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Alex's Rails Cheat Sheet

I think the most confusing thing that I have found about Ruby on Rails so far has been the transition from (trying to) write code myself to the use of the fabled "Rails Magic". So, to help my own understanding of a few core Ruby on Rails concepts, I have decided to write something on what I think is a CRITICAL topic... the idea of Convention over Configuration and why (in my mind) it is the most important thing that helps Rails become magic!

(This may be a topic that we cover in more detail in class but as I said, I'm writing this for my own understanding... I hope it helps someone else understand things too... Perhaps you can give me a hand when I'm crying next week!)

##Convention over configuration ###What does this "actually" mean...

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

blog about these tools

Setup Zsh and Prezto

Change default shell to Zsh

chsh -s $(which zsh)

Clone Presto and install it according to README.md

Exporting (iCloud) Keychain and Safari credentials to a CSV file

Update (October 2021)

Exporting password + one-time code data from iCloud Keychain is now officially supported in macOS Monterey and Safari 15 (for Monterey, Big Sur, and Catalina). You can access it in the Password Manager’s “gear” icon (System Preferences > Passwords on Monterey, and Safari > Passwords everywhere else), or via the File > Export > Passwords... menu item). You shouldn't need to hack up your own exporter anymore.

Original, Obsolete Content (2014)

After my dad died, I wanted to be able to have access any of his online accounts going forward. My dad was a Safari user and used iCloud Keychain to sync his credentials across his devices. I don’t want to have to keep an OS X user account around just to access his accounts, so I wanted to export his credentials to a portable file.

	group :production do
	gem 'unicorn'

	# Enable gzip compression on heroku, but don't compress images.
	gem 'heroku-deflater'

	# Heroku injects it if it's not in there already
	gem 'rails_12factor'
	end

	unless Rails.env.production?
	connection = ActiveRecord::Base.connection
	connection.tables.each do \|table\|
	connection.execute("TRUNCATE #{table}") unless table == "schema_migrations"
	end

	sql = File.read('db/import.sql')
	statements = sql.split(/;$/)
	statements.pop

	// Bug fixes for current versions.

	//
	// This server will start a bash shell and expose it
	// over socket.io to a browser. See ./term.html for the
	// client side.
	//
	// You should probably:
	//
	// npm install socket.io

	<html lang="en">
	<head>
	<title>CodeMirror in Action</title>

	<script src="js/vendor/jquery-1.9.1.js"></script>

	<!-- More examples at http://codemirror.net/demo/ -->

	<!-- add basic CodeMirror functionality -->
	<script src="js/vendor/codemirror-4.1/lib/codemirror.js" type="text/javascript" charset="utf-8"></script>

	import argparse
	import json
	import re
	import os
	from time import time

	parser = argparse.ArgumentParser(description='Convert to Quiver Format')
	parser.add_argument("src", help="The Source File You want to Convert")
	args = parser.parse_args()
	cells = []