rubyonrails

Ruby On Rails
BeijingLUG

by Nathaniel Brown
April 2007

Overview
●
Install Ruby
●
Install Rails
●
(Optional) Install Eclipse
●
Talk about Ruby
●
Talk about Rails
●
Example Application
●
Links to Resources

Install Ruby
●
sudo apt-get install ruby irb ri rdoc
●
If you want to install mongrel you will also have
to install the dev packages.
●
sudo apt-get install ruby1.8-dev build-essential

Install Ruby Gems
●
wget : http://rubyforge.org/frs/download.php/17190/
●
tar xzvf rubygems-0.9.2.tgz
●
cd rubygems-0.9.2
●
sudo ruby setup.rb
●
cd ..
●
rm -rf rubygems-0.9.2

Install Rails and Mongrel
●
sudo gem install rails --include-dependencies
●
(Optional) sudo gem install mongrel --include-
dependencies
●
(Optional) Select the latest version of each
library.

Install MySQL Server
●
You could use PostgreSQL or SQLite instead
but most examples use MySQL so we will as
well.
●
sudo apt-get install mysql-server phpmyadmin
libmysql-ruby apache2 libapache2-mod-php5

(Optional) Install Eclipse
●
sudo apt-get install eclipse sun-java5-jdk sun-
java5-fonts

(Optional) Install RDT, RadRails and
Aptana and Subclipse
●
Open Eclipse and go to Help ->Software Updates
-> Find and Install...
●
Select “Search for new features to install” then
click on “Next”.
●
Add the following remote sites:
RDT : http://updatesite.rubypeople.org/release
RadRails : http://radrails.sourceforge.net/update
Aptana : http://update.aptana.com/install/
Subclipse : http://subclipse.tigris.org/update_1.2.x
●
Once they have been added install all of them.

(Optional) Config RDT and RadRails
●
Open Eclipse and go to Windows ->
Preferences
●
Find Ruby and add the Ruby interpreter.
●
Find Rails and add the applications. They
should all be in /usr/bin/*app name*

Ruby is a nice language
●
Object Orientated
●
Automatic garbage collection
●
Sane readable code that makes sense.

Ruby example code 1
●
Is readable

puts "leon".reverse.capitalize

staff_list = ["joe", "steve", "bob"]
staff_list.sort!
staff_list.each do |first_name|
puts first_name.capitalize
end

3.times do |zork| puts "#{zork} " end

Ruby example code 2
−Tells you if it will change the variable.
my_string = "12345"
new_string = my_string.chop
puts "String chopped."
puts "my_string: #{my_string}"
puts "new_string: #{new_string}"

my_string = "98765"
my_string.chop!
puts "String chopped."

my_number = 999474
puts my_number.to_s.include?("94")

my_string = "This is a test."
puts "#{my_string[3..5]}"
puts "#{my_string[2]}"
my_string[10..13] = "Ruby"
puts my_string

Ruby example code 3

−Lots of things are just done really nicely.
#create our thread array
threads = []

5.times do |i|
  #create 5 threads into the array
  threads[i] = Thread.new do
    #wait a random amount of time, then print a message
    sleep(rand(10))
    puts "I am thread number #{i}"
  end
end

#let each thread finish before ending the program
threads.each {|t| t.join}

Rails is a nice Framework
●
Rapid Application Development
●
Caching
●
Model View Controller
●
Nice informative errors

●
DRY – Don't Repeat Yourself.
●
Convention over Configuration

Rails supports modern features
●
AJAX is build into the framework but JavaScript
isn't required.
●
Pretty URLs
●
Active Record which is a type of Object
Relation Mapping (ORM)

Rails encourages good
development practices
●
Validation
●
Unit testing
●
Use of development, testing and production
environments with sane settings for each of
them. e.g. Development has caching turned off.
Production and Testing have it turned on.
●
Version control is encouraged and assumed.

The Bad
●
No manual only books.
●
Ruby is relatively slow. (See Language Shoot-
out)
●
Rails is database driven which means it scales
with the database.
●
You'll often have to do things the “Rails Way”.
(But it's often the right way as well)
●
Lots of the 3rd party libraries are still unstable.
(Improving quickly)

Create Your First Rails Applications
●
If you are reading this online then go to the links
section find RadRail's home page. He has a
fairly good tutorial using RadRails.

Resources Links
●
Rails for Fedora -
http://digitalmediaminute.com/howto/fc4rails/
●
RDT - http://rubyeclipse.sourceforge.net/
●
RadRails and Aptana - http://www.radrails.org/
●
Language Shoot-out -
http://shootout.alioth.debian.org/

Cheat Sheets Links
●
Rails, CSS, Javascript, HTML, etc (A4) -
http://www.ilovejackdaniels.com/
●
Nice Rails summary -
http://www.blainekendall.com/index.php/rubyonrails
●
A couple of Rails Cheat Sheets -
http://www.slash7.com/goodies

Rails Links
●
Ruby - http://www.ruby-lang.org/en/
●
Ruby on Rails - http://www.rubyonrails.org/
●
Ruby Forge - http://rubyforge.org/
●
Free Ruby manual - http://www.poignantguide.net/ruby/
●
Rails and Caching -
http://www.railsenvy.com/2007/2/28/rails-caching-tutorial
●
Ruby On Rails to exe -
http://www.erikveen.dds.nl/distributingrubyapplications/rails.html
●
Rails Tricks -
http://www.rubyinside.com/19-rails-tricks-most-rails-coders-dont-kno
●
Rails Deployment -
http://manuals.rubyonrails.com/read/book/17

rubyonrails

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