In this talk I would like to show some cool Rails features like model callbacks, active record relationships, concerns, and MVC pattern that can make your application into a coupled monolith, hard to test and to get rid of dependencies. For each case, use simple concepts of Clean Architecture to solve elegantly and decoupled.

1. HOW TO NOT CREATE AN
UNBREAKABLE RAILS
MONOLITH

2. @wwwbruno
ABOUT ME
BRUNO ALMEIDA
Hometown @ Lages, Brazil
Ruby Engineer @ Event Inc
Go, Rails, Docker and Open Source lover

3. TOPICS
1. MVC on Rails
2. Clean Architecture
3. Rails code Examples

4. OBJECTIVE
Share experience with problem using Rails
“Architecture”
Show another point of view, that is also not
perfect
“What can I do better?”

5. INSPIRATION
UNCLE BOB

6. 1. MVC
ON RAILS

7. WHAT IS RUBY ON RAILS?"Rails is a model–view–controller (MVC)
framework" Wikipedia

8. WHAT IS MVC?

9. TRYGVE REENSKAUG

11. WHAT IS WEB?

12. WEB IS ONLY A DETAIL

13. 2. CLEAN
ARCHITECTURE

15. FRAMEWORKS AND DRIVERS
SMALL DETAILS LIKE DATABASE AND WEB

16. INTERFACE ADAPTERS
CONVERT DATA TO USE CASES AND EXTERNAL
AGENCIES

17. USE CASES
APPLICATION SPECIFIC RULES

18. ENTITIES
GENERAL AND HIGH LEVEL RULES

19. CROSS BOUNDARIES
DATA STRUCTURE

20. WHY USE CLEAN CODE
ARCHITECTURE?

21. DEPENDENCY

23. BETTER TO MAINTAIN, TEST, CHANGE, DEBUG…

24. HOW EASY IS TO CHANGE RAILS TO SINATRA?

25. AND FROM A CONTROLLER TO A SIDEKIQ JOB?

26. 3. RAILS CODE
EXAMPLE

27. DISCLAIMER

28. SIMPLE TASK
- Create a user
- Validate name presence
- Validate email presence and uniqueness
- Send email after create

30. UsersController User WelcomeMailer
Validations

31. PO REQUEST
- Create user without sending email on Admin
- Send email to existent user on Admin
- Create user without password on Admin

34. UsersController User
WelcomeMailer
Validations

39. UsersController UserService
WelcomeMailer
Validations
User

40. LOOK FOR
RUBY MIDWEST 2011 - KEYNOTE:
ARCHITECTURE THE LOST YEARS BY
ROBERT MARTIN

41. LOOK FOR
THE CLEAN ARCHITECTURE

42. LOOK FOR
CLEAN ARCHITECTURE: A CRAFTSMAN'S GUIDE TO
SOFTWARE STRUCTURE AND DESIGN (ROBERT C.
MARTIN SERIES)

43. THANK YOU
Resources
https://8thlight.com/blog/uncle-bob/2012/08/13/the-clean-architecture.html
https://www.youtube.com/watch?v=WpkDN78P884
https://blog.arkency.com/2014/04/mastering-rails-validations-contexts/
https://blog.arkency.com/2014/05/mastering-rails-validations-objectify/
BRUNO ALMEIDA
github.com/wwwbruno
linkedin.com/in/wwwbruno
brunom.almd@gmail.com