How to write a good scalable code. 7 patterns to refactor fat model.

1. @gotar | @oskarszrajer gotar.info
Oskar Szrajer

2. Beyond MVC
(How to write a good code)

3. MVC
(Model View Controller)

6. Fat controller

7. Fat model

8. identifying problems
• long files (classes)
• SRP (Single Responsibility Principle)
• Law of Demeter (Principle of Least Knowledge)
• complex tests
• callbacks

9. 7 patterns to help You
• Value Objects
• Service Objects
• Form Objects
• Query Objects
• View Objects
• Policy Objects
• Decorators
http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/

10. Service Objects

11. class ResetPassword
attr_reader :id
def initialize(id)
@id = id
end
def call
...
end
end
ResetPassword.new(1).call

12. class ResetPassword
attr_reader :id
def initialize(id)
@id = id
end
def call
...
end
def self.call(*p)
new(*p).call
end
end
ResetPassword.call(1)

13. Q&A
@gotar | @oskarszrajer gotar.info

14. Summer 2016 Interns
http://summer2016.ragnarson.com/

15. TRUG
(Trójmiasto Ruby User Group)
http://trug.pl

16. Thx
@gotar | @oskarszrajer gotar.info