Andreas Finger mediafinger

Ruby / Rails app gem dependencies

Best practices

Whenever possible rely on rubygems

source "https://rubygems.org"
Always restrict the gem version, but keep the restriction relaxed with the squiggly operator:
- gem 'gem_name', '~> 3.2' is equivalent to: gem 'gem_name', '>= 3.2', '< 4.0'
Prefer '~> 3.2' over '~> 3.2.0' to be able to update the gem up to the next major version

Keybase proof

I hereby claim:

I am mediafinger on github.
I am mediafinger (https://keybase.io/mediafinger) on keybase.
I have a public key ASB1L24f0S2zUaUlx1TYm5wkZSpHZ5CmNV669H5laiYlTwo

To claim this, I am signing this object:

(Micro) Benchmarking Crystal vs Ruby

ips = iterations per second

Hamming distance, multiple implementations

See code examples below.

Crystal

Setup Ruby and configure a new Rails app

This is a step by step guide for everyone new to Ruby and Ruby on Rails - or for people who want to create a new Rails app on a new computer. And it is also a reminder for myself to check which gems and settings I like in Rails apps.

Setting up a skeleton for a new Rails app

Example: an admin interface named "dtx_admin"

This guide assumes you've already installed a current ruby (version 2.6.1 by time of writing this) and the gems rails (version 5.2.x) and bundler (version 2.0.1 or newer) on your machine. It was written on macOS on might assume you use homebrew. Nevertheless you should be able to follow it on Linux or the Linux DSL in Win10 or even under Windows itself.

tl;dr

If you don't want to read a guide, but just have a somewhat-setup minimal Rails app, you'll find a more current one (Ruby 3.0, Rails 6.1) here https://github.com/mediafinger/minimal which you can use as a start or template for your own app. The commits are described in its README.

JSON Web Token (JWT)

We need a way to make authenticated calls from one (self-owned) service to another (self-owned) service.

Secret

We can start with a simple setup, where both services know the used secret.

It is a good practice to implement endpoints to request new secrets which have an expiration time. Another possibility is to set up JWT authentication using an asymmetric algorithm (such as RS256) where the authentication server has a secret key, and the application server has a public key.

	[user]
	name = Your Name
	email = [email protected]
	[github]
	user = nickname
	[alias]
	b = branch
	co = checkout
	st = status
	d = diff --staged

	# Task:
	# implement different ways to split a string at a line-break character into lines
	# for the sake of simplicity these examples use "0" as "line-break" character


	# this solves only a part of the task recursivly
	def detect_first_line(string, line = "", position = 0)
	return line if string[position] == "0"

	puts "#{position}, #{string[position]}, #{line}"

	-- A global variable for the Hyper Mode
	hyper = hs.hotkey.modal.new({}, 'F17')


	-- Enter Hyper Mode when F18 (Hyper/Capslock) is pressed
	function enterHyperMode()
	hyper.triggered = false
	hyper:enter()
	end

	require: rubocop-rspec

	AllCops:
	TargetRubyVersion: 2.6
	DisplayCopNames: true
	Exclude:
	- config.ru
	- bin/**
	- db/schema.rb
	- node_modules/*/