Rails 2.3
Brian Turnbullhttp://brianturnbull.com
Templates
rails app
templaterails app’
rails app -m template.rb
rails app -m http://example.com/template
rake rails:template LOCATION=template.rb
Templates# template.rbgem "hpricot"rake "gems:install"run "rm public/index.html"generate :scaffold, "person name:string"route "map.root :controller => 'people'"rake "db:migrate"
git :initgit :add => "."git :commit => "-a -m 'Initial commit'"
Pratik Naik — http://m.onkey.org/2008/12/4/rails-templates
Templates
Jeremy McAnally’s Template Library
http://github.com/jeremymcanally/rails-templates/tree/master
Engines
Rails Plugins turned to Eleven
Share Models, Views, and Controllers with Host App
Share Routes with Host App
http://rails-engines.org/news/2009/02/02/engines-in-rails-2-3/
Engines
Not Yet Fully Baked
Manually Manage Migrations
Manually Merge Public Assets
http://rails-engines.org/news/2009/02/02/engines-in-rails-2-3/
Nested TransactionsUser.transaction do User.create(:username => 'Admin') User.transaction(:requires_new => true) do User.create(:username => 'Regular') raise ActiveRecord::Rollback endend
User.find(:all) # => Returns only Admin
http://guides.rubyonrails.org/2_3_release_notes.html
Nested Attributes
class Book < ActiveRecord::Base has_one :author has_many :pages
accepts_nested_attributes_for :author, :pagesend
http://guides.rubyonrails.org/2_3_release_notes.html
Nested Formsclass Book < ActiveRecord::Base has_many :authors accepts_nested_attributes_for :authorsend
<% form_for @book do |book_form| %> <div> <%= book_form.label :title, 'Book Title:' %> <%= book_form.text_field :title %> </div> <% book_form.fields_for :authors do |author_form| %> <div> <%= author_form.label :name, 'Author Name:' %> <%= author_form.text_field :name %> </div> <% end %> <% end %> <%= book_form.submit %><% end %>
http://guides.rubyonrails.org/2_3_release_notes.html
Dynamic and Default Scopes## id Integer## customer_id Integer## status String## entered_at DateTimeclass Order < ActiveRecord::Base belongs_to :customer default_scope :order => 'entered_at'end
Order.scoped_by_customer_id(12)Order.scoped_by_customer_id(12).find(:all, :conditions => "status = 'open'")Order.scoped_by_customer_id(12).scoped_by_status("open")
http://guides.rubyonrails.org/2_3_release_notes.html
Other Changes
Multiple Conditions for CallbacksHTTP Digest AuthenticationLazy Loaded SessionsLocalized Viewsand More!
http://guides.rubyonrails.org/2_3_release_notes.html
Rails 2.3
Rails Metal
SPEED
Simplicity
Metal Endpoint
## app/metal/hello_metal.rbclass HelloMetal def self.call(env) if env["PATH_INFO"] =~ /^\/hello\/metal/ [200, {"Content-Type" => "text/plain"}, ["Hello, Metal!"]] else [404, {"Content-Type" => "text/html"}, ["Not Found"]] end endend
http://soylentfoo.jnewland.com/articles/2008/12/16/rails-metal-a-micro-framework-with-the-power-of-rails-m
Equivalent Controller
## app/controllers/hello_rails_controller.rbclass HelloRailsController < ApplicationController def show headers['Content-Type'] = 'text/plain' render :text => 'Hello, Rails!' endend
http://soylentfoo.jnewland.com/articles/2008/12/16/rails-metal-a-micro-framework-with-the-power-of-rails-m
Sinatra!
require 'sinatra'Sinatra::Application.set(:run => false)Sinatra::Application.set(:environment => :production)
HelloSinatra = Sinatra::Application.new unless defined? HelloSinatra
get '/hello/sinatra' do response['Content-Type'] = 'text/plain' 'Hello, Sinatra!'end
http://soylentfoo.jnewland.com/articles/2008/12/16/rails-metal-a-micro-framework-with-the-power-of-rails-m
Rack
Object.call(env)
[status, headers, response]
Metal Endpoint
## app/metal/hello_metal.rbclass HelloMetal def self.call(env) if env["PATH_INFO"] =~ /^\/hello\/metal/ [200, {"Content-Type" => "text/plain"}, ["Hello, Metal!"]] else [404, {"Content-Type" => "text/html"}, ["Not Found"]] end endend
call(env)
Web Server
Middleware
Middleware
Rails Dispatcher
call(env)
call(env) [s,h,r]
[s,h,r]
[s,h,r]
Rack Middleware in Rails
Rack Middleware in Rails% rake middlewareuse Rack::Lockuse ActionController::Failsafeuse ActionController::Session::CookieStoreuse Rails::Rack::Metaluse ActionController::RewindableInputuse ActionController::ParamsParseruse Rack::MethodOverrideuse Rack::Headuse ActiveRecord::QueryCacherun ActionController::Dispatcher.new
% rake middlewareuse Rack::Lockuse ActionController::Failsafeuse ActionController::Session::CookieStoreuse Rails::Rack::Metaluse ActionController::RewindableInputuse ActionController::ParamsParseruse Rack::MethodOverrideuse Rack::Headuse ActiveRecord::QueryCacherun ActionController::Dispatcher.new
Rack Middleware in Rails
Django > Rails?## lib/middleware/django_middleware.rbclass DjangoMiddleware def initialize(app) @app = app end
def call(env) status, headers, response = @app.call(env) new_response = [] response.each do |part| new_response << part.gsub(/Rails/, 'Django') end [status, headers, new_response] endend
## config/environment.rbconfig.middleware.use DjangoMiddleware
http://github.com/bturnbull/bturnbull-metal-demo