Andrzej Śliwa walks through a Rails + rails_event_store implementation of CQRS and event sourcing, covering EventStorming with business experts, bounded contexts, dry-struct command forms, aggregates, sagas, event versioning/upcasting, denormalizers/read models, error-handling strategies, and learning via mind maps. Q&A covers infrastructure maintenance cost, boilerplate/generators, and convincing product managers via EventStorming.
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