Below are the slides of my talk “CQRS & Event Sourcing in the wild”, as presented at ScotlandPHP 2016.
Requirements and applications evolve and change, leading to refactoring. For example, user registration now requires a first and last name, what was once an error may no longer be considered one, etc. In an event sourced application, that poses a few problems. In this post I’ll discuss a few strategies and my views on event versioning.