns two Time objects into a human-readable string like "3 days and 4 hours". Several separate bug reports against it turned out to be variations on the same theme: computing a duration between two timestamps is not the trivial subtraction it looks like, the moment time zones are involved. The first two fixes shipped in dotiw 5.6.0; four more followed shortly after in dotiw 5.6.1. Bug 1: dst? Lies When You Least Expect It #63 reported that a duration of one minute was rendered as "less than 1 second" for users in Europe/Dublin. The gem's TimeHash had a DST correction that looked reasonable: d = largest - smallest d -= 1.hour if smallest.dst? && !largest.dst? d += 1.hour if !smallest.dst? && largest.dst? The idea: if a DST transition happened between the two times, Time subtraction already accounts for the wall-clock jump, so cancel it back out before splitting the duration into calendar units. That works everywhere except Ireland. Europe/Dublin uses an inverted DST scheme: its winter time is legally defined as "standard time minus one hour" rather than the more common "standard time is winter, summer is +1". Depending on whether a Time was constructed via Time.at(seconds) or datetime.to_time, dst? could report different values for the exact same instant, even though utc_offset agreed. The correction fired when it shouldn't have, and a real one-minute gap got silently zeroed out. Reproducing it doesn't even require mocking dst? -- just running the example with the right TZ set is enough: ENV['TZ'] = 'Europe/Dublin' start = Time.at(DateTime.now) finish = DateTime.now + 1.minute # => "less than 1 second" # expected: "1 minute" distance_of_time_in_words(start, finish) The fix (PR #152) was to stop asking "is this DST?" and just compare the actual offsets: def offset_decreased?(smallest, largest) smallest.utc_offset > largest.utc_offset end def offset_increased?(smallest, largest) smallest.utc_offset < largest.utc_offset ## Security advisories: CVE-2026-80212 and CVE-2026-80213 DevFeed: [Security advisories: CVE-2026-80212 and CVE-2026-80213]() Original publisher: [Read original article]() Published: 2026-08-27T00:00:00Z Content type: news Language: en Sources: [Ruby-lang]() Topics: [Ruby](), [Vulnerabilities](), [Security](), [Network]() Tags: [2026](), [cve](), [dependencies](), [dependency](), [dns](), [end-of-life](), [memory](), [network](), [ruby](), [security](), [update](), [vulnerabilities]() ### AI overview Ruby's bundled resolv gem has two vulnerabilities: malicious DNS responses can cause unbounded memory exhaustion, and specially crafted overlong hostnames can bypass hostname validation. The advisory identifies affected versions and recommends updating the gem. ### Source excerpt Two vulnerabilities have been discovered in the resolv gem bundled with Ruby. They have been assigned the CVE identifiers CVE-2026-80212 and CVE-2026-80213. We recommend upgrading the resolv gem. CVE-2026-80212: Memory exhaustion through malicious DNS responses An application that resolves a hostname an attacker can influence, such as a webhook target or a user-supplied URL, can be made to consume memory without bound. The attacker points a domain at a name server they control and returns responses that the library retains permanently. Repeated lookups grow the process until it runs out of memory and the service stops. CVE-2026-80213: Hostname validation bypass An application that checks a hostname against an allow list or an SSRF filter and then resolves it can be made to look up a domain other than the one it checked. The string that passes validation and the name that reaches the network are not the same, so the connection can end up at a host the application never approved. This requires a hostname that exceeds the DNS length limits, so validation that rejects names longer than 255 octets, or labels longer than 63 octets, is not affected. Affected versions resolv gem 0.4.0 through 0.7.1 resolv gem 0.3.1 and earlier The version bundled with Ruby differs per series: Ruby 4.0 ships resolv 0.7.0, Ruby 3.4 ships 0.7.1, and Ruby 3.3 ships 0.3.1. What to check Only code that resolves names through this gem is affected. Ordinary socket connections, including Net::HTTP and anything built on TCPSocket, use the operating system resolver and are not. Net::HTTP does load the gem, but only for its IP address regular expressions, so a loaded gem is not by itself a sign of exposure. An application reaches the affected code by calling Resolv itself, by loading resolv-replace, which