e-jambon

module Destroyable
  def call_destructor(id)
    @destructors[id].each do |o|
      o.__destroy(id) if o.respond_to? :__destroy
    end
    @destructors.delete(id)
  end
  
  def is_destroyable
    @destructors = {}

e-jambon

class Foo
  attr_reader :bar
  def initialize
    @bar = 123
    ObjectSpace.define_finalizer( self, self.class.finalize(bar) )
  end

  def self.finalize(bar)
    proc { puts "DESTROY OBJECT #{bar}" }
  end

e-jambon

require 'tty'
require 'tty-prompt'

prompt = TTY::Prompt.new
answer = prompt.select("my question") do |item|
  item.choice  'One', 'Pika'
  item.choice  "Two", 'Boo'
end

puts "My answer was : #{answer}"

e-jambon

ItemMenu = Struct.new(:lvl, :description, :command_type, :data) do


  def action
    puts "data = " + data.inspect
  end
  
  def save_to filepath
    File.open( filepath, 'w+' ) do |f|
      Marshal.dump(self,f)

e-jambon

class String
  def to_proc
    eval "Proc.new { |*args| args.first#{self} }"
  end
end

e-jambon

Design patterns (in Ruby)

Design patterns are just tools that help us constructing a software.

Template Method pattern

In the Template Method pattern, we create a skeletal class and it is basis for various subclasses or concrete classes. Within in the skeletal class, there are abstract methods, which in turn, will be overridden by the methods of subclasses.

Let's take an example of simple payment system,

e-jambon

require 'rails_helper'

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

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

e-jambon

Rails mailer structure

Your application is growing, and you are starting to have a complex mailing system: notification emails, retention emails, misc user emails, admin emails, etc...

It's time to clean up your mailers !

Existing mailer

You may already have a single mailer, responsible of every emails, like this one:

e-jambon

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

e-jambon

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')