Abuse the abusable ActiveRecord ...NOT!

We all know that Rails's ActiveRecord is so powerful. By DHH's definition, it's God-like, in this talk I am going to show how to abuse it to solve a simplified usecase of claim lodging. And then show you how to get it right without ActiveRecord!

Transcript

1. Abuse the abusable ActiveRecord
2. @joneslee85 http://ruby-journal.com Trung Lê
3. @joneslee85 http://ruby-journal.com Trung Lê Chào!
4. What is ActiveRecord?
5. Validation Aggregation Callbacks Association Inheritance Hierarchies Transaction Logger Agnostic
 Schema Domain Logic MAGICAL
6. It can drive racing car or wash dishes for you!
 I am SERIOUS!
7. Great power comes great abuser!
8. Let's bully AR!
9. Insurance Claim Lodge
10. Claim Claim $ Claim Client Insurance
 Company
11. Claim Eligible? $ $ Claim Eligible? $ $ Claim Eligible? $ $
12. Here's Plan A
13. ClaimA #valid? ClaimB #valid? ClaimC #valid? #save! true false false false #errors.add #errors.add #errors.add Claim STI Validation #set_amount true true #set_amount #set_amount Callbacks
14. Yes, I could code this under 10 min!
16. Thank you Question?
17. Sorry, it's not finished!
18. What!? Are you
 trolling around?
20. Abuse the abusable ActiveRecord
22. What's wrong?
23. • So many responsibilitties • Prone to regressions • Persistence Locked • Hard to write test • SLOWWW test • STI?! Gosh NO! • Domain logic mixed
24. Do it right for the sake of reputation
25. PORO BRO! (Service Object, Delegator or Strategy pattern)
26. ClaimTemplator ClaimEligibilityValidator ClaimLodger
27. Enlighten-fu! No callbacks!
 No STI!
 No Domain Logic! (No DHH)
28. Checking for Claim Eligiblity
29. Checking for Claim Eligiblity
32. No Rails == fast! No persitency with double! == fast Consistent and easy to test
33. Populate Claim Attributes
34. Claim Lodger aka Claim Creator
35. The Lean Way • NO DHH! - Think before you listen to him • Only data persistence & validation & assoc. in AR • Split to services • Simplicity over Convention and Convenience
36. @joneslee85 http://ruby-journal.com Trung Lê Cảm ơn! Question?