routes all socket name resolution through the gem, or through a dependency that resolves names this way. Check your dependencies as well as your own code. Recommended action Update the resolv gem to 0 ## Why engineers should come to the SF Ruby Startup Conference in 2026 DevFeed: [Why engineers should come to the SF Ruby Startup Conference in 2026]() Original publisher: [Read original article]() Author: Travis Turner (richardturner@evilmartians.com) Published: 2026-08-26T00:00:00Z Content type: opinion Language: en Sources: [Evil Martians]() Topics: [Ruby](), [Rails](), [Open Source](), [Development](), [React]() Tags: [2026](), [agentic](), [ai](), [conference](), [developer-community](), [llms](), [open-source](), [rails](), [react](), [ruby]() ### AI overview The SF Ruby Startup Conference is presented as an engineers' conference focused on Ruby, Rails, open source, production systems, and community connections. The article explains its emphasis on building Ruby success stories and highlights Inertia Rails as an approach for building Rails applications with React. ### Source excerpt The SF Ruby Startup Conference is an engineers' conference: meet the people building Ruby open source, scaling Rails in production, and shaping what agentic Rails looks like next. ## Efficient Bulk Hash Insertion with Redis 8.10's HIMPORT DevFeed: [Efficient Bulk Hash Insertion with Redis 8.10's HIMPORT]() Original publisher: [Read original article]() Author: David Maier Published: 2026-08-24T00:00:00Z Content type: article Language: en Sources: [Redis Blog]() Topics: [Redis](), [Ruby](), [Code](), [Command-line interface]() Tags: [article](), [cli](), [code](), [make](), [redis](), [ruby](), [tech]() ### AI overview This article explains how to use Redis 8.10's HIMPORT command with redis-rb to perform more efficient bulk hash insertion in Ruby. It covers connection setup, prepared field sets, automatic preparation, reconnection behavior, the demo CLI, and pipelined imports. ### Source excerpt I'm not a Ruby developer, and my code samples might make that clear. However, there are two reasons I'm using Ruby for the examples in this article: A new release of redis-rb. Its support for a new Redis command: HIMPORT. Getting started Establish... ## How to reduce Rails boot time with require-profiler and Bootsnap DevFeed: [How to reduce Rails boot time with require-profiler and Bootsnap]() Original publisher: [Read original article]() Author: Travis Turner (richardturner@evilmartians.com) Published: 2026-08-19T00:00:00Z Content type: tutorial Language: en Sources: [Evil Martians]() Topics: [Rails](), [Optimization](), [Ruby](), [Instrumentation](), [Docker](), [Development]() Tags: [development](), [docker](), [dx](), [instrumentation](), [optimization](), [performance](), [rails](), [ruby]() ### AI overview This guide explains how to profile and reduce Rails application boot time using require-profiler, sampling profilers, and Bootsnap. It describes profiling results from real projects, including a 40% reduction for a 200-component monolith, and covers cache precompilation and verification in Docker-based production builds. ### Source excerpt Rails boot time is a DX metric in the AI age: meet require-profiler, learn to actually read sampling profilers, and see the pit stop that cut a 200-component monolith's boot by 40%. ## Benchmarks Are Free Now DevFeed: [Benchmarks Are Free Now]() Original publisher: [Read original article]() Author: Daniel Doubrovkine (dblock@dblock.org) Published: 2026-08-15T00:00:00Z Content type: article Language: en Sources: [Daniel Doubrovkine]() Topics: [Ruby](), [Benchmark](), [Polymorphism](), [GitHub Copilot CLI]() Tags: [ai](), [benchmarks](), [caching](), [cli](), [copilot](), [open-source](), [performance](), [ruby]() ### AI overview A Ruby enum inheritance fix was correct but made subclass lookups about five times slower because merged enum hashes were rebuilt on every call. Benchmarks generated with Copilot CLI exposed the regression, and memoization restored subclass performance to the base-class level. Additional benchmarks quantified the gem's small overhead for hash-backed lookups and much larger overhead for exhaustive matching. ### Source excerpt My previous post walked through four bugs in ruby-enum, a gem I maintain, all stemming from the fact that class-level instance variables aren't inherited by subclasses. The third fix, #59, made keys, key?, value?, key, value, to_h, parse and each walk up superclass and merge in a