Setting up projections

Recipes for the two flavors of projection — virtual and persistent — distinguished by where the projected state lives. The Projection concept introduces the choice; the recipes here show how to set each one up.

  • Virtual — projection that materializes state in memory only, recomputed on demand from the events - ideal for consistency checks
  • Persistent — projection that materializes state to a durable store: an ActiveRecord row in a Funes-shaped table by default, or any custom destination (S3, Redis, search index, external API)

Table of contents

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