The Decide, Evolve, React pattern in Ruby - Ismael Celis

The Decide, Evolve, React pattern in Ruby, explained step by step. It optionally provides a lossless audit trail of changes, and the seeds of a pub/sub sub-system, by tying together events to the state changes they cause. It’s a generalisation of the Event Sourcing pattern, but it doesn’t require a log of events or a replay mechanism, and can be readily leveraged by traditional CRUD systems.