parent's enums, so a subclass would see everything its ancestors defined. It was correct, fully tested, and shipped. It also made every one of those methods roughly 5x slower on any subclass. def _enum_hash if superclass < Ruby::Enum superclass.send(:_enum_hash).merge(_own_enum_hash) else _own_enum_hash end end This recomputes the merged hash, walking the entire ancestor chain, on every single call. There's no caching. A one-level subclass calling .value pays for building a brand new hash, on top of the superclass doing the same, every time. The test suite didn't notice because tests check correctness, not speed, and correctness was fine. I only found this because I asked Copilot CLI to add a benchmark script comparing lookups at different inheritance depths, mostly out of curiosity about how the "Benchmarks" section of the README would read next to the new feature. It took one prompt and about a minute to get a working script: class Colors include Ruby::Enum define :RED, 'red' define :GREEN, 'green' end class SubColors < Colors define :BLUE, 'blue' end class SubSubColors < SubColors define :YELLOW, 'yellow' end benchmark('base class (no inheritance)', n) { Colors.value(:RED) } benchmark('subclass (1 level)', n) { SubColors.value(:RED) } benchmark('sub-subclass (2 levels)', n) { SubSubColors.value(:RED) } The first run told the story immediately: a 1-level subclass's .value calls took roughly 5x as long as the base class, and a 2-level subclass was worse still. Nobody had written this benchmark before merging #59 because writing a throwaway benchmark script used to feel like more ceremony than it was worth for a one-off performance check. Now it's a single sentence to an agent, and the scri ## Ruby Instance Variables Are Not Inherited (and Why That Breaks Your DSL) DevFeed: [Ruby Instance Variables Are Not Inherited (and Why That Breaks Your DSL)]() Original publisher: [Read original article]() Author: Daniel Doubrovkine (dblock@dblock.org) Published: 2026-08-14T00:00:00Z Content type: article Language: en Sources: [Daniel Doubrovkine]() Topics: [Ruby](), [bug](), [Library](), [Development](), [Rails]() Tags: [bug](), [development](), [library](), [open-source](), [pull-requests](), [rails](), [ruby]() ### AI overview This article explains how Ruby instance variables used by the ruby-enum gem are not inherited by subclasses, causing failures involving subclassing, class reloading, and redundant module inclusion. It describes fixes shipped in ruby-enum 1.2.0, including lazy defaults and explicit merging of inherited enums. ### Source excerpt The ruby-enum gem is a small library I maintain that adds enum-like behavior to a class via include Ruby::Enum and define :KEY, value. Four pull requests landed against it recently, each fixing a different symptom, and all four turned out to be the same underlying bug: class-level instance variables set in a module's included hook are not inherited by subclasses the way you might expect. All of these fixes shipped in ruby-enum 1.2.0. Ruby::Enum stores its keys and values in instance variables on the class itself, set up when the module is included. def self.included(base) base.extend ClassMethods base.instance_variable_set(:@_enum_hash, {}) base.instance_variable_set(:@_enums_by_value, {}) end This works fine for a single class. It gets interesting the moment subclasses or class reloading show up. A user opened #56, reporting DuplicateKeyError from a Rails console after a class that had already defined its enums got reloaded. It reproduces without Rails. class_body = proc do include Ruby::Enum define :RED, 'red' end Colors = Class.new(&class_body) Colors.class_eval(&class_body) # raises DuplicateKeyError Rails' development-mode autoloader re-evaluates a class body, and the second define :RED sees @_enum_hash still holding RED from the first load, so the duplicate-key check fires. The fix clears the hash whenever Ruby::Enum is included, rather than assuming it's always a fresh class. The contributor that reported the problem and submitted the fix also caught a sneakier variant: a subclass that redundantly re-includes Ruby::Enum (include is supposed to be idempotent, right?) was wiping out enums inherited from its parent, because included unconditionally reset the instance variables: class OtherSecondSubclass < FirstSubclass include Ruby::Enum # redundant, but shouldn't lose FirstSubclass's enums define :MAGENTA, 'magenta' end Thanks, Nazar, for tracking both of these down with tests. Months later, #49 surfaced a