Geremia Taglialatela tagliala

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

OBSOLETE

This entire guide is based on an old version of Homebrew/Node and no longer applies. It was only ever intended to fix a specific error message which has since been fixed. I've kept it here for historical purposes, but it should no longer be used. Homebrew maintainers have fixed things and the options mentioned don't exist and won't work.

I still believe it is better to manually install npm separately since having a generic package manager maintain another package manager is a bad idea, but the instructions below don't explain how to do that.

Fixing npm On Mac OS X for Homebrew Users

Installing node through Homebrew can cause problems with npm for globally installed packages. To fix it quickly, use the solution below. An explanation is also included at the end of this document.

	=Navigating=
	visit('/projects')
	visit(post_comments_path(post))

	=Clicking links and buttons=
	click_link('id-of-link')
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	click_button('Save')
	click('Link Text') # Click either a link or a button
	click('Button Value')

	<?php
	/*
	Plugin Name: Videos
	Plugin URI:
	Author: Dave Rupert
	Author URI: http://www.daverupert.com
	Description: A custom post type that adds videos and custom taxonomies.
	Version: 1.0
	*/

	var async = require('async');

	function doSimpleConnect(callback) {

	var Connection = require('cassandra-client').Connection;

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	-- DISCLAIMER --
	il presente elenco consiste in una raccolta di nomi presenti sul territorio italiano (non necessariamente "italiani")
	viene generato prendendo processando automaticamente uno o più archivi anagrafici e non è controllato in alcun modo
	è pertanto altamente possibile che ci siano errori o refusi
	non è nè pretende di essere un elenco omnicomprensivo di tutti i nomi esistenti
	----------------

	abaco
	abbondanza
	abbondanzia

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	/*
	Plugin Name: show Custom Post Type
	Plugin URI: http://www.offbroadway.com/
	Description: Custom post type for OffBroadway.com
	Author: Van Patten Media
	Version: 1.0
	Author URI: http://www.vanpattenmedia.com/
	*/

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	* https://developers.facebook.com/docs/opengraph/using-objects
	*
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	* Facebook will 'scrape' the HTML page of the object and read the meta tags.