[EN] DDD in Ruby on Rails - Aggregate Pattern - Paweł Strzałkowski

Video from the fourth edition of Domain-Driven Design webinar hosted by Visuality, with presentation by Paweł Strzałkowski. The speaker shows how to use DDD's aggregate pattern in a Ruby on Rails application. The covered topics include: - an eventful story about Christmas elves and their struggle with work burnout - dealing with race conditions - aggregate pattern - optimistic and pessimistic locking - how and when to use aggregates in Ruby on Rails applications - eventual consistency Additional links: - Domain-Driven Designed Ruby Discord https://discord.com/invite/VjdrCYgYcK Presentation plan: [0:00] Introduction [3:51] Story of Christmas Elves [5:18] Task which need aggregates [5:47] Multi-user system requirements [7:27] Flawed, Service Object solution [7:56] What is a race condition? [9:25] Fix for the race condition [11:25] Task which needs aggregates [12:02] Database / ActiveRecord / Service Object level solutions [16:37] Discovery of Domain-Driven Design [17:13] Introduction to Domain-Driven Design Aggregate [20:40] Examples of aggregates [26:30] Aggregate based solution in Ruby on Rails [28:10] Pessimistic locking [30:35] Optimistic locking [34:07] Optimistic and Pessimistic locking in Ruby on Rails [37:00] Aggregate based solution in Ruby on Rails with locking [38:10] DDD online conversation announcement [40:36] Eventual consistency between aggregates [45:00] ActiveRecord vs PORO [46:42] Summary [48:40] Q&A [51:00] Visuality presentation Authors: Paweł Paweł Strzałkowski Visuality talks: Y20W[...] ____________________________________________ ► Looking for a dedicated software development team? Contact us at: https://www.visuality.pl/ ► SUBSCRIBE to learn more about software development: http://bit.ly/SubscribeVisuality http://bit.ly/SubscribeVisuality http://bit.ly/SubscribeVisuality ► Read what clients say about us on Clutch.co: https://clutch.co/profile/visuality ► Find us here: Instagram: https://www.instagram.com/visuality.pl/ Facebook: https://www.facebook.com/visualitypl Linkedin: https://www.linkedin.com/company/visualitypl/ X: https://twitter.com/visualitypl Dribble: https://dribbble.com/VISUALITY GitHub: https://github.com/visualitypl