related crash: a subclass that never calls define itsel ## Fair by design: orchestrating background jobs in Ruby DevFeed: [Fair by design: orchestrating background jobs in Ruby]() Original publisher: [Read original article]() Author: Travis Turner (richardturner@evilmartians.com) Published: 2026-08-11T00:00:00Z Content type: tutorial Language: en Sources: [Evil Martians]() Topics: [Ruby](), [jobs](), [Latency](), [autoscaling]() Tags: [autoscaling](), [how-to](), [jobs](), [latency](), [performance](), [rails](), [redis](), [ruby](), [sidekiq]() ### AI overview This tutorial examines fairness in Ruby background-job processing. It explains how queue latency affects quality of service, why adding workers or autoscaling may be limited by shared resources and operational cost, and introduces background-job prioritization as a way to address bottlenecks. ### Source excerpt Are you treating your users fairly? They could be stuck in the queue while a greedy user monopolizes resources. And you might not even know it! In this post, you'll see if it's time for you to take background job prioritization seriously, and how to make it fair for all users. ## Generating AI Descriptions of Automated Pull Requests DevFeed: [Generating AI Descriptions of Automated Pull Requests]() Original publisher: [Read original article]() Author: Daniel Doubrovkine (dblock@dblock.org) Published: 2026-08-11T00:00:00Z Content type: tutorial Language: en Sources: [Daniel Doubrovkine]() Topics: [GitHub Copilot CLI](), [GitHub Actions](), [GitHub Copilot](), [Large Language Model](), [Ruby](), [Slack](), [changelog](), [Pull Request](), [Open Source](), [JSON](), [YAML]() Tags: [ai](), [automated](), [changelog](), [ci](), [cli](), [copilot](), [github](), [github-actions](), [github-copilot](), [github-copilot-cli](), [json](), [llm](), [open-source](), [pull-request](), [pull-requests](), [ruby](), [yaml]() ### AI overview A tutorial explains how the maintainer of the slack-ruby-client library uses a scheduled GitHub Actions workflow and GitHub Copilot CLI to generate meaningful commit messages, pull request bodies, and CHANGELOG entries from diffs of regenerated Slack API code. It also covers YAML indentation, prompt files, response logging, and extracting a JSON result from Copilot CLI output. ### Source excerpt The slack-ruby-client library, an open source Ruby gem I maintain, runs a scheduled GitHub Actions workflow that regenerates code from Slack's API definitions and opens a pull request with the diff. The commit message and CHANGELOG entry used to be a generic "Update API (2026-08-11)", which told a reviewer nothing about what actually changed. Here's how we taught the workflow to describe its own diffs, using GitHub Copilot CLI, which open source maintainers can get for free. The Idea The workflow already computes a diff before opening the pull request. Instead of a boilerplate commit message, we pipe that diff through an LLM and ask it to summarize what changed, then use the response as the commit message and PR body. - name: Check for changes id: changes run: | if git diff --quiet; then echo "changed=false" >> "$GITHUB_OUTPUT" else echo "changed=true" >> "$GITHUB_OUTPUT" fi - name: Prepare diff for AI summary if: steps.changes.outputs.changed == 'true' run: | git diff --stat | sed 's/^/ /' > /tmp/diff_stat.txt git diff | head -c 20000 | sed 's/^/ /' > /tmp/diff.txt The sed 's/^/ /' indent isn't decorative. actions/ai-inference substitutes template variables as raw text into a prompt YAML file before parsing it, so a multi-line diff starting at column 0 breaks the indentation of the enclosing content: |- block scalar. Pre-indenting the file to match keeps the YAML valid no matter what the diff looks like. The Prompt File actions/ai-inference supports .prompt.yml files, a small convention for keeping the system/user prompt out of the workflow YAML. messages: - role: system content: |- You write CHANGELOG entries describing an automated API update to slack-ruby-client, a Ruby gem whose Web API endpoint methods, argument validations, specs, and bin commands are code-generated from vendored Slack API method definitions (via a git submodule and rake task). Given a diffstat and a diff of the regenerated files, respond with ONLY a single JSON object (no markdown code fence ## Upgrading Rails 4.2 to Rails 8: Count Sites, Not Warnings DevFeed: [Upgrading Rails 4.2 to Rails 8: Count Sites, Not Warnings]() Original publisher: [Read original article]() Published: 2026-08-08T00:00:00Z