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Separando as regras de negócio do Rails
Celso Crivelaro@celsocrivelaro
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DEVELOPER @
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Rails revolucionou frameworks MVC
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Convenção sobre Configuração
Muitos plugins / gems
Documentação
Baixo tempo para subir um projeto
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Mas não são todos que
concordam...
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Onde está o problema?
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Sua App não é o Rails
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Controller
Model
View
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View não é só HTML
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Model não é ActiveRecord
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Comunidade Ruby se preocupa
pouco com Arquitetura OO
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account.rb 439 linhas
account_spec.rb 1045 linhas
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Dificuldades no upgrade de versão do Rails
Má arquitetura torna os testes difíceis
Alterações no software são caras
Difícil de dividir a app em várias
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Como podemos desacoplar?
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Views
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Entrada de dados
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controllers/users_controller.rb
views/users/new.html.erb
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controllers/users_controller.rb
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Fácilmas problemático
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Cadastro em passos
Formulário preenche vários modelos
Diferentes interfaces: Web + API
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https://gist.github.com/peternixey/1978249
Mass Assignment => Strong Parameters
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Form Objects
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forms/user_form.rb
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controllers/users_controllers.rb
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Exibição de dados
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Presenter Objects
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controllers/users_controllers.rb
presenters/user_show_presenter.rb views/users/show.erb.html
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Mock nos testes
Favorece Duck-typing
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Models
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ActiveRecord
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ORM
Regras de preenchimento
Quanto menos regras de negócio melhor
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Evite usar callbacks
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Regras de Consulta
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Policy Objects
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Tem sentido levar estes métodos para todo lado?
Métodos de checagem / permissionamento
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policies/user_policy.rb
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http://ruby-doc.org/stdlib-2.3.0/libdoc/forwardable/rdoc/Forwardable.html
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Regras de Ação
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Service Objects
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Métodos de ação
Usa vários modelos
Lógica de negócio complexa
Usa várias integrações
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services/user_billing_service.rb
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Invocando alguns Design Patterns
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Pipeline /Chain of
Responsibility
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Strategy
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Dicas Finais
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Estude muito OO
Estude arquitetura OO
Desacople o seu código
Tente fazer algo sem o Rails
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Referências
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http://solnic.eu/2016/05/22/my-time-with-rails-is-up.html
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http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/
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Obrigado!
@celsocrivelarohttp://crivelaro.me