Murilo Mothsin murilomothsin

Transactions

As your business logic gets complex you may need to implement transactions. The classic example is a bank funds transfer from account A to account B. If the withdrawal from account A fails then the deposit to account B should either never take place or be rolled back.

Basics

All the complexity is handled by ActiveRecord::Transactions. Any model class or instance has a method named .transaction. When called and passed a block, that block will be executed inside a database transaction. If there's an exception raised, the transaction will automatically be rolled back.

Example

Use apache2 with Passenger

Required

CentOS

$ cat /etc/redhat-release 
CentOS release 6.5 (Final)

gcc-c++

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

	#!/bin/sh
	#
	# redis - this script starts and stops the redis-server daemon
	#
	# chkconfig: - 85 15
	# description: Redis is a persistent key-value database
	# processname: redis-server
	# config: /etc/redis/redis.conf
	# config: /etc/sysconfig/redis
	# pidfile: /var/run/redis.pid

	var redis = require("redis")
	, subscriber = redis.createClient()
	, publisher = redis.createClient();

	subscriber.on("message", function(channel, message) {
	console.log("Message '" + message + "' on channel '" + channel + "' arrived!")
	});

	subscriber.subscribe("test");

	/*
	* Original script by: Shafiul Azam
	* Version 4.0
	* Modified by: Luigi Balzano

	* Description:
	* Inserts Countries and/or States as Dropdown List
	* How to Use:

	In Head section:

	/* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software


	/*
	##Device = Desktops
	##Screen = 1281px to higher resolution desktops
	*/

	@media (min-width: 1281px) {

	/* CSS */