Content type: tutorial Language: en Sources: [Gaurav Sarma's Blog]() Topics: [Rails](), [upgrade](), [version](), [Test coverage](), [RSpec](), [Docker Compose](), [Ruby]() Tags: [coverage](), [docker-compose](), [rails](), [rspec](), [ruby](), [upgrade](), [version]() ### AI overview An account of upgrading a multi-tenant JSON API from Rails 4.2.7.1 to Rails 8. The author argues that estimates focused on version gates missed the actual risks, and describes how characterization tests, an extracted frontend, and containerized development reduced the work. ### Source excerpt . [Upgrading Rails 4... ## Building an agentic harness that outlasts the model DevFeed: [Building an agentic harness that outlasts the model]() Original publisher: [Read original article]() Author: Zack Deveau Published: 2026-07-29T15:30:00Z Content type: article Language: en Sources: [Shopify Engineering](), [Shopify Engineering - Shopify Engineering]() Topics: [Application Security](), [Shopify](), [Vulnerabilities](), [Code review](), [Orchestration](), [pull-requests](), [Rails](), [Ruby](), [web applications](), [Back end]() Tags: [agentic](), [application-security](), [backend](), [building](), [code](), [orchestration](), [pull-requests](), [review](), [ruby](), [shopify](), [vulnerabilities](), [web-applications](), [workflow]() ### AI overview Shopify describes an agentic code review and test-oracle harness for application security. The harness scans software for vulnerabilities, validates findings with real tests, generates Shopify-specific fixes, and opens relevant pull requests. The article also explains its Dispatch orchestrator, parallel scanning workflow, reusable application context, and diff-based follow-up scans. ### Source excerpt We built an agentic code review and test oracle harness that discovers vulnerabilities, proves them with real tests, and provides Shopify-tuned fixes. ## The Fellowship of Code: My Quest at Ruby for Good in Ghent DevFeed: [The Fellowship of Code: My Quest at Ruby for Good in Ghent]() Original publisher: [Read original article]() Author: Fiona McLaren Published: 2026-07-27T14:09:36Z Content type: opinion Language: en Sources: [FreeAgent]() Topics: [Ruby](), [Rails](), [Azure](), [Content Management System](), [Open Source]() Tags: [azure](), [cms](), [coding](), [conferences](), [culture](), [development](), [open-source](), [open-source-code](), [rails](), [ruby](), [ruby-on-rails]() ### AI overview A junior developer describes attending Ruby for Good in Ghent and contributing to SkillRX, a project providing medical education materials in low-resource areas. The team addressed inefficient Azure file-storage synchronization by planning Beacons that communicate directly with the health professionals' CMS. ### Source excerpt It isn't very hard to pitch tech conferences. Offering a getaway from the usual desk work, a chance to pick up on new wisdoms from like-minded and genuinely inspiring folk, and room in the itinerary for sightseeing and socialising in the hip host city in between times? It's a no-brainer... well, for most. I had [...] ## Choosing Among Fable 5, GPT-5.6, and Grok 4.5 for Software Engineering DevFeed: [Choosing Among Fable 5, GPT-5.6, and Grok 4.5 for Software Engineering]() Original publisher: [Read original article]() Author: Jeff Morhous Published: 2026-07-16T11:25:05Z Content type: comparison Language: en Sources: [The AI-Augmented Engineer]() Topics: [Fable](), [Frontier Model](), [AI-assisted coding](), [long-context](), [migration](), [Ruby](), [OpenAI]() Tags: [ai](), [anthropic](), [coding](), [coding-agents](), [frontier-model](), [migration](), [openai](), [ruby]() ### AI overview This comparison examines how software engineers might choose among Fable 5, GPT-5.6, and Grok 4.5. It discusses Fable 5's long-context, adaptive-reasoning, and autonomous-work capabilities, while comparing reported evaluation results, coding performance, and cost considerations across the models. ### Source excerpt Software engineers should be happy that no AI lab can hold the lead for long. I'll walk you through how to choose between Fable 5, GPT-5.6, and Grok 4.5 ## Ruby 3.3.12 Released DevFeed: [Ruby 3.3.12 Released]() Original publisher: [Read original article]() Published: 2026-07-16T05:08:11Z Content type: release Language: en Sources: [Ruby-lang]() Topics: [Ruby](), [releases](), [Release notes](), [Security]() Tags: [2026](), [cve](), [download](), [release](), [release-notes](), [releases](), [ruby](), [security]() ### AI