daemon_generator vs Starling and Workling

Custom Daemon
Starling and Workling

Custom Daemon 比較適合就是讓daemon 去檢查 之後做事情

Starling 比較適合 就是真的把動作丟到background 去做, 有working 在, 有message queue 也可以配memcache

Positive and Negative Lookahead, regexp

Lookahead and Lookbehind Zero-Width Assertions
The negative lookahead construct is the pair of round brackets, opening bracket followed by a question mark and an exclamation point
<br />#a "q" not followed by a "u".<br /># 後面不是跟著u 的 q, 是要找q<br />q(?!u)<br /><br />
把 1234567 這樣的數字在印出加上逗號變成 1,234,567 這樣的格式
<br />num.to_s.gsub(/(\d)(?=\d{3}+(\.\d*)?$)/, '\1,')<br /><br />數字後面跟的數字(?=) 數目要是 3的倍數(\d{3}) 直到結尾 ($)<br />

hacking_activerecord, include module , extend, class_eval

Hacking ActiveRecord
module,class_eval,extend
<br /># test_helper.rb<br />class Test::Unit::TestCase<br /> self.use_transactional_fixtures = true<br /> self.use_instantiated_fixtures = false<br /> <br /> def disable_validation<br /> ActiveRecord::Base.disable_validation!<br /> yield<br /> ActiveRecord::Base.enable_validation!<br /> end<br />end<br /><br />module ValidationDisabler<br /> def self.included(base)<br /> base.class_eval do<br /> extend ClassMethods<br /> alias_method_chain :valid?, :disable_check<br /> end<br /> end<br /> <br /> def valid_with_disable_check?<br /> if self.class.validation_disabled?<br /> true<br /> else<br /> valid_without_disable_check?<br /> end<br /> end<br /> <br /> module ClassMethods<br /> def disable_validation!<br /> @@disable_validation = true<br /> end<br /> <br /> def enable_validation!<br /> @@disable_validation = false<br /> end<br /> <br /> def validation_disabled?<br /> @@disable_validation ||= false<br /> end<br /> end<br />end<br /><br />class ActiveRecord::Base<br /> include ValidationDisabler<br />end<br />

memo, include rails environment and some File Dir method

<br />require File.dirname(__FILE__) + "/../../config/environment"<br /><br />ActiveRecord::Base.logger.info <br /><br />Dir[File.dirname(__FILE__) + "/config/environments/*"]<br />["./config/environments/test.rb", "./config/environments/development.rb", "./config/environments/production.rb"]<br /><br />>> File.expand_path(File.dirname(__FILE__) + "/../config/environment")<br />=> "/home/lake/config/environment"<br />
<br />session[:last_product_page] = request.env['HTTP_REFERER']<br />

Putting it in ~/web/lib is correct, but did you also require it from an initializer?

1. Create an initializer in ~/web/config/initializers called patches.rb
2. In the file put require File.join(Rails.root, 'lib', 'active_record_ndbcluster.rb')
3. Restart your webserver/Rails console

It should then work

rails , lib, module

<br />#lib/create_auth.rb<br />module CreateAuth<br /> def create_auth(target='')<br /> #...<br /> end<br />end<br /><br />#app/controllers/membercenter_controller.rb<br /> #to include create_auth<br /> include CreateAuth<br /><br /> if cellphone_code == create_auth(ucs.cellphone)<br /> #...<br />
<br />require "tempfile"<br /><br />module ExternalMailWriter<br /> def write_external_mail(dir, from_email, from_url, to, subject, content)<br /> t = Tempfile.new("email", dir)<br /> n = t.path<br /> t.close(true)<br /> <br /> t = File.new(n, "w")<br /> t.puts "From: \"GoYou\" <no-reply@iwakela.com>"<br /> t.puts "To: #{to}"<br /> t.puts "Subject: #{subject}"<br /> t.puts<br /> t.puts _("Message sent from %s") % from_url<br /> t.puts<br /> t.puts content<br /> t.puts<br /> t.close<br /> end<br /><br /><br />#app/controllers/message_controller.rb<br />require_dependency "external_mail_writer"<br />include ExternalMailWriter<br /><br />write_external_mail(EXTERNAL_MAIL_PATH, EXTERNAL_MAIL_SENDER, @msg.from_user.shortname + " " + url_for(:controller => "user", :action => "show", :id => @me.id, :only_path => false) , email, @msg.subject, @msg.body)<br />

block in view, yield, capture

Blocks in View
Pretty Blocks in Rails Views
def admin_area(&block)<br /> if admin?<br /> concat content_tag(:div, capture(&block), :class => 'admin'), block.binding<br /> end<br />end<br /><br />def link_to(*args,&block)<br /> if block_given?<br /> concat(super(capture(&block), *args), block.binding)<br /> else<br /> super(*args)<br /> end<br />end<br /><br />show.html.erb<br /><% render(:layout => 'rounded') do %><br /> Rounded corners are so Web 2.0.<br /><% end %><br /><br />_rounded.html.erb:<br /><div class="rounded_box"><br /> <div class="rounded_corner_top"> </div><br /> <div class="rounded_corner_content"><%= yield %></div><br /> <div class="rounded_corner_bottom"> </div><br /></div><br /><br />_content.html.erb<br />Rounded corners are so Web 2.0.<br /><br />show.html.erb<br /><%= render :partial => "content", :layout => "rounded" %><br /><br /><% render(:layout => 'rounded', :locals => {:title => "What I think about rounded corners", :id => "rounded_thoughts", :background => true}) do %><br /> Rounded corners are so Web 2.0.<br /><% end %><br /><br /><div class="rounded_box"><br /> <[div class="rounded_corner_top" id="<%= id %>"]> <[/div]><br /> <% if title %><br /> <div class="rounded_title"><%= title %></div><br /> <% end %><br /> <[div class="<%= background ? "rounded_corner_content" : "rounded_corner_no_bg" %>"]><%= yield %><[/div]><br /> <div class="rounded_corner_bottom"> </div><br /></div><br />

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 />