I’ve just published a new repo, a side project where I’m experimenting with Event Sourcing, CQRS, and the Ecotone framework in a Symfony 7 environment.

This is a personal learning project, not something production-ready. The goal is to better understand how to design event-driven systems in PHP using real-world structures like aggregates, value objects, and projections. As a playground, I’m building a turn-based strategy game (inspired by Civilization) -just enough to have a meaningful domain to model.

Right now, the repo includes:

• Symfony 7.3 backend with Ecotone (commands, events, projections),
• Early frontend setup using Vite, Symfony UX and PixiJS for rendering a hex map,
• A bunch of evolving domain logic for turns, players, and cities.

Again – this is an experimental setup for learning, so expect the code to change frequently. But if you’re also exploring Ecotone or curious how event sourcing might work in a Symfony project, feel free to check it out, leave feedback, or just follow along.

github.com/ernestwisniewski/symfony-of-ages

In an event-sourced architecture, the entire history of changes to the application’s state is stored as a sequence of events. However, to effectively work with this data, we often need optimized read models. This is where projections come into play. In today’s post, I’ll show you how to set up and implement projections in Ecotone, allowing you to easily transform events into the current state of your system.

(more…)