raffle.rb

ENV["RAILS_ENV"] ||= "development"
require File.expand_path('../config/environment', __FILE__)

rewards = {
  1000 => 1,
  100 => 5,
  50 => 10,
  20 => 50
}

tickets = []
User.all.each do |user|
  user.raffle_tickets.times do
    tickets << user.email
  end
end

tickets.shuffle!

final = []

rewards.each do |reward, count|
  count.times do
    winner = tickets.pop
    tickets.delete(winner) # only 1 reward per winner
    u = User.where(email: winner).first
    puts "#{u.first_name} #{u.last_name[0]}. #{winner} wins #{reward}"

    final << ["#{u.first_name} #{u.last_name[0]}.", reward, u.email, u.raffle_tickets]
  end
end

pp final