Quickly see it working and be amazed:

 sudo gem install wee cd /usr/lib/ruby/gems/1.8/gems/wee-2.0.0/examples/ ruby demo.rb #Now goto http://localhost:2000/ 

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 module Rack module Utils class HeaderHash puts "Rack::Utils::HeaderHash bug fix on #replace" def replace other self.clear other.each { |k,v| self[k] = v } end end end end 

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  class Whatever delegate :first_name, :last_name, :to => :@user def initialize(user) @user = user end end 

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 MYAPP_CONFIG=YAML::load( ERB.new( IO.read( "#{RAILS_ROOT}/config/myapp.yml" ) ).result )[RAILS_ENV].symbolize_keys 

In "config/myapp.ytml"

 development: mode: development test: mode: test production: mode: production 

You can access MYAPP_CONFIG throughout the application:

 MYAPP_CONFIG[:mode] #=> 'development' 

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Hint: CTRL+SHIFT+V pastes in Ubuntu terminal. You can paste the code from web pages.

Install Tokyo Cabinet and Tokyo Tyrant from Github:

 cd /usr/local/src git clone git://github.com/clement/tokyo-cabinet.git git clone git://github.com/etrepum/tokyo-tyrant.git cd tokyo-cabinet/ ./configure make sudo make install cd .. cd tokyo-tyrant/ ./configure make sudo make install 

Those instructions are similar to that of Openwferu but, at least today, clement is more up-to-date then etrepum.

Then install the Ruby interface

 sudo gem install rufus-tokyo 

Fire your irb and play with the examples

For example,

  require 'rubygems' require 'rufus/tokyo' db = Rufus::Tokyo::Cabinet.new('data.tch') db['nada'] = 'surf' p db['nada'] # => 'surf' p db['lost'] # => nil db.close 

Check also On the Way to Faster, Bigger Rails Applications

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• Tokyo Cabinet stores 1 million records in 0.7 seconds. Used by Japanese Facebook You need to use faster storage. Ordinary DB might not be sufficient.
  • Rufus Tokyo Ruby Interface
  • Installing all from GitHub
• Shooting Star, A Ruby implemetation of Comet, which is used by Google Talk. Polling is expensive. You need to handle real time events from the server for your AJAX applications.
  • Juggernaut is actually easier to use.
• Starling, the job queue manager. Your API has to return as soon as possible. Queue the requests. Used in Twitter
• cache_fu, acts_as_cached
  • Presentation of Chris Wanstrath, github
  • Testing Caching
• RubyCAS Server
  • Central authentication in one place for many applications
  • You can manage it with Clearance - The Rails Authentication For Developers Who Write Tests (source at github)

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Unit testing with FactoryGirl is very DRY. The power of Ruby enables you to do more cool and elaborate things with factories. Factories can be equipped with useful custom methods. Let's define a child factory that always uses the same default parent:

 Factory.define :child do |f| f.sequence(:name) {|n| "Child#{n}"} def f.default_parent @default_parent ||= Factory(:parent) end f.parent_id { f.default_parent.id } end 

Now every child created will have the same default parent. Instead of abusing the global space, instead of having to modify class Factory, the method and variable its using is neatly included in the factory instance.

And whenever you want, you can use another parent in the tests.

 child = Factory(:child, :parent_id=another_parent.id) 

But the default child will come with the single default parent. More speed and space

 child1 = Factory(:child) child2 = Factory(:child) # child1.parent == child2.parent 

You can access the custom method elsewhere

 f = Factory.factory_by_name(:child) f.default_parent 

As you see, you can treat the factories like classes - with custom methods and properties. This allows possibilities which are not evident from the syntax of Thoughtbot Factory Girl

Remember. In Ruby, object instances can have their custom methods!

To be able to do whatever you can do in a normal class declaration, here is an alternative syntax:

 Factory.define :child do |f| class << f #do whatever you can do in a normal class definition def default_parent @default_parent ||= Factory(:parent) end end f.sequence(:name) {|n| "Child#{n}"} f.parent_id { f.default_parent.id } end 

Thoughtbot Factory Girl will allow you write your tests easier than using fixtures.

Happy unit testing… Don't forget to use Shoulda!

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Matt Lins has a beautiful example there:

 class AdminLoginTest < ActionController::IntegrationTest context 'An employee' do setup do @employee = Factory(:employee) end should 'be able to login with a valid username and password' do visit '/admin' assert https? assert_equal '/admin/sessions/new', path fills_in 'Email', :with => @employee.user.email fills_in 'Password', :with => @employee.user.password clicks_button 'Log In' assert_equal @employee.user.id, session[:user_id] end should 'be denied access with an invalid username or password' do visit '/admin' assert https? assert_equal '/admin/sessions/new', path fills_in 'Email', :with => @employee.user.email fills_in 'Password', :with => 'wrongpassord' clicks_button 'Log In' assert_nil session[:user_id] end end end 

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 a = gets.to_i b = gets.to_i c = a + b puts c 

And this is the corresponding Java code

 import java.io.*; public class Addup { static public void main(String args[]) { InputStreamReader stdin = new InputStreamReader(System.in); BufferedReader console = new BufferedReader(stdin); int i1 = 0,i2 = 0; String s1,s2; try { s1 = console.readLine(); i1 = Integer.parseInt(s1); s2 = console.readLine(); i2 = Integer.parseInt(s2); } catch(IOException ioex) { System.out.println("Input error"); System.exit(1); } catch(NumberFormatException nfex) { System.out.println("\"" + nfex.getMessage() + "\" is not numeric"); System.exit(1); } System.out.println(i1 + " + " + i2 + " = " + (i1+i2)); System.exit(0); } } %> javac Addup.java %> java Addup 

No more comments.

