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def caesar(text, shift)
  text.split('').collect {|letter| (letter[0] + shift).chr}.join
end

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class Account < ActiveRecord::Base
  has_many :websites
...

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class MyaccountController < ApplicationController
  before_filter :load_users, :only => [ 'account_details', 'show_email_box', 'show_mobile_box' ]
...

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def update_foo_and_bar
  # You can also use @foo.class.transaction and @foo.bar.class.transaction if you have multiple database at the same time
  ActiveRecord::Base.transaction {@foo.update_attributes!(params[:foo]) and @foo.bar.update_attributes!(params[:bar])}
...

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xml = REXML::Document.new(data)

artists = xml.elements.to_a('//artist')[0..limit].collect do |artist|
...

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['foo', 'bar', 'baz'].each_with_index {|j, i| puts "#{i} #{j}"}

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# Rails < 2.0
Carrier.find(:all).collect {|d| [d.id, d.name]}.flatten

...