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h = {:asdf => 'toto', :titi => 42}
 => {:asdf=>"toto", :titi=>42}
h2 = HashWithIndifferentAccess.new(h)
...

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class Round < ActiveRecord::Base
  belongs_to :season
...

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class User < ActiveRecord::Base
  has_many :classrooms
...

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class Announcement < ActiveRecord::Base
  ANNONCEMENT_TYPES = {'squad'    => :deliver_squad_announcement,
...

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add_index(:accounts, [:branch_id, :party_id], :unique => true)

...

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zcat database_dump.sql.gz | mysql -u username -h host -p password database

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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

...