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Extraindo a regra de negócio para uma nova camada

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Avatar for Gabriel Sobrinho Gabriel Sobrinho
May 10, 2012
Programming
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Extraindo a regra de negócio para uma nova camada

Apresentado no Rails-MG em 2012

Avatar for Gabriel Sobrinho

Gabriel Sobrinho

May 10, 2012
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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?

  10. None
  11. None

  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
  15. None

  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

  39. None

  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

  42. None

  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

  45. None

  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!