# lib/cacher.rb
module Cacher
  STORE = {}
  
  def cache(*args)
    STORE[args.inspect] ||= yield
  end

  def flush!
    STORE.clear
  end
  module_function :flush!
end

# app/models/person.rb
class Person < AR::Base
  include Cacher

  def finger
    cache(:finger, email) do
      `finger #{email}`
    end
  end
end

# app/controller/application.rb
class ApplicationController < AC::Base
  after_filter { Cacher.flush! }
end

class ApplicationController < ActionController::Base
  before_filter :update_session_expiration_date

private
  def update_session_expiration_date
    unless ActionController::Base.session_options[:session_expires]
      ActionController::Base.session_options[:session_expires] = 1.year.from_now
    end
  end
end

class Test::Unit::TestCase
  def self.all_fixtures
    Dir[File.dirname(__FILE__) + "/fixtures/*.yml"].each do |f|
      fixtures File.basename(f, '.yml')
    end
  end

  ..
end

class FooTest < Test::Unit::TestCase
  all_fixtures

  ..
end

def attr_protected?(record, column)
  o = instance_variable_get("@#{record}")
  o && o.class.protected_attributes &&
      o.class.protected_attributes.include?(column.name.to_sym)
end

def default_input_block
  Proc.new { |record, column|
    options = attr_protected?(record, column) ? {:disabled => true} : {}
    <<-"end_html" 
      <p>
        <label for="#{record}_#{column.name}">#{column.human_name}</label>
        <br />
        #{input(record, column.name, options)}
      </p>
    end_html
  }
end

class Item < ActiveRecord::Base
  attr_protected :created_at
end

Event.observe(window, 'load', function() {
  var e = $A(document.getElementsByTagName('*')).find(function(e) {
    return (e.tagName.toUpperCase() == 'INPUT' && (e.type == 'text' || e.type == 'password'))
        || e.tagName.toUpperCase() == 'TEXTAREA' || e.tagName.toUpperCase() == 'SELECT';
  });
  if (e) e.focus();
});

# = ActiveForm - non persistent ActiveRecord
#
# Simple base class to make AR objects without a corresponding database
# table.  These objects can still use AR validations but can't be saved
# to the database.  Use the +valid?+ method to validate.
#
# == Example
#
#   class FeedbackForm < ActiveForm
#     column :email
#     column :message
#     validates_presence_of :email, :message
#   end
#
class ActiveForm < ActiveRecord::Base
  def self.columns() @columns ||= []; end # :nodoc:
  
  # Define an attribute, takes the same arguments as
  # ActiveRecord::ConnectionAdapters::Column.new only in a
  # slightly different order.
  def self.column(name, sql_type = nil, default = nil, null = true)
    columns << ActiveRecord::ConnectionAdapters::Column.new(
        name.to_s, default, sql_type.to_s, null)
  end
end

  def xml_encode(text)
    text.unpack('c*').map{|c|"&\##{c};"}.join
  end

  def url_encode(text)
    text.split('').map{|c|"%#{c.unpack('H2')}"}.join
  end

  <a href="<%= xml_encode("mailto:" + url_encode("somebody@somewhere.net")) %>">mail somebody</a>

  <a href="&#109;&#97;&#105;&#108;&#116;&#111;&#58;&#37;&#55;&#51;&#37;&#54;&#102;&#37;&#54;&#100;&#37;&#54;&#53;&#37;&#54;&#50;&#37;&#54;&#102;&#37;&#54;&#52;&#37;&#55;&#57;&#37;&#52;&#48;&#37;&#55;&#51;&#37;&#54;&#102;&#37;&#54;&#100;&#37;&#54;&#53;&#37;&#55;&#55;&#37;&#54;&#56;&#37;&#54;&#53;&#37;&#55;&#50;&#37;&#54;&#53;&#37;&#50;&#101;&#37;&#54;&#101;&#37;&#54;&#53;&#37;&#55;&#52;">mail somebody</a>