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class ActionController::Base
  # Modified version of caches_page to allow specifiying an :expire_after
  # such that the page will be expired via a background job
  # Example:
  # class PostsController < ApplicationController
  #   time_caches_page :index, :expire_after => 5.minutes
  #   .
  #   .
  # end
  def self.time_caches_page(*actions)

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module JavascriptsHelper
  # This helper yeilds contents to 2 places that should be available
  # in the application layout. One for including javascript files,
  # the other is for including initialization codes. The layout should have
  # something as follows:
  # <%= yield :javascripts %>
  # <script type="text/javascript">
  #   $(function({
  #     <%= yield :javascripts_ready %>
  #   }));

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# A simple class trying to solve the issue of defining constants in a ruby application.
# I have always tended to define constants I use as Hashes as follows
#   PersonTypes = {:good_guy => 1, :super_hero => 2}
# But the moment I needed to add more attributes, things Got Ugly
# PersonTypesInfo = {:good_guy => {:id => 1, :name => "Mr Good Guy"}, 
#                    :super_hero => {:id => 2, :name => "Mr Hero"}}
# So, here's a simple class that initializes constants that hold attributes
# and enable you to retreive them in different ways like getting all of them
# or oredring them by one of the attributes
# Example usage

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# obtained from http://snippets.dzone.com/posts/show/1727
# for the complete list (http://en.wikipedia.org/wiki/ISO_3166-1)

class CreateCountries < ActiveRecord::Migration

  def self.up
    create_table :countries do |t|
      t.column :iso, :string, :size => 2
      t.column :name, :string, :size => 80
      t.column :printable_name, :string, :size => 80

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# This is a port of the javascript code found in the following link
#http://groups.google.com/group/Google-Maps-API/browse_thread/thread/a45947d72c27cc73

class Mercator
  #offset is defined at zoom level 21 which means that this Mercator is valid for 21 zoom levels
  OFFSET = 268435456
  RADIUS = OFFSET / Math::PI
  
  def self.lng_to_x(lng, zoom)
    (OFFSET + RADIUS * lng * Math::PI / 180).to_i >> (21 - zoom)