Refactoring Rails applications with RubyMine
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The document discusses typical problems encountered in Rails applications such as hidden dependencies and security bugs, and proposes new patterns for refactoring using RubyMine. It emphasizes a shift from implicit to explicit guidelines and introduces building blocks like service objects and repositories. The presentation also highlights the benefits of quick feedback loops in development and the importance of refactoring for maintaining application health over time.
Refactoring Rails applications with RubyMine
- 1. Refactoring Rails apps with RubyMine Andrzej Krzywda Arkency
- 2. Andrzej Krzywda • Arkency • Rails since 2004 • hundreds of Rails projects reviewed
- 3. Agenda • Typical Rails problems • Beyond The Rails Way - new patterns • Refactoring recipes with RubyMine
- 4. Rails is great • In the first month of development • Quick results in almost no code • Quick feedback loop • Predictable speed • Your customer loves you • You love Rails
- 6. Typical Rails problems • MVC is not enough • first regression bugs • slow tests • slower progress
- 8. Typical Rails problems • hidden dependencies • implicit assumptions (aka Convention over Configuration) • security bugs! • Rails upgrades are now projects on their own with (huge) budgets
- 11. Any questions so far?
- 12. New guidelines • explicit > implicit • reducing meta • more building blocks
- 13. New patterns • Inspired by: • DDD • Hexagonal Architecture • DCI • CQRS/Event Sourcing
- 14. The building blocks • Service objects • Repositories • Adapters • Form objects • Domain objects • RubyMine
- 16. Extract a service object • the gateway drug • a training in refactoring • turn a controller action into a method object
- 17. Questions?
- 18. Typical controller coupling • new-action uses the ‘new’ view • create-action uses the ‘new’ view • edit-action uses the ‘new’ view • ‘new’ view uses _form partial • ‘edit’ view uses _form partial • ‘edit’ action uses ‘edit’ view • ‘update’ action uses ‘edit’ view
- 20. The filters algebra • Filters depending on each other • The order is important • Hard to decouple • communication via @ivars
- 21. At the controllers/views level everything is communicating with each other via @ivars
- 22. Everything is depending on instance variables
- 23. Controller instance variables are the global, mutable state
- 24. the Redmine project • a project management tool • contains a time-tracking module • http://www.redmine.org/projects/redmine/wiki/ RedmineTimeTracking • since 2007 • https://github.com/redmine/redmine
- 28. RubyMine coding • look at the existing concerns • run the subset of tests • keep refactoring
- 30. Summary • Typical Rails problems • Refactoring example • RubyMine support
- 32. Fearless Refactoring: Rails Controllers Today 20% off with the JETBRAINS coupon code! http://rails-refactoring.com