Exploring Rails anti-patterns
summary
A small Rails 7 app exists to prove each example actually works: controllers move business logic into a service object (placed order) and password resets live in a PasswordsResetController; long ActiveRecord queries become scopes or query objects and N+1s disappear by using includes and eager loading; performance finds come from the bullet gem and strict_loading or Rack Mini Profiler; null objects, presenters/decorators and delegate reduce view coupling; callbacks that hit external systems become background jobs or timed Faraday calls (timeout cut from 60s to 3s); tests cover refactors and delegation.
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chapters (20)
- 0:00Introduction
- 1:49Anti-patterns and refactoring
- 2:52Fat controllers and logic
- 6:44Non-standard controller actions
- 8:30Separate controllers for actions
- 10:19Spaghetti SQL and Active Record
- 11:24N+1 queries and eager loading
- 14:32Law of Demeter and coupling
- 16:21Null object pattern for nil
- 19:11Overloaded views and presenters
- 22:43View helpers and view models
- 25:57Strict locals and magic comments
- 27:47Fat models and God objects
- 30:15Breaking down large models
- 31:44Rails callbacks pitfalls
- 33:30Service objects instead of callbacks
- 34:58Concerns vs pure Ruby objects
- 36:25Testing delegation
- 37:08Slow API calls and background jobs
- 38:18Summary
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