Taming BIG Rails Applications with Component Based Architecture

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BIG Rails Applications Taming

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@jwright

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A Story

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4795 lines of code 108 classes 23 controllers 66 models 1:38 test time

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Directory Structure

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Search Market Product Search Results Product Photos Market Photos Market Culture Product Liﬆ Sign Up Sign In Password Reset Profile Payment Processing Purchase Hiﬆory Ticket Selector Cart Checkout Orders Reservations

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OneGiant App

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TooMuch for your head

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New Functionality??

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Small Large apps app a lot one

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Rails Engines

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rails plugin new [name] —mountable

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> app > config > db > lib > log > vendor > engine_name

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> Gemfile > Rakefile > app > bin > config > lib > test > engine_name

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Build Walls

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Gives Box you a to talk about

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More Maintainable

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Example

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app/models/review.rb

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app/models/offer.rb

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db/migrate/_create_reviews.rb

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spec/integration/models/review_spec.rb

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app/views/tours/_reviews.html.erb

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app/views/tours/_review.html.erb

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1. Namespace

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Ebert

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mkdir app/models/ebert mv app/models/review.rb app/models/ebert

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app/models/ebert.rb

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app/models/ebert/review.rb

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app/models/offer.rb

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mkdir spec/integration/models/ebert mv spec/integration/models/review_spec.rb spec/integration/models/ebert

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spec/integration/models/ebert/review_spec.rb

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spec/factories/reviews.rb

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2. Concern

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app/models/offer.rb

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app/models/ebert/reviewable.rb

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app/models/ebert.rb

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app/models/offer.rb

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app/models/ebert/review.rb

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app/models/ebert/review.rb

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app/models/ebert.rb

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3. Engine

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mkdir components rails plugin new ebert —mountable mv ebert components

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> Gemfile > Rakefile > app > bin > config > lib > spec > ebert > app > components

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Gemfile

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mv app/models/ebert/review.rb components/ebert/app/models/ebert

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mv app/models/ebert/reviewable.rb components/ebert/app/models/ebert

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components/ebert/lib/ebert.rb

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components/ebert/lib/ebert/engine.rb

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mv app/views/tours/_reviews.html.erb components/ebert/app/views/ebert mv app/views/tours/_review.html.erb components/ebert/app/views/ebert

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app/views/tours/show.html.erb <%= render partial: ‘ebert/reviews’ %>

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rm -rf app/models/ebert rm app/models/ebert.rb

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4. Move Teﬆs

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components/ebert/ebert.gemspec

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mv spec/integration/models/ebert/review_spec.rb components/ebert/spec/integration/models/ebert/

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mv db/migrate/_create_reviews.rb components/ebert/db/migrate

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components/ebert/lib/ebert/engine.rb

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Fin

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Considerations

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rake bundle:all

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rake test:suite:all

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gem ‘search’, path: ‘components/search’

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Way of the Future

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/features Wrapper App Common Search Markets Products Registration Reservations API Orders User Photos Ebert

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Resources

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http://bit.ly/1onMOOf Midwest Ruby Conf 2013 - Component Based Architecture in Rails [video]

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http://bit.ly/1tAMguy Rocky Mountain Ruby 2013 - How I Architected my Big Rails App [video]