Matheus Richard MatheusRich

Como criar uma gem ruby?

Escolhi tratar sobre esse assunto hoje simplesmente porque foi uma das primeiras coisas que me perguntei "como eu faço isso?" no mundo ruby. Acredito que muita gente se pergunte a mesma coisa e espero que eu possa ajudar em algo para elas. 😀

O que é uma gem?

Bem, se você é um programador java, você chama sua gem de jar, se você é um programador C#, você chama de dll. Resumindo, é uma lib, uma biblioteca contendo códigos que você pode reaproveitar importando em outros projetos.

E usar gems no ruby é muito fácil, se você já deu uma brincada com rails por exemplo, é só você adicionar o código gem 'nome_da_gem' no arquivo Gemfile que está no root, depois executar o comando bundle install para baixar sua gem do repositório e pronto, só sair usando a biblioteca!

One of the many reasons I love working with Ruby is it has a rich vocabulary that allows you to accomplish your goals with a minimal amount of code. If there isn't a method that does exactly what you want, it's usually possible to build an elegant solution yourself.

Let's take the example of simulating the rolling of a die.

We can represent a die as an array of its faces.

die = [*?⚀..?⚅]
# => ["⚀", "⚁", "⚂", "⚃", "⚄", "⚅"]

Add gem 'rails_12factor' to your Gemfile. This will add error logging and the ability for your app to serve static assets.
bundle
Run RAILS_ENV=production rake db:create db:migrate db:seed
Run rake secret and copy the output
From the command line: export SECRET_KEY_BASE=output-of-rake-secret
To precompile your assets, run rake assets:precompile. This will create a folder public/assets that contains all of your assets.
Run RAILS_ENV=production rails s and you should see your app.

Remember to clobber your assets (rake assets:clobber) and re-precompile (rake assets:precompile) if you make changes.

Capybara Selenium WebDriver running at a lower speed using sleep command

Ever wanted to run your integration/end-to-end test suite at a lower speed so that you better could observe what's happening and perhaps make a recording of it?

Here's a a technique I've been using when writing tests with Capybara Selenium WebDriver.

Put this in test/test_helper.rb or maybe something like spec/support/capybara.rb.

	#!/bin/ruby

	include HTTParty

	fields = []
	fields << {"Name" => "rocksoftware22", "Component" => "precise4"}
	fields << {"Name" => "rocksoftware", "Component" => "precise5"}

	params_hash ={}
	params_hash[:Sources] = fields

	require "active_record"

	ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
	ActiveRecord::Migration.class_eval do
	create_table(:records) do \|t\|
	t.string :column
	end
	end

	data = 50_000.times.map { \|i\| Hash[column: "Column #{i}"] }

	# Return 'YYYY-MM-DD HH:MM:SS' string for current time, using local timezone.
	def timestamp()
	Time.now.strftime '%Y-%m-%d %H:%M:%S'
	end

	require 'benchmark'
	require 'ostruct'

	REP = 1000000

	User = Struct.new(:name, :age)

	USER = "User".freeze
	AGE = 21
	HASH = {:name => USER, :age => AGE}.freeze

	require 'result/ok'
	require 'result/error'

	#
	# A generic representation of success and failure.
	#
	# Styled after the Result monad of Elm and Rust
	# (or the Either monad of Haskell).
	#
	# The `#and_then` method can be used to chain functions that

	#!/bin/bash
	# A simple bash script that creates a custom git command to ignore ALL kinds of
	# modifications (untracked files, modified files, etc)

	# Installation: run `sudo sh git-cagate.sh`
	# Usage: run `git cagate` to ignore ALL modifications

	cd /bin/ \|\| exit
	touch git-cagate
	echo "touch .empty" >> git-cagate