Architecture Over Framework: Rethink Your App Structure

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Architecture Over Framework Rethink Your App Structure

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Tweet@_swanand GitHub@swanandp StackOverﬂow@18678 Build { Simplero } swanand@pagnis.in Ruby, Clojure, Lisp, Rails, Android, Emacs, TextMate, RubyMine, Minitest, MySQL, Zsh, Curl, Gmail, Hadoop, Mavericks, Solarized, Retina-MBP, Nexus 5 Oscar Wilde, Robert Jordan, J K Rowling, Quentin Tarantino, Chris Nolan, Leonardo DiCaprio, Charlize Theron, Metallica, Dream Theatre, Pink Floyd

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! if magic_code puts "I am in IF block" else puts "In ELSE block I am" end ! => I am in IF block => In ELSE block I am how?

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! if fork puts "I am in IF block" else puts "In ELSE block I am" end ! => I am in IF block => In ELSE block I am how?

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Looking Ahead Why do this ? Case Study: Discourse

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Looking Ahead Why do this ? Case Study: Discourse

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Why do this ? Clear Intent Better Understanding

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Why do this ? Clear Intent Better Understanding

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Architecture Elements of a system and their relationship with each other

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Architecture Designed such that intent is apparent and palpable

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Framework An abstraction you build upon, to provide app speciﬁc software

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This picture screams RAILS!

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–Robert Martin “This is good for DHH; but not So good for you.” http://www.confreaks.com/videos/759-rubymidwest2011-keynote-architecture-the-lost-years

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Why do this ? Clear Intent Better Understanding

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Debugging bad code: Frustration

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Debugging good code: Enlightenment

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Debugging good code: Learning

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Looking Ahead Why do this? Case Study: Discourse

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That’s not a lot, but if you are new to the project, then …

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http://media0.giphy.com/media/KE9cblgPK6EPS/200_s.gif

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Before

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After

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File lookups are ﬁxed by managing load path

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Const lookups are ﬁxed by managing auto-load path

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config/application.rb

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$ rails console

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$ rails console

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http://38.media.tumblr.com/tumblr_maeu8e5wuj1rxmai6o1_500.gif

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First real limitation: namespace based look ups

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application_controller

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Second limitation: unfriendly helper customisation

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Second limitation: unfriendly customisation

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action_controller/helpers

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rails/railtie

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config/helper_railtie

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Looking Back File structure (Load Path) Const lookups (Auto Loads) View Paths (Namespacing) Helper Paths (Railties)