subdomain-fu, subdomain

Railscast Subdomains-Fu
SubdomainFu: A New Way To Tame The Subdomain
Don't Forget To Reserve Subdomains For Yourself

# in environment.rb<br /> <br /># These are the sizes of the domain (i.e. 0 for localhost, 1 for something.com)<br /># for each of your environments<br />SubdomainFu.tld_sizes = { :development => 0,<br /> :test => 0,<br /> :production => 1 }<br /><br /># These are the subdomains that will be equivalent to no subdomain<br />SubdomainFu.mirrors = ["www"]<br /><br /># This is the "preferred mirror" if you would rather show this subdomain<br /># in the URL than no subdomain at all.<br />SubdomainFu.preferred_mirror = "www"<br />
<br /># http://some_subdomain.myapp.com/<br />current_subdomain # => "some_subdomain"<br /><br /># http://www.myapp.com/ or http://myapp.com/<br />current_subdomain # => nil<br /><br /># http://some.subdomain.myapp.com<br />current_subdomain # => "some.subdomain"<br />
<br />url_for(:controller => "my_controller", <br /> :action => "my_action", <br /> :subdomain => "awesome") # => http://awesome.intridea.com/my_controller/my_action<br /> <br />users_url(:subdomain => false) # => http://intridea.com/users<br /><br /># The full URL will be generated if the subdomain is not the same as the<br /># current subdomain, regardless of whether _path or _url is used.<br />users_path(:subdomain => "fun") # => http://fun.intridea.com/users<br />users_path(:subdomain => false) # => /users<br />

Implementing A Simple Account Key System
<br />class ApplicationController < ActionController::Base<br /> protected<br /> <br /> # Will either fetch the current account or return nil if none is found<br /> def current_account<br /> @account ||= Account.find_by_subdomain(current_subdomain)<br /> end<br /> # Make this method visible to views as well<br /> helper_method :current_account<br /> <br /> # This is a before_filter we'll use in other controllers<br /> def account_required<br /> unless current_account<br /> flash[:error] = "Could not find the account '#{current_subdomain}'"<br /> redirect_to :controller => "site", :action => "home", :subdomain => false<br /> end<br /> end<br />end<br />

在model 用url_for

Calling url_for from a Model in Rails
url_for’ method – according to its Rails source code documentation – is only available to controllers, views and mailers by default. (It’s actually a method found in the ActionController module so it’s no surprise that ActiveRecord classes don’t have access to this method.)

<br /> class Article < ActiveRecord::Base<br /> include ActionController::UrlWriter<br /> end<br />

資料流重導向
Rake in Background
<br /># controllers/application.rb<br />def call_rake(task, options = {})<br /> options[:rails_env] ||= Rails.env<br /> args = options.map { |n, v| "#{n.to_s.upcase}='#{v}'" }<br /> system "/usr/bin/rake #{task} #{args.join(' ')} --trace 2>&1 >> #{Rails.root}/log/rake.log &"<br />end<br /><br /># mailings_controller.rb<br />def deliver<br /> call_rake :send_mailing, :mailing_id => params[:id].to_i<br /> flash[:notice] = "Delivering mailing"<br /> redirect_to mailings_url<br />end<br /><br /># lib/tasks/mailer.rake<br />desc "Send mailing"<br />task :send_mailing => :environment do<br /> mailing = Mailing.find(ENV["MAILING_ID"])<br /> mailing.deliver<br />end<br /><br /># models/mailing.rb<br />def deliver<br /> sleep 10 # placeholder for sending email<br /> update_attribute(:delivered_at, Time.now)<br />end<br /><br />

daemon

Custom Daemon
Cron Jobs in Ruby on Rails

<br />sudo gem install daemons<br />script/plugin install git://github.com/dougal/daemon_generator.git<br />script/generate daemon mailer<br />RAILS_ENV=development lib/daemons/mailer_ctl start<br />

rotate backup log

Rotating Rails Log Files
鳥哥 logrotate

Rails Rake

Ruby on Rails Rake Tutorial (aka. How rake turned me into an alcoholic)
How do I write Rake tasks for my Rails application?
<br />#可以透過RAILS_ROOT 拿到application 的path<br />namespace :utils do<br /> desc "Create blank directories if they don’t already exist"<br /> task(:create_directories) do<br /><br /> 1. The folders I need to create<br /> shared_folders = ["icons","images","groups"]<br /><br /> for folder in shared_folders<br /><br /> 1. Check to see if it exists<br /> if File.exists?("#{RAILS_ROOT}/public/#{folder}")<br /> puts "#{RAILS_ROOT}/public/#{folder} exists"<br /> else<br /> puts "#{RAILS_ROOT}/public/#{folder} doesn’t exist so we’re creating"<br /> Dir.mkdir "#{RAILS_ROOT}/public/#{folder}"<br /> end<br /><br /> end<br /> end<br />end

Can I access my Rails Models inside a Task?
<br />#重點就是在 :enviroment<br /><br />#To run this task on my development db I would run “rake utils:send_expire_soon_emails”. If I wanted to run this on my production database, I would run “rake RAILS_ENV=production utils:send_expire_soon_emails”.<br /><br />#0 0 * * * cd /var/www/apps/rails_app/ && /usr/local/bin/rake RAILS_ENV=production utils:send_expire_soon_emails<br /><br />namespace :utils do<br /> desc "Finds soon to expire subscriptions and emails users"<br /> task(:send_expire_soon_emails => :environment) do<br /><br /> Find users to email<br /> for user in User.members_soon_to_expire<br /> puts “Emailing #{user.name}”<br /> UserNotifier.deliver_expire_soon_notification(user)<br /> end<br /> end<br />end <br /><br /><br />#rake a excute task b, task c first<br />rask(:a => [:b, :c] ) do<br /> # do some thing<br />end<br /><br /><br />#===========================<br />#rake dev:build<br /><br />namespace :dev do<br /> desc "Rebuild system"<br /> task :build => ["tmp:clear","db:drop", "db:create", "db:migrate", :setup, :fake]<br /><br /> desc "Setup system data"<br /> task :setup => :environment do<br /> puts "Attempts to create system user"<br /> u = User.new( :login => "root", :password => ‘password’ )<br /> u.save!<br /> end<br /><br /> desc "Create fake data"<br /> task :fake => :environment do<br /> Event.create!( :title => 'osdc 2008' )<br /> Event.create!( :title => 'osdc 2009' )<br /> Event.create!( :title => 'osdc 2010' )<br /> ...<br /> ...<br /> end<br />end<br /><br />

unique, auto_increment

execute "ALTER TABLE tou_service ADD UNIQUE (service_index)"
execute "ALTER TABLE tou_service CHANGE service_index service_index int(11) DEFAULT NULL AUTO_INCREMENT"