Event Sourcing with Rails from scratch

In the previous article Introduction to Event Sourcing and CQRS we got familiar with the main concepts of Event Sourcing and reviewed the cons and pros of this approach.Implementing Event Sourcing in Rails can be a powerful way to handle complex business logic and maintain a reliable audit trail of changes to your application's state. Event Sourcing involves storing a sequence of events that represent changes to the state of your application over time.Now, before we plummet into using Event Sourcing in Rails with help or battle-tested solutions, let's research the basics and learn how to implement things from scratch. However, be aware - you should think twice before using custom implementation (too many chances you going to miss some small detail and the consequences may be huge). For these purposes let's create a simple application for listing rental advertisements on the website.