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Recently, I had a staging database on Heroku that was running on the Ronin database (which was originally the lowest-sized DB you could get at Heroku). Since they added two new options, Crane and Kappa, we wanted to take advantage of the cost savings. Here's how you can migrate your Ronin DB to Crane (or any other plan).

The old database was named BROWN while the new one is CRIMSON. You can determine this by running:

heroku pg:info --app myapp-staging

Add Crane database

 heroku addons:add heroku-postgresql:crane --app myapp-staging

heroku pg:wait --app myapp-staging

Setting up and installing rbenv, ruby-build, rubies, rbenv-gemset, and bundler

This guide enables you to install (ruby-build) and use (rbenv) multiple versions of ruby, isolate project gems (gemsets and/or bundler), and automatically use appropriate combinations of rubies and gems.

TL;DR Demo

# Ensure system is in ship-shape.

aptitude install git zsh libssl-dev zlib1g-dev libreadline-dev libyaml-dev

Sublime Text 2 – Useful Shortcuts (Mac OS X)

General

⌘T	go to file
⌘⌃P	go to project
⌘R	go to methods
⌃G	go to line
⌘KB	toggle side bar
⌘⇧P	command prompt

	Dir.glob("*/.png").each do \|file\|
	['pngnq -e .png -f', 'pngquant -f -speed 1 -ext .png', 'pngcrush'].each do \|command\|
	puts "#{command} #{file}"
	`#{command} #{file}`
	end
	end

	#!/usr/bin/env ruby

	require 'test/unit'

	class TestSums < Test::Unit::TestCase

	def setup
	@a = [2, 5, 18, 27]
	@sum = 0
	end

	require 'factory_girl_rails'
	require 'rspec'
	require 'rspec-rails'
	require 'rspec/mocks/standalone' # => if factories need stubs (for remote services for example)

	include FactoryGirl::Syntax::Methods # make FG methods available at top level, so you can do `> create :user`

	def reload_factories!
	FactoryGirl.instance_variable_set(:@factories, nil) # => clear loaded factories/sequences
	# FactoryGirl.instance_variable_set(:@sequences, nil)

	class Api::RegistrationsController < Api::BaseController

	respond_to :json
	def create

	user = User.new(params[:user])
	if user.save
	render :json=> user.as_json(:auth_token=>user.authentication_token, :email=>user.email), :status=>201
	return
	else