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module CustomValidators

  class Emails
    def self.email_validator
      /\A(|(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6})\z/i
    end
  end

  class Numbers
    def self.phone_number_validator

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class Service  
   def initialize  
     @interval = 1.0  
     @start_time = Time.now   
   end  
   def start   
     # Update the start-time  
     @start_time = Time.now   
     # run loop  
     loop do  

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flash.each do |key, value|
   puts "#{key}"
   puts "#{value}"
end

Calling sort on a hash converts it into nested arrays and then sorts them by key, so all you need is this:

puts h.sort.map {|k,v| ["#{k}----"] + v}

puts h.sort

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Single Table Inheritance in Rails 3

What is Single Table Inheritance?

STI allows you to create subclasses of a particular database table. 
Using a single table, you can cast rows to specific objects that extend the base model.

How to create STI relationships in Rails

Lets say we have a model Computer

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First the DDL:

CREATE TABLE node (
 id SERIAL,
 label TEXT NOT NULL, -- name of the node
 parent_id INT,
 PRIMARY KEY(id)
);
NOTICE:  CREATE TABLE will create implicit sequence "node_id_seq" for serial column "node.id"
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "node_pkey" for table "node"

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# Author: Pieter Noordhuis
# Description: Simple demo to showcase Redis PubSub with EventMachine
#
# Update 7 Oct 2010:
# - This example does *not* appear to work with Chrome >=6.0. Apparently,
#   the WebSocket protocol implementation in the cramp gem does not work
#   well with Chrome's (newer) WebSocket implementation.
#
# Requirements:
# - rubygems: eventmachine, thin, cramp, sinatra, yajl-ruby

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#! /bin/sh
### BEGIN INIT INFO
# Provides:		redis-server
# Required-Start:	$syslog
# Required-Stop:	$syslog
# Should-Start:		$local_fs
# Should-Stop:		$local_fs
# Default-Start:	2 3 4 5
# Default-Stop:		0 1 6
# Short-Description:	redis-server - Persistent key-value db