RailsConf 2022 - Reflecting on Active Record Associations by Daniel Colson

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Confreaks

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Published on January 16, 2023 4:00:06 PM ● Video Link: https://www.youtube.com/watch?v=ImwNMYjRMSg

Duration: 32:03

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Active Record associations seem magical—add a has_many here, a belongs_to there, and suddenly your models are loaded with behavior. Could it be magic, or is it plain old Ruby with some thoughtful design and a bit of metaprogramming? In this talk we'll study Active Record associations by writing our own belongs_to and has_many macros. We'll dynamically define methods, cache query results, replace a a Relation with a CollectionProxy, and automatically prevent N+1 queries with inverses. You'll leave with a deeper understanding of associations, and a new appreciation for their magic.