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  def add(conn, %{"product_id" => product_id}) do
    product = Front.get_product!(product_id)

    conn = case conn.assigns[:current_order] do
      nil ->
        order = Front.create_order_with_product!(product)
        conn |> put_session(:order_id, order.id)
      order ->
        Front.add_product_to_order!(order, product)
        conn

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defmodule TranslationFields do
  @moduledoc """
  Usage:
      defmodule Product do
        use TranslationFields
        
        @translated_locales ~w(en fr)
        @translated_fields ~w(name description)

        schema "products" do

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class Foo
  def self.bar
    42
  end

  private

  def self.private_bar
    "oh noes"
  end

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!!undefined
// false
!!""
// false
!!0
// false
!!null
// false
!!1
// true

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[1, 2, 3, 4].map(res => res * 2)
// [2, 4, 6, 8]

['number', 'of', 'letters'].reduce((m, o) => m += o.length, 0)
// 15

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class WizardsController < ApplicationController
  before_action :load_user_wizard, except: %i(validate_step)

  def validate_step
    current_step = params[:current_step]

    @user_wizard = wizard_user_for_step(current_step)
    @user_wizard.user.attributes = user_wizard_params
    session[:user_attributes] = @user_wizard.user.attributes

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module Wizard
  module User
    STEPS = %w(step1 step2 step3 step4).freeze

    class Base
      include ActiveModel::Model
      attr_accessor :user

      delegate *::User.attribute_names.map { |attr| [attr, "#{attr}="] }.flatten, to: :user

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class User < ApplicationRecord
  validates :email, presence: true, format: { with: /@/ }
  validates :first_name, presence: true
  validates :last_name, presence: true
  validates :address_1, presence: true
  validates :zip_code, presence: true
  validates :city, presence: true
  validates :country, presence: true
  validates :phone_number, presence: true
end

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# config/environments/production.rb

config.action_mailer.smtp_settings = {
  :user_name => ENV['SENDGRID_USERNAME'],
  :password => ENV['SENDGRID_PASSWORD'],
  :domain => 'your_application_name.herokuapp.com',
  :address => 'smtp.sendgrid.net',
  :port => 587,
  :authentication => :plain,
  :enable_starttls_auto => true

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# Exposure pattern to use declarative interfaces in controller (which is the basic feature of the library decent_exposure).
#
# Using this pattern you can dramatically reduce or remove completely the need for instance variables in controllers and views.
#
# Example :
#
# BEFORE (traditional way in Ruby on Rails)
#
# class ArticlesController < ApplicationController
#   before_action :load_current_blog