(Code blocks borrowed from http://www.ariel.com.au/a/teaching-programming.html)

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 rails | grep database 

If you want to use Postgresql, for example, create a dummy project with it:

 rails dummy -d postgresql 

Then copy and edit dummy/config/database.yml on to your_project/config/database.yml and create the tables

 cd your_project rake db:create:all rake db:migrate 

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Your virtual machine on VirtualBox can be a server. Let's say you have a virtual machine named "My Server". Execute the script below on your host (not the virtual machine):

 VBoxManage setextradata "My Server" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/guestssh/Protocol" TCP VBoxManage setextradata "My Server" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/guestssh/GuestPort" 22 VBoxManage setextradata "My Server" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/guestssh/HostPort" 2222 VBoxManage setextradata "My Server" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/guestssh/Protocol" TCP VBoxManage setextradata "My Server" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/guestssh/GuestPort" 3000 VBoxManage setextradata "My Server" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/guestssh/HostPort" 3000 

Now you are able to ssh into the virtual machine:

 ssh localhost -p 2222 

And you can browse the web service on port 3000

 firefox http://localhost:3000 

Err, what is port 3000? The default port for rails of course. I am testing the Ruby on Rails deployment on a virtual machine.

You've got the idea. Map your ports as you wish.

You will always have a fresh machine for setup tests with VirtualBox VirtualBox. Experience has shown me that you cannot debug deployment on an already installed development machine.

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 sudo cp -a /var/lib/gems/* /usr/lib/ruby/gems/ sudo rm -R /var/lib/gems/* sudo ln -nfs /usr/lib/ruby/gems/1.8 /var/lib/gems/ 

I have seen this problem appearing on Ubuntu when both apt-get and downloaded tar used to install rubygems. So the machine end up with 2 conflicting rubygems installations.

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Programming really made me smoke more. Debugging was smoking. Conceiving new ideas was smoking. Creativity was smoking. And getting double caffeine… One more coffee…

In 80's, we were defined as the beasts taking our double caffeine to keep programming until the morning. I clearly remember the Jolt logo and the words "Double Caffeine" on the cover of Dr Dobb's Magazine in 80's. But never mind. I like Jolt Awards.

Anyway double caffeine was our life…

After programming for decades, I decided to become more healthy to keep programming many more decades. Alas because computers remind me smoking, I am delaying my articles a bit. Using Nicotinell chewing gums, I am having an experience similar to the experience of Christina. If it all goes well then I might even proceed to the top 5 ways to double your energy without caffeine. We'll see…

Cheers;
Umuro

PS. Somebody tells me: "To keep up your spirit, let me remind you to some of the benefits a smokeless life will bring: health improvement, saving lots of money, easy excess cute smoke-free girls, no worries about that 'last one' in the package, the happiness to your parents, no fights with the future wife being pregnant (and annoyed about nearly everything, especially you smoking), 50% less chance on cancer, less littering, less paint jobs, smelling better, or smelling better (which might not be such a benefit to you).."

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We want reusable components in our applications. With engines, whole model, view and persistence, a whole slice of application is available for reuse. Engines used to be a Rails plugin. Now it's embedded in Rails 2.3

• Railscasts: Rails Engines
• Slideshow: Power of Rails Engines and Templates
• Engines in Rails 2.3 by Mike Perham
• ASCIICasts Rails Engines
• Getting Started with Engines Development in Rails

To make sure you are not behind take a look at Ryan's Scraps on New Rails 2.3 Features

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By Ben Myles

Anyone that reads blogs from the Rails community has probably already heard about God. No, not the deity in the sky, but an excellent monitoring application that watches your processes and keeps them running. I've mostly seen it used for taming mongrel but it can be used to monitor any process.

We're running God for all our managed hosting clients to make sure their mongrels don't pass out from exhaustion. It's held up great so far. See the resources at the end of this article for our init script and a sample global config.

The God configuration file should be self explanatory. It's just Ruby code, nothing magic going on there. I've just wrapped the core God.watch code around some loops to enable support for monitoring an unlimited number of applications. One small note about the init.d script: it first launches God, and then loads the config file via the 'god load' command. I'm aware that you can send god the -c parameter when launching it, but I've found that sometimes (seemingly randomly) that won't load the config.

The init.d script should work fine on any RHEL/CentOS system. Once you add the file to /etc/init.d/god just do:

 chmod +x /etc/init.d/god chkconfig --add god chkconfig --level 345 god on /etc/init.d/god start 

Now you're good to go. Let those misbehaving K-9 devils do their best - they're no match for God.

Here are a couple resources relevant to this article:

• God
• Integral Impressions managed hosting service
• /etc/init.d/god
• /etc/god.conf

Ben Myles is a web developer for Integral Impressions, an interactive marketing firm that specializes in Internet marketing products and services.

Article Source: Ben Myles, EzineArticles

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Maybe you have been hearing that Ruby is inspired by Smalltalk. Huw Collingbourn gives you a chance to feel it by comparing the two languages. You can discover a lot more about the power of Ruby learning the powers of Smalltalk. Here is the full story... Uh, if you are still saying what is Ruby on Rails then you can enjoy a quick but productive first experience of Ruby on Rails here. And you can immediately start to play with Smalltalk using Squeak or Dolphin Smalltalk

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Here is the updated tutorial!

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