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Storing data as a sequence of events (RubyConfAt)

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Avatar for Łukasz Reszke Łukasz Reszke
May 31, 2026
Programming
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Storing data as a sequence of events (RubyConfAt)

Avatar for Łukasz Reszke

Łukasz Reszke

May 31, 2026

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Transcript

  1. Helping Rails apps since 2007 a boutique consultancy specializing in

    Ruby expertise

  2. Relational Database

  3. CRUD

  4. Change = State Overwrite

  5. Admit.

  6. Information is lost

  7. WHAT IT IS NOW

  8. HOW WE GOT THERE

  9. HOW WE GOT THERE

  10. Alternative for saving data as snapshot

  11. Storing state as sequence of facts

  12. Facts == Events

  13. Event Sourcing

  14. ONE THING TO REMEMBER FROM THIS PRESENTATION

  15. Event Sourcing is just another persistence technique.

  16. Event

  17. Events are kept in Event Store

  18. Append only log

  19. Immutable

  20. Event <-> Stream

  21. None
  22. None
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  24. None
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  26. None
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  34. HOW WE GOT THERE?

  35. None
  36. None
  37. None

  38. One to Many

  39. Load the state Make decision Publish an event (new state)

  40. Consolidate events into streams to answer interesting business questions

  41. None
  42. None
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  44. None
  45. None
  46. None
  47. None
  48. None
  49. None
  50. None
  51. None

  52. Event Store… DB?

  53. Rails Event Store Backed up and maintained by

  54. Started in 2015

  55. Based on Database that you already use

  56. Two Tables Events and Events in streams

  57. Comes with migrations

  58. Comes with event browser

  59. Case - Warehouse

  60. Shipment

  61. Packing

  62. Mistakes happen

  63. Information?

  64. shipment.status == :packed

  65. So it’ll be billed for packing…

  66. So it’ll be billed for packing… Once

  67. Demo

  68. Benefits - State change history recorded as sequence of events

    - ZERO DATA LOSS - Auditability - Reconstructing state - Makes debugging easier

  69. Check it out at railseventstore.org

  70. THANK YOU! Łukasz Reszke