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Rails engines

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    Rails engines Rails engines Presentation Transcript

    • Rails Engines - what, why, how Grzegorz Witek
    • Agenda
        • What engines are
        • How they appeared in Rails core
        • How to use them
        • What are their pros and cons
        • Summary
    • What engines are Application Engine Plugins
    • What are their capabilities?
      • Rails engines have:
      Rack middleware stack
    • What are their capabilities?
      • Rails engines have:
      environment.rb
    • What are their capabilities?
      • Rails engines have:
      Routes
    • What are their capabilities?
      • Rails engines have:
      Plugin support
    • Long way to the CORE
        • Plugin
        • Rails 2.3 - partial support
        • 2010 Ruby Summer of Code
        • Rails 3.1 - full engines in core
        • ...
        • 2011? - a few apps in the same process
    • A bit of code
      • Rails . application . routes . draw do mount Cms :: Engine => "/portal", :as => 'cms' end
      main_application.root_pathcms.articles_path rake railties:copy_migrations authenticate :admin do mount Tolk :: Engine => "/tolk" end
    • Are they really worth using?
      • Pros:
        • they are almost as powerful as rails app
        • they are isolated (you don't need to change your code to use them!)
        • You can share code between applications
        • they can save your time!
      • Cons:
        • they're not suitable for every application 
    • Do they exist?
        • Devise
        • Rails Admin 
        • Rails Assets (to be released in 3.1)
        • Tolk
    • Any questions? Thanks for your attention!
    • Sources:
        • http://piotrsarnacki.com
        • https://github.com/dhh/tolk
        • http://rails-engines.org/  
        • http://railscasts.com/episodes/149-rails-engines
        • http://github.com/sferik/rails_admin
        • https://github.com/lazyatom/engines
        • https://github.com/rails/rails