Denis Savitskiy sadfuzzy

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

If you are using vagrant, you probably-statistically are using git. Make sure you have its binary folder on your path, because that path contains 'ssh.exe'.

Now, modify C:\vagrant\vagrant\embedded\lib\ruby\gems\1.9.1\gems\vagrant-1.0.3\lib\vagrant\ssh.rb to comment out the faulty Windows check and add a real SSH check:

# if Util::Platform.windows?
  # raise Errors::SSHUnavailableWindows, :host => ssh_info[:host],
                                       # :port => ssh_info[:port],
                                       # :username => ssh_info[:username],
 # :key_path =&gt; ssh_info[:private_key_path]

My issues with Modules

In researching topics for RailsCasts I often read code in Rails and other gems. This is a great exercise to do. Not only will you pick up some coding tips, but it can help you better understand what makes code readable.

A common practice to organize code in gems is to divide it into modules. When this is done extensively I find it becomes very difficult to read. Before I explain further, a quick detour on instance_eval.

You can find instance_eval used in many DSLs: from routes to state machines. Here's an example from Thinking Sphinx.

class Article &lt; ActiveRecord::Base

Abstract

You could have postgre installed on localhost with password (or without user or password seted after instalation) but if we are developing we really don't need password, so configuring postgre server without password for all your rails project is usefull.

Install Postgre packages

postgresql
postgresql-client
libpq-dev

	# As root user
	sudo su

	# Update the OS
	sudo apt-get update -y

	# Add this to ~/.bashrc to remove timezone warnings
	echo 'export LC_ALL="en_US.UTF-8"' >> ~/.bashrc
	source ~/.bashrc

	require 'gollum/frontend/app'
	require 'digest/sha1'

	class App < Precious::App
	User = Struct.new(:name, :email, :password_hash, :can_write)

	before { authenticate! }
	before /^\/(edit\|create\|delete\|livepreview\|revert)/ do authorize_write! ; end

	helpers do

	# place this in lib/fakeout.rb

	require 'ffaker'

	module Fakeout
	class Builder

	FAKEABLE = %w(User Product)

	attr_accessor :report

	Follow the instructions here: The Hitchhiker's Guide to Riding a
	Mountain Lion http://j.mp/Qm5UJD, including installing XQuartz.

	After installing XQuartz set the correct path to the X11 library to
	install Ruby 1.8.7-p358 with rbenv:

	export CPPFLAGS=-I/opt/X11/include

	then let the compiler know where gcc-4.2 is:

	# bundle exec rake cache:clear
	namespace :cache do
	desc "Clear Rails.cache"
	task :clear do
	Object.const_set "RAILS_CACHE", ActiveSupport::Cache.lookup_store(Rails.configuration.cache_store)
	Rails.cache.clear
	puts "Successfully cleared Rails.cache!"
	end
	end

	When installing passenger, Nginx, Ruby and Rails on Ubuntu 12.04 (without RVM/without rbenv):

	First: installing Ruby (without RVM):

	sudo apt-get update

	sudo apt-get install ruby1.9.1 ruby1.9.1-dev \
	rubygems1.9.1 irb1.9.1 ri1.9.1 rdoc1.9.1 \
	build-essential libopenssl-ruby1.9.1 libssl-dev zlib1g-dev