Rails Developers Meetup 2018 Day 3 Extreme 発表資料
https://techplay.jp/event/679666
YouTube: https://www.youtube.com/watch?v=1U6SDJD_sp8&t=0s&list=PLLpMWAO4_8wIvjyxzS6p1XpvpOM9v_u3z&index=48