From 516be35df9b77e4e92d445554730d379d168fea8 Mon Sep 17 00:00:00 2001
From: srufle <srufle@WINRUFLE005>
Date: Sun, 22 Jan 2017 10:46:51 -0700
Subject: [PATCH] Demonstrate put_in to manipulate nested struct values

---
 lib/koans/11_structs.ex           | 9 +++++++++
 test/koans/structs_koans_test.exs | 1 +
 2 files changed, 10 insertions(+)

diff --git a/lib/koans/11_structs.ex b/lib/koans/11_structs.ex
index 1c33fd5..7b4945f 100644
--- a/lib/koans/11_structs.ex
+++ b/lib/koans/11_structs.ex
@@ -45,4 +45,13 @@ defmodule Structs do
 
     assert Map.fetch(silvia, :age) == ___
   end
+
+  defmodule Airline do
+    defstruct plane: %Plane{}, name: "Southwest"
+  end
+
+  koan "Use the put_in macro to replace a nested value" do
+    airline = %Airline{plane: %Plane{maker: :boeing}}
+    assert put_in(airline.plane.maker, :airbus) == ___
+  end
 end
diff --git a/test/koans/structs_koans_test.exs b/test/koans/structs_koans_test.exs
index 92622b9..8d975fa 100644
--- a/test/koans/structs_koans_test.exs
+++ b/test/koans/structs_koans_test.exs
@@ -10,6 +10,7 @@ defmodule StructsTests do
       33,
       {:multiple, [true, false]