Scott Yu scootcho

Packages

lxml - Pythonic binding for the C libraries libxml2 and libxslt.
boto - Python interface to Amazon Web Services
Django - Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.
Fabric - Library and command-line tool for streamlining the use of SSH for application deployment or systems administration task.
PyMongo - Tools for working with MongoDB, and is the recommended way to work with MongoDB from Python.
Celery - Task queue to distribute work across threads or machines.
pytz - pytz brings the Olson tz database into Python. This library allows accurate and cross platform timezone calculations using Python 2.4 or higher.

Guides

CarrierWave home

https://github.com/jnicklas/carrierwave

This example will create an uploader that will upload a file stored in a model Model. The file will be stored locally in development and test environment and will use Amazon S3 in production.

CarrierWave installation

First add the gems.

UPDATE: It's a gem!

This helper has finally been moved into a gem called nav_lynx!

https://github.com/vigetlabs/nav_lynx

http://rubygems.org/gems/nav_lynx

Thanks to @brianjlandau and @reagent for getting that set up and tested!

Behold, the nav_link:

Polymorphism

Sometimes relationships need to be flexible, and that's where we look to polymorphism. Say we want to implement:

A Person
A Company
A PhoneNumber that can connect to a Person or a Company

At the Database Level

Background

Cory Foy recently wrote an article entitled, Procedural Polymorphism: Is your code really telling you to use an if statement?. Corey Haines has been talking about this same topic for a while. Sandi Metz covers the topic in Practical Object-Oriented Design in Ruby. Ben Rady and Rod Coffin discussed using the Null-Object pattern instead of an if statement in Continuous Testing with Ruby, Rails, and JavaScript.

Printing in Conway's Game of Life

That is, very smart people whom I admire agree that, in general,

class DeadCell

	#!/bin/bash
	echo Provisioning Ruby on Rails...
	echo =================================

	echo - Installing dependencies
	sudo apt-get update -y -qq > /dev/null
	sudo apt-get install curl -y -qq > /dev/null

	echo - Installing mysql server
	export DEBIAN_FRONTEND=noninteractive

	# be sure to comment out the require 'capistrano/deploy' line in your Capfile!

	# config valid only for Capistrano 3.1
	lock '3.2.1'

	set :application, 'my-cool-application'

	# the base docker repo reference
	set :name, "johns-stuff/#{fetch(:application)}"

	/*
	Some simple Github-like styles, with syntax highlighting CSS via Pygments.
	*/
	body{
	font-family: helvetica, arial, freesans, clean, sans-serif;
	color: #333;
	background-color: #fff;
	border: none;
	line-height: 1.5;
	margin: 2em 3em;

	Vim for Rails
	==================
	----------

	### Brief history of Vi and Vim

	Before the appearance of the famous operating system UNIX, the text editor “ed” appeared, which was written by Ken Thompson in 1971. ed is regarded as one of the oldest text editors ever, and it is also regarded as the first to implement the concept of Regular Expressions.

	After that period the “ex” text editor appeared which is short for “EXtend” to add some features to “ed” and to make it simpler.

	# ...

	gem 'carrierwave'
	gem 'fog', '~> 1.0.0' # Need to specify version, as carrierwave references older (0.9.0) which doesn't allow configuration of Rackspace UK Auth URL