#393 Guest User Record

rails g migration add_guest_to_users guest:boolean
rake db:migrate

<p><%= button_to "Try it for free!", users_path, method: :post %></p>

Logged in as <strong><%= current_user.name %></strong>.
<% if current_user.guest? %>
  <%= link_to "Become a member", signup_path %>
<% else %>
  <%= link_to "Log Out", logout_path %>
<% end %>

def create
  @user = params[:user] ? User.new(params[:user]) : User.new_guest
  if @user.save
    current_user.move_to(@user) if current_user && current_user.guest?
    session[:user_id] = @user.id
    redirect_to root_url
  else
    render "new"
  end
end

class User < ActiveRecord::Base
  has_many :tasks, dependent: :destroy

  attr_accessible :username, :email, :password, :password_confirmation

  validates_presence_of :username, :email, :password_digest, unless: :guest?
  validates_uniqueness_of :username, allow_blank: true
  validates_confirmation_of :password

  # override has_secure_password to customize validation until Rails 4.
  require 'bcrypt'
  attr_reader :password
  include ActiveModel::SecurePassword::InstanceMethodsOnActivation
  
  def self.new_guest
    new { |u| u.guest = true }
  end
  
  def name
    guest ? "Guest" : username
  end
  
  def move_to(user)
    tasks.update_all(user_id: user.id)
  end
end

namespace :guests do
  desc "Remove guest accounts more than a week old."
  task :cleanup => :environment do
    User.where(guest: true).where("created_at < ?", 1.week.ago).destroy_all
  end
end