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Ruby: The future of frozen string literals

What is a literal?

In programming languages, literals are textual representations of values in the source code. This is a syntactical concept.

Some examples:

7 # integer literal

Business Logic / Domain Model structures for Ruby, Rails

adomokos/light-service
- Series of Actions with an emphasis on simplicity.
collectiveidea/interactor
- Interactor provides a common interface for performing complex interactions in a single request.
cypriss/mutations
- Compose your business logic into commands that sanitize and validate input.
orgsync/active_interaction
Manage application specific business logic.

Install software-properties-common

sudo apt-get install software-properties-common

Add Repo

sudo add-apt-repository ppa:olipo186/git-auto-deploy

Configure server for deploy rails app

Objective

Prepare a server for a Rails app with MySQL (percona) + NGINX (passenger)
Deploy rails app in new server with Capistrano v3

For this example we need :

server
git repo with rails app (here i use ruby 2.1.1 and rails 4.1.2)
knife solo (http://matschaffer.github.io/knife-solo/)

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)

Previous versions used homebrew to install the various versions. As suggested in the comments, it's better to use pyenv instead. If you are looking for the previous version of this document, see the revision history.

$ brew update
$ brew install pyenv
$ pyenv install 3.5.0
$ pyenv install 3.4.3
$ pyenv install 3.3.6
$ pyenv install 3.2.6
$ pyenv install 2.7.10

$ pyenv install 2.6.9

Products

index of products 25 first

curl -i -H "X-Spree-Token: YOUR_TOKEN_ID" http://0.0.0.0:3000/api/products.json

Show a product

curl -i -H "X-Spree-Token: YOUR_TOKEN_ID" http://0.0.0.0:3000/api/products/706676762.json

Modify a product

curl -i -X PUT -H "X-Spree-Token: YOUR_TOKEN_ID" -d "product[name]=Headphones" http://0.0.0.0:3000/api/products/706676762.json

	require 'rails_helper'

	RSpec.describe TodosController, :type => :controller do

	describe "GET #index" do
	#describe "POST #create" do
	#describe "GET #show" do
	#describe "PATCH #update" do (or PUT #update)
	#describe "DELETE #destroy" do
	#describe "GET #new" do

	# lib/capistrano/tasks/config_files.cap
	#
	# Capistrano task to upload configuration files outside SCM
	# Jesus Burgos Macia
	#
	# This allows us to have server's config files isolated from development ones.
	# That's useful for several reasons, but the most important is that you can
	# ignore files from repository.
	#
	# The task will upload all files found in