Question 1

How do I migrate events when my domain model changes in Rails Event Store?

Accepted Answer

RES supports event upcasting and transformations through contributed gems like ruby_event_store-transformations. You can version events and apply migrations during replay, but it requires careful planning to avoid data loss and ensure backward compatibility.

Question 2

Rails Event Store or Kafka for event-driven architecture?

Accepted Answer

RES is ideal for within-application event handling, audit trails, and event sourcing in Rails, while Kafka excels at cross-service streaming and high-volume data pipelines. Use RES for domain events inside your app and Kafka for system-wide integration.

Question 3

How to set up asynchronous event handlers with Sidekiq?

Accepted Answer

RES integrates with Sidekiq via the ruby_event_store-sidekiq_scheduler gem. Configure handlers to run in background jobs by subscribing with asynchronous options, ensuring non-blocking event processing and better scalability for side-effects.

Question 4

Can Rails Event Store work with JSONB columns in PostgreSQL?

Accepted Answer

Yes, since RES uses ActiveRecord, you can store event data in JSONB columns for flexibility. The default schema allows customizing storage, but you may need to adjust migrations to leverage JSONB features effectively.

Question 5

What's the performance impact of using Rails Event Store on high-traffic apps?

Accepted Answer

Event storage adds write overhead, but RES is optimized for Rails and can scale with database tuning. For read-heavy scenarios, use read-models to cache projections and avoid querying the event log directly, which can mitigate performance hits.

Question 6

How does event sourcing with RES handle concurrency issues?

Accepted Answer

RES provides optimistic concurrency control through event versioning and aggregate roots. When saving aggregates, it checks for conflicts using version numbers to prevent lost updates, ensuring consistency in concurrent environments without locking.

aggregate_root

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