2 3 5 6 6 7 8 9 10 11 12 13 15 16 17 18 19 20 Patterns of Enterprise Application Architecture Extreme Programming Explained -- Embrace Change 21 22 23 24 25 26 27 28 28 29 30 31 Java Ruby 31 Java Ruby Java Ruby 33 34 35 37 38 39 40 41 42 44 46 47 48 49 50 51 52 53 54 55 56 57 58 NoMethodError in Todos#show Showing todos/show.html.erb where line #18 raised: Extracted source (around line #18): Appli