Alvin Kato J.R. alvinkatojr

#Simple Authentication with Bcrypt

This tutorial is for adding authentication to a vanilla Ruby on Rails app using Bcrypt and has_secure_password.

The steps below are based on Ryan Bates's approach from Railscast #250 Authentication from Scratch (revised).

You can see the final source code here: repo. I began with a stock rails app using rails new gif_vault

##Steps

Goals of this tutorial:

deploy a new Rails app with capistrano
make it fast (total process takes less than 5 minutes)
make it simple (no unecessary config)
manual ssh to the server not required

Rails application stack:

nginx
unicorn
postgresql

Architecture in Elm

This document is a collection of concepts and strategies to make large Elm projects modular and extensible.

We will start by thinking about the structure of signals in our program. Broadly speaking, your application state should live in one big foldp. You will probably merge a bunch of input signals into a single stream of updates. This sounds a bit crazy at first, but it is in the same ballpark as Om or Facebook's Flux. There are a couple major benefits to having a centralized home for your application state:

There is a single source of truth. Traditional approaches force you to write a decent amount of custom and error prone code to synchronize state between many different stateful components. (The state of this widget needs to be synced with the application state, which needs to be synced with some other widget, etc.) By placing all of your state in one location, you eliminate an entire class of bugs in which two components get into inconsistent states. We also think yo

If you're writing web applications with Ruby there comes a time when you might need something a lot simpler, or even faster, than Ruby on Rails or the Sinatra micro-framework. Enter Rack.

Rack describes itself as follows:

Rack provides a minimal interface between webservers supporting Ruby and Ruby frameworks.

Before Rack came along Ruby web frameworks all implemented their own interfaces, which made it incredibly difficult to write web servers for them, or to share code between two different frameworks. Now almost all Ruby web frameworks implement Rack, including Rails and Sinatra, meaning that these applications can now behave in a similar fashion to one another.

At it's core Rack provides a great set of tools to allow you to build the most simple web application or interface you can. Rack applications can be written in a single line of code. But we're getting ahead of ourselves a bit.

	#########################################
	# Very basic rack application showing how to use a router based on the uri
	# and how to process requests based on the HTTP method used.
	#
	# Usage:
	# $ rackup rack_example.ru
	#
	# $ curl -X POST -d 'title=retire&body=I should retire in a nice island' localhost:9292/ideas
	# $ curl -X POST -d 'title=ask Satish for a gift&body=Find a way to get Satish to send me a gift' localhost:9292/ideas
	# $ curl localhost:9292/ideas

	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

	#!/bin/sh

	# based on guide from Microsoft https://docs.microsoft.com/en-us/visualstudio/mac/uninstall

	# Uninstall Visual Studio for Mac
	echo "Uninstalling Visual Studio for Mac ..."

	sudo rm -rf "/Applications/Visual Studio.app"
	rm -rf ~/Library/Caches/VisualStudio
	rm -rf ~/Library/Preferences/VisualStudio

	scroll = File.read('data.txt').chomp

	input_string = "abcdefghijklmnopqrstuvwxyz_"

	# Sort the input string by the number of characters that appear in the scroll text
	#
	# I - string
	# P
	# O - string

	#!/bin/sh

	git filter-branch --env-filter '

	OLD_EMAIL="your-old-email@example.com"
	CORRECT_NAME="Your Correct Name"
	CORRECT_EMAIL="your-correct-email@example.com"

	if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
	then