Off the Rails: Patterns for fixing fat models, out-of-controllers, and other Rails problems

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1. Off the Rails Patterns for fixing fat models, out-of-controllers, and

   other Rails problems

2. What I’m about to tell you is wrong.

3. YMMV

4. MVC

5. View Controller Model

6. 3 Tier Architecture

7. Business Logic Presentation Data

8. Business Logic Presentation Data

9. Business Logic Presentation Data View Controller Model

10. Business Logic Presentation Data View Controller Model

11. View Controller Model Business Logic Presentation Data

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15. View Controller Model

16. Model Service View Controller

17. Business Logic Presentation Data

18. Business Logic Presentation Data

19. Business Logic Presentation Data Service

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22. Controller Rule of Thumb A Controller May Contain: • Public

    REST methods • Private before_action setters • Private strong params method

23. Models

24. Business Logic Presentation Data View Controller Model

25. Business Logic Presentation Data View Controller Model

26. Business Logic Presentation Data View Controller Model Repository

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28. Business Logic Presentation Data View Controller Validator Model

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33. –Sandi Metz “duplication is far cheaper than the wrong abstraction”

34. YAGNI

35. Bonus Tip

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38. Thanks for Listening Alexander Clark atheclark alexander-clark.com alexander-clark

39. Further reading • https://codeclimate.com/blog/7-ways-to-decompose-fat- activerecord-models/ • Patterns of Enterprise Application

    Architecture (Fowler) • Domain Driven Design (Evans) • All the Little Things (Metz) https://www.youtube.com/ watch?v=8bZh5LMaSmE • Ruby Object Mapper https://rom-rb.org/

40. Questions?