An ActiveRecord Rewrite - The Story Behind the Attributes API

Explore the design decisions and development story behind ActiveRecord's Attributes API in this 19-minute conference talk from RailsConf 2025. Dive deep into the technical constraints and tradeoffs that shaped this foundational component of ActiveRecord, hearing directly from the API's author about their journey from initial project idea to a complete ActiveRecord refactoring. Discover how this under-the-hood system works and understand the complex engineering decisions that went into its creation, gaining insights into a critical piece of Rails infrastructure that every ActiveRecord user relies on, regardless of prior knowledge about the Attributes API itself.