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#!/bin/ruby --verion => 2.0.0-p353

Self

In Ruby, self is a special variable that always references the current object.

Inside class or module definition, self refer to the Class or Module object.
Inside instance method, self refer to future instance object.
Inside class method, self refer to the class.i

#Cucumber and Capybara - Behavior Driven Development

##Overview

Cucumber allows software developers to describe how software should behave in plain text. The text is written in a business-readable, domain-specific language. This allows non-programmers to write specific feature requests that can be turned into automated tests that drive development of the project.

Capybara is the largest rodent known to man.

Interactor Gem (Service object)

It is based on the Command pattern, where each Command class/object represents a task and has one public method. Basically, something like:

PressButton.new(button).execute # or
PurchaseOrder.new(params).call # or even
Song::Create.(params) # or a proc
SendEmail.perform(email) # it could be a class method, why not?

	# this monit config goes in /etc/monit/conf.d

	check process puma_master
	with pidfile /data/myapp/current/tmp/puma.pid
	start program = "/etc/monit/scripts/puma start"
	stop program = "/etc/monit/scripts/puma stop"
	group myapp

	check process puma_worker_0
	with pidfile /data/myapp/current/tmp/puma_worker_0.pid

	INSTALL JAVA
	$ sudo apt-get update && sudo apt-get install default-jre

	INSTALL ELASTIC SEARCH https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-repositories.html
	$ wget -qO - https://packages.elastic.co/GPG-KEY-elasticsearch \| sudo apt-key add -
	$ echo "deb https://packages.elastic.co/elasticsearch/2.x/debian stable main" \| sudo tee -a /etc/apt/sources.list.d/elasticsearch-2.x.list
	$ sudo apt-get update && sudo apt-get install elasticsearch
	$ sudo update-rc.d elasticsearch defaults 95 10
	$ sudo service elasticsearch restart
	$ sudo service elasticsearch status

	http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
	http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

	#payload: [{"kind"=>"person"}]
	Segment.where("payload @> ?", [{kind: "person"}].to_json)

	#data: {"interest"=>["music", "movies", "programming"]}
	Segment.where("data @> ?", {"interest": ["music", "movies", "programming"]}.to_json)
	Segment.where("data #>> '{interest, 1}' = 'movies' ")
	Segment.where("jsonb_array_length(data->'interest') > 1")

	#!/bin/bash

	set -e

	CURRENT_NAME="CurrentName"
	CURRENT_OTP="current_name"

	NEW_NAME="NewName"
	NEW_OTP="new_name"

	FROM madnight/docker-alpine-wkhtmltopdf as wkhtmltopdf_savior

	# STAGE for bundle & yarn install
	FROM ruby:2.4.3-alpine3.7 as builder

	ENV CA_CERTS_PATH /etc/ssl/certs/
	ENV RAILS_ENV production
	ENV RAILS_LOG_TO_STDOUT true
	ENV RAILS_SERVE_STATIC_FILES true

	# ...

	gem 'carrierwave'
	gem 'fog', '~> 1.0.0' # Need to specify version, as carrierwave references older (0.9.0) which doesn't allow configuration of Rackspace UK Auth URL