Rails::Engine
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This document discusses Rails engines. It explains that an engine works like a Rails application and includes components like Active Record and Action Controller. Engines can be packaged as gems and included in other Rails applications. The document provides instructions for creating a sample blog engine and integrating it with another Rails application by symlinking migrations, routes and public assets.
Rails::Engine
- 1. Rails::Engine @flaviamissi flaviamissi.com.br
- 2. What is a engine? << slices engine
- 3. What is a engine? ● Works exactly as a built-in rails application ● Railtie ● Active Record ● Active Resource ● Action Mailer ● Action Controller ● Action View
- 4. Application -> Engine -> Railtie module Rails class Application < Engine ... class Engine < Railtie ... ... https://github.com/rails/rails/blob/master/railties/lib/rails/application.rb https://github.com/rails/rails/blob/master/railties/lib/rails/engine.rb
- 6. Creating Our Engine App $ rails new MyApp
- 7. What you don't need $ rm -rf log/ $ rm -rf tmp/ $ rm -rf doc/ $ rm -rf vendor/ $ rm -rf config/enviroments/ $ rm -rf config/initializers/ * $ rm -rf config/boot.rb * $ rm -rf script/ * * = later!
- 8. And We Have Now...
- 9. A Simple Blog App $ rails g scaffold Blog::Post title:string post:text namespace!
- 11. config/application.rb module MyApp class Application < Rails::Application module MyApp class Engine < Rails::Engine
- 12. Integrating With Another App $ cp -R ~/my_engine ~/my_app/vendor/plugins/
- 13. Integrating With Another App $ rake routes blog_posts GET /blog/posts(.:format) {:action=>"index", :controller=>"blog/posts"} POST /blog/posts(.:format) {:action=>"create", :controller=>"blog/posts"} new_blog_post GET /blog/posts/new(.:format) {:action=>"new", :controller=>"blog/posts"} edit_blog_post GET /blog/posts/:id/edit(.:format) {:action=>"edit", :controller=>"blog/posts"} blog_post GET /blog/posts/:id(.:format) {:action=>"show", :controller=>"blog/posts"} PUT /blog/posts/:id(.:format) {:action=>"update", :controller=>"blog/posts"} DELETE /blog/posts/:id(.:format) {:action=>"destroy", :controller=>"blog/posts"}
- 15. A Problem... Migrations and everything inside public/ are not available to the main application
- 16. The Solution namespace :engine do task :create, :engine do |cmd, args| puts "Creating symbolic links..." system "mkdir #{Rails.root.to_s}/public/#{args[:engin system "ln -s #{Rails.root.to_s}/vendor/plugins/#{arg system "ln -s #{Rails.root.to_s}/vendor/plugins/#{arg puts "Done!" end end
- 17. Some Interesting Links ● https://github.com/search?q=rack&type=Everything&repo=&langOverride=&start_ ● http://akitaonrails.com/2010/05/10/rails-3-introducao-a-engines ● http://api.rubyonrails.org/classes/Rails/Engine.html ● http://api.rubyonrails.org/classes/Rails/Railtie.html