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Big Rails

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https://github.com/josh-jacobson/Wedloom

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Refactoring towards Component- based Rails Architectures Stephan Hagemann ! Pivotal Labs Boulder, CO

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Component-based Rails architectures

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#cbra

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github.com/shageman/the_next_big_thing

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Teaser Email Signup Annoyance Event Counter Rails Container

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Proxy Partner API Rails Container Registration Internal API

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Availability and Booking Rails Travel Site Payment Gateway Conversion Tracking

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Rails TV Shows with Social Network Global Admin Show Admin SMS Interface Social Network Publisher Admin UI Users and Channels

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WAT?

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Because it helps

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How to write #cbra? github.com/shageman/the_next_big_thing ! http://pivotallabs.com/tag/rails-application-suites/ ! confreaks.com/presenters/790-stephan-hagemann confreaks.com/presenters/784-ben-smith ! https://leanpub.com/cbra

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Big Rails

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How Big? find . -iname "*.rb" -type f -exec cat {} \; | wc -l

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How Big? gist.github.com/shageman/11185993

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Growing size

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Exploding complexity Size Possible Interactions

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Versions of Large VS

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Size Possible Interactions Reduced (Exploding) complexity

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the rich get richer and the poor get

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- “Ain't We Got Fun?” - Gus Kahn, Raymond B. Egan the rich get richer and the poor get—children!

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Preferential Attachment

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Entities (sorted by size) Size

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Big Open-Source Rails Apps browsercms! calagator! canvas-lms! citizenry! diaspora opencongress! opengovernment! portlandcrime! railscollab! rubygems.org locomotivecms! fat_free_crm! fulcrum! loc_counts! onebody skyline! snorby! spot-us! spree! teambox tracks

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What About Code? find . -iname "*.rb" -type f -exec wc -l {} \; | sort -rn

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What About Code? https://gist.github.com/shageman/11190909

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user.rb

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ActiveRecord Associations

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has_many

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users model

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id name home 1 Kate Chicago 2 Pete Boulder 3 Ian Boulder 4 Sam Chicago users table users model

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id name code 1 red #FF0000 2 green #00FF00 3 blue #0000FF 4 yellow #FFFF00 colors table colors model

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How many has many? ack " has_many " -c | awk -F ":" '{print $2,$1}' | grep -v "0" | sort -rn

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How many has many? https://gist.github.com/shageman/11191030

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user.rb

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we can do better

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SOLID

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Single Responsibility Principle

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Things that don’t belong

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SRP - where? Method Class Module Yes! Yes!

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SRP - where? Method Class Namespace Yes! Yes!

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Mixins

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SRP - where? Method Class Namespace Component Application Now you can! Yes! Yes! You should! … Anyone? You should!

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Components over SOAs 1 repo 1 test suite (and splittable!) 1 deployment no additional versioning constraints easier refactorings between parts

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Within a SOA componentize your apps

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Refactoring towards #cbra

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Teasing out App Component Extracting Functional Component

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https://leanpub.com/cbra

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Teasing out App Component

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Teasing out App Component 0. Got tests?

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Teasing out App Component 1. Find a vertical that makes sense on its own V C M

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Teasing out App Component 2. Namespace controllers, views, and models V C M

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Teasing out App Component 2. Namespace controllers, views, and models V C M

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Teasing out App Component 3. Hunt down other dependencies V C M

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Teasing out App Component 4. Move all namespaced code into an engine V C M

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Teasing out App Component 4b. rails plugin new MY_NEW_COMPONENT --full --mountable V C M

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Teasing out App Component Step 3. PROFIT! V C M

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Teasing out App Component PROTIP: Special Case V C M M

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Extracting Functional Component

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Extracting Functional Component 0. Got tests?

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Extracting Functional Component 1. Find functional component

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Extracting Functional Component 2. bundle gem MY_NEW_COMPONENT

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Extracting Functional Component 3. move all files into gem (and namespace)

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Extracting Functional Component 4. move the other stuff the gem needs

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Extracting Functional Component 5. Require the gem from your app

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Extracting Functional Component 6. Add shims/ports/adapters to make the app happy

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Extracting Functional Component Step 3. PROFIT!

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I will help @shageman

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Thanks! @shageman