Paweł Pacana

Curious engineer digging large-scale legacy Rails apps.

@RailsEventStore core and former leader. Organizing @drugpl and @wrocloverb conference.

[Paweł Pacana @mostlyobvious]

@juliknl undo was always an Elm go-to demo

[Paweł Pacana @mostlyobvious]

@5katkov @mbjschirp there's no turning back once infected with mutant, https://t.co/aOKihWsssj is not aiming for less than 100% coverage 😇

[wroclove.rb @wrocloverb]

That’s a wrap on wroclove.rb 2026! What we’ll remember most are the smiles, great discussions, and afterparty vibes. That energy keeps us going – sending a heartfelt thank you to everyone who joined us 🫶

May this postcard bring you all warm memories of wroclove.rb 2026!

[wroclove.rb @wrocloverb]

wroclove.rb kicks off tomorrow! Brace yourselves for a weekend of inspiring talks, fresh ideas, and great energy 🔥

Quick reminders for Day 1:
• Registration → 13:00
• Workshops → 14:00
• Talks → 17:00
• Afterparty → 20:00 🍻

See you soon!

[Paweł Pacana @mostlyobvious]

The conclusion is that DCB support in RailsEventStore is well within reach. The main challenge for an official release would be introducing new APIs without breaking the existing stream-based approach that many production apps rely on.

[Paweł Pacana @mostlyobvious]

I've been exploring Dynamic Consistency Boundary support in RailsEventStore, strongly believing the groundwork was already there:

https://t.co/xr1xx3Wnvg

[Paweł Pacana @mostlyobvious]

In this article I walk through a working proof of concept: a single-file implementation using Postgres SERIALIZABLE isolation to guarantee correctness under concurrent writes. No schema changes required.

[Paweł Pacana @mostlyobvious]

@mbjschirp @rubyconf Big news!

[Jason Zimdars @jasonzimdars]

"...it would be a shame to think of it simply as time to rest-up for more work. Sadly, this is the mindset for many us caught up in a world of pressure, productivity, and, well... more, More, MORE! We've got it wrong if we think of vacations (or even weekends) as a way to recharge for work. To put it another way, we shouldn't be resting so we can work. Work is necessary. Work is important. Meaningful even. Being effective at work matters. But we work so that we may rest. Rest is where the most important things live: families, friends, hobbies, play. The things that feed our souls. Fill yourself with those things and, somehow, you'll also be better at work."

https://t.co/YeJXDPrdtR

[Julik Tarkhanov @juliknl]

Stoked to be showing geneva_drive at Wroclove.rb in April! It's going to be fun (and highly durable too).

[Piotr Ch @p_ch]

And it's live: https://t.co/G2XwPO1e6e

✅ GitHub Actions in your macOS menu bar.

[Paweł Pacana @mostlyobvious]

We design everything on web mobile-first… except code samples. Here’s a look at three approaches: clever, boring and something in between.

A tour of Ruby on WebAssembly, Hotwire with Turbo Frames and something @maciejkorsan would be proud of.

https://t.co/v8PJ2X5Lyg

[wroclove.rb @wrocloverb]

You already know @_m_b_j_ from his mutation testing workshop that he will run at #wrocloverb. And now he’s stepping on stage as a speaker too 🎤

Markus will give a talk titled “My core skill never was the typing” - expect sharp insights and plenty of food for thought.

[Szymon Fiedler 🇵🇱 @szymonfiedler]

Blogged

[Paweł Pacana @mostlyobvious]

@blueridgeruby Email invitations broke several months ago and could get any response via support nor @papercall_io

[wroclove.rb @wrocloverb]

Ready to get hands-on with mutation testing?

@_m_b_j_ joins us to run a "Setup and operation of mutation testing in agentic world" workshop. As the author of Mutant, a mutation testing tool for Ruby, there’s no better person to guide you through it 🔥

Gonna be a good one!

[Lucian Ghinda @lucianghinda]

Have you noticed how great the Ruby docs looks like for the master?
https://t.co/uSMeztvnOp

Thank you @_st0012 and the entire team contributing to RDoc for these improvements.

[Paweł Pacana @mostlyobvious]

Do I know someone who knows someone behind @papercall_io?