Extraindo a regra de negócio para uma nova camada

Apresentado no Rails-MG em 2012

Transcript

1. Extraindo a regra de negócio para uma nova camada
2. @sobrinho • software architect @ nohup • https://github.com/sobrinho
3. Fat Controllers
4. Fat Models
5. Qual é o problema com essas abordagens?
6. Nenhum!
7. Por que pensar binário?
8. Se cada caso deve ser analisado individualmente...
9. Quem nunca fez um código macarrão?
12. Vamos fazer uma pequena aplicação
13. Eu preciso cadastrar meus contratos e seus itens
14. E também preciso cancelar os itens individualmente, salvando a data do cancelamento
16. Rails Rails é um framework web full-stack Model-View-Controller (MVC)
17. Contractus ~/Code (1.9.3-p0) 21:08:25 $ rails new contractus ... create app/controllers create app/models create app/views ...
18. Contractus ~/Code (1.9.3-p0) 21:08:25 $ rails new contractus ... create app/controllers create app/models create app/views ...
19. Contractus ~/Code (1.9.3-p0) 21:08:25 $ rails new contractus ... create app/controllers create app/models create app/views ...
20. Contractus ~/Code (1.9.3-p0) 21:08:25 $ rails new contractus ... create app/controllers create app/models create app/views ...
21. Contractus ~/Code (1.9.3-p0) 21:08:25 $ rails new contractus ... create app/controllers create app/models create app/views ...
22. Contractus ~/Code (1.9.3-p0) 21:08:25 $ rails new contractus ... create app/controllers create app/models create app/views ...
23. Contractus ~/Code (1.9.3-p0) 21:08:25 $ rails new contractus ... create app/controllers create app/models create app/views ...
24. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
25. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
26. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
27. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
28. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
29. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
30. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
31. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
32. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
33. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
34. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
35. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
36. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
37. Contractus ~/Code/contractus (1.9.3-p0) (master) 21:10:52 $ rails generate scaffold contract name:string 21:21:49 $ rails generate scaffold item contract:references name:string price:decimal canceled_at:date
38. Fat Controller
40. ~/Code/contractus (1.9.3-p0) ((v0.1.0)) 07:28:35 $ time rspec spec/controllers ................................. Finished in 0.42347 seconds 33 examples, 0 failures real 0m7.831s user 0m3.328s sys 0m0.651s
41. Fat Model
43. ~/Code/contractus (1.9.3-p0) ((v0.2.0)) 02:28:40 $ time rspec spec/models . Finished in 0.02556 seconds 1 example, 0 failures real 0m3.048s user 0m2.621s sys 0m0.413s
44. Business
46. ~/Code/contractus (1.9.3-p0) ((v0.3.0)) 02:29:59 $ time rspec spec/business . Finished in 0.00072 seconds 1 example, 0 failures real 0m0.535s user 0m0.397s sys 0m0.088s
47. Fluxo mais simples Controller x Business x Model
48. Testes isolados Regra de negócio não deve depender de absolutamente nada para ser testada
49. Manutenção fácil Como proceder se somente os itens das últimas 24h puderem ser cancelados?
50. Dúvidas?
51. Obrigado!