overview Ruby 3.3.12 has been released with security fixes. The update includes erb 4.0.3.1 and net-imap 0.4.25, which fixes multiple listed CVEs, including CVE-2026-42245, CVE-2026-42246, CVE-2026-42256, CVE-2026-42257, CVE-2026-42258, CVE-2026-47240, CVE-2026-47241, and CVE-2026-47242. ### Source excerpt Ruby 3.3.12 has been released. This release includes security fixes. Please check the topics below for details. CVE-2026-41316: ERB @_init deserialization guard bypass via def_module / def_method / def_class This release updates the default gem erb to 4.0.3.1 and the bundled gem net-imap to 0.4.25. The net-imap update fixes CVE-2026-42245, CVE-2026-42246, CVE-2026-42256, CVE-2026-42257, CVE-2026-42258, CVE-2026-47240, CVE-2026-47241 and CVE-2026-47242. Please see the release notes of net-imap v0.4.24 and net-imap v0.4.25 for the details of these fixes. Please see the GitHub releases for further details. Download https://cache.ruby-lang.org/pub/ruby/3.3/ruby-3.3.12.tar.gz SIZE: 21489887 SHA1: 1ecad817a7d3727db65cf898a51d9956888cee5b SHA256: b06d63beae271933033e27f0a389bc582a009e7845357d44365c39de525a051b SHA512: 7c620438e85beb6744acc7d1e917af554238739883d592aa9839fca78514c11e91dfd8c4b5ce611d1ea507a4412ed81f3a8b5fc6eb07ba3e392a77b518de6829 https://cache.ruby-lang.org/pub/ruby/3.3/ruby-3.3.12.tar.xz SIZE: 15891224 SHA1: 7df70ae8a9feb880e2ad5054dfebd712ba03d0eb SHA256: 873e3297990b8cff7a5436f6e510a3a7a18c74e5f2c794e4162e605fe0a743b3 SHA512: 1755901f5d1e66250e4f9f4e3a0bf31ec25055f1cb86fafc68281f6d108e9cf5329a6c74c221b1a31aa7de78e9c2d8aa7b76faf39acfce44c5ed94cf7e766f3f https://cache.ruby-lang.org/pub/ruby/3.3/ruby-3.3.12.zip SIZE: 26954647 SHA1: 8be5a3c6f4a8821ce5326a9e09d4230c9fa06faa SHA256: fc1aecfb45adeb7bebbf9549d45ce6e57f0c9dac8b83cdeb80680de02a83ce41 SHA512: ff5a0339310c464b88a444871f901f41fc735f77668b29dfc70389aae5d44fd90b55cff6c02d47a23596663525b526a86f9906c08c371d37e3fb105ea9c6b1a9 Release Comment Many committers, developers, and users who provided bug reports helped us make this release. Thanks for their contributions. Posted by hsbt on 16 Jul 2026 ## Ruby 4.0.6 Released DevFeed: [Ruby 4.0.6 Released]() Original publisher: [Read original article]() Published: 2026-07-14T01:41:20Z Content type: release Language: en Sources: [Ruby-lang]() Topics: [Ruby](), [releases]() Tags: [2026](), [bugfixes](), [download](), [release](), [release-schedule](), [releases](), [ruby]() ### AI overview Ruby 4.0.6 has been released as a routine update containing bugfixes. The article provides download links and checksums, and says Ruby 4.0.7 is planned for September 2026 and Ruby 4.0.8 for November 2026. ### Source excerpt Ruby 4.0.6 has been released. This is a routine update that includes bugfixes. Please see the GitHub releases for further details. Release Schedule We intend to release the latest stable Ruby version (currently Ruby 4.0) every two months following the most recent release. Ruby 4.0.7 will be released in September, and 4.0.8 in November. If a change arises that significantly affects users, a release may occur earlier than planned, and the subsequent schedule may shift accordingly. Download https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.6.tar.gz SIZE: 23904779 SHA1: bd2b5a5bdf0ac9947eab242f418bef10c8851712 SHA256: 837d299e8f7ddf2be31a229a7a7e019d354979825117989acb3b32b1a9be262a SHA512: 0c050ac9b806facb1e1ec1f6a8def7fc33cf1ccfb57a502b1fc467e76e534e7eaf60297fb08e35e89c8727510903f48c73ccc8f9888a017cd6032379e84ed83e https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.6.tar.xz SIZE: 17968092 SHA1: 1b55f5159fec2bfa08147fc91d23643ab176c009 SHA256: 9c9d121fe3314ea7c801e690b9de981d2b9d12d7849db99c27482468a541ba0a SHA512: c9c391675a098b5a27dd687571ab0a164c788cbb8ddcbab6d17a3e8b3c4ba389346b2e6d7807d38db3e74d225c70e378a296d60d0f465cb0fcec9702242c83c6 https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.6.zip SIZE: 29211551 SHA1: 27609f5815902a5b4dd54d5c8ee798acd90e4efe SHA256: f0f7b0ee34882ab797fc6a88262d19f5783e87f7b984dbc133cfd09c24eefcb6 SHA512: 3a0b87cf6934ec02d84bd5cf9e299904daf3de4625c0fc58781273abb7e0ae1497fc208c82d48fa6203643612c195c5267baa470e517cee179dca82e67104742 Release Comment Many committers, developers, and users who provided bug reports helped us make this release. Thanks for their contributions. Posted by k0kubun on 14 Jul 2026 ## Writing expressive RSpec tests for Ruby objects and Rails views DevFeed: [Writing expressive RSpec tests for Ruby objects and Rails views]() Original publisher: [Read original article]() Author: Simon Fish Published: 2026-07-07T13:26:00Z Content type: tutorial Language: en Sources: [FreeAgent]() Topics: [RSpec](), [Testing](), [Ruby](), [Rails](), [render]() Tags: [rails](), [render](), [rspec](), [ruby](), [ruby-on-rails](), [testing](), [tooling]() ### AI overview The article explains how to use RSpec expressively to separate test phases, clarify expected behavior, and document interfaces. It also discusses why this approach needs adjustment when testing Rails views, which are rendered templates rather than ordinary Ruby objects. ### Source excerpt Using RSpec's functionality expressively helps to draw focus to the right parts of a test, but it's not always easy to understand how best to use it. ## Ruby 3.4.10 Released DevFeed: [Ruby 3.4.10 Released]() Original publisher: [Read original article]() Published: 2026-06-30T12:00:00Z Content type: release Language: en Sources: [Ruby-lang]() Topics: [Ruby](), [releases](), [Security](), [GitHub]() Tags: [2026](), [release](), [releases](), [ruby](), [security](), [sha256]() ### AI overview Ruby 3.4.10 is a regular stable package release that updates the bundled net-imap gem, including security fixes. The release provides source downloads in tar.gz, tar.xz, and ZIP formats with checksums. ### Source excerpt Ruby 3.4.10 has been released. This release is a regular stable package release contains the version update of bundled gem net-imap. The net-imap.gem update contains some security fixes. Please see the release note of net-imap v0.5.15 for the detailed update of net-imap.gem. Please see the GitHub releases for further details. 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Thanks for their contributions. Posted by nagachika on 30 Jun 2026 ## Profiling Performance Bottlenecks in Production DevFeed: [Profiling Performance Bottlenecks in Production]() Original publisher: [Read original article]() Author: Doximity Published: 2026-06-18T12:53:00Z Content type: tutorial Language: en Sources: [Doximity]() Topics: [Ruby](), [Code](), [User Experience]() Tags: [how-to](), [latency](), [performance](), [production](), [profiling](), [ruby](), [time]() ### AI overview This article explains how to use profiling to identify performance bottlenecks in production Ruby applications. It contrasts instrumenting and sampling profilers, emphasizing that sampling has lower overhead and is suitable for production. The article reports that profiling reduced a background job's runtime by about 80%. ### Source excerpt One of our background jobs was so slow that users assumed it was broken. They would kick it off, wander away, knowing it would take ages to complete. Turns out the job was fine. It was just taking its sweet time. We eventually cut its runtime by about 80%, and the fix was so small it was almost insulting. You could have stared at the code for hours and missed it. A profiler found it in minutes. This post is about how to think about profiling so you reach for it at the right moment, not as a first reflex. Performance is a KPI, Not a Vibe It's easy to treat performance as something you tune when someone complains. But latency is a feature, and a slow background job has real downstream costs: a worse user experience, more compute burned, queues backing up, and a quietly growing tolerance for "well, that's just how long it takes." The mindset shift that helped us was treating performance like any other key metric we hold ourselves accountable to. That means it has to be measured, it has to have a number, and that number has to move in a direction we choose on purpose. "It feels faster" is not a result. "p95 went from 214 seconds to 69 seconds on a representative input" is a result. Which raises the obvious question: Once you've decided to take a number seriously, how do you find out where the time actually goes? Profilers, And How They Work A profiler answers one question very well: Inside a single execution of code, where is the time being spent? We can get that answer using one of two broad strategies: Instrumenting (tracing) profilers wrap every method call to record when it starts and stops. You get extremely precise, complete call counts and timings. But the overhead is high, and that overhead can distort the very timings you're trying to measure. Wrapping millions of tiny method calls makes the cheap ones look expensive. Sampling profilers take the opposite approach. Instead of instrumenting every call, they periodically interrupt the program -- say, hundreds of ti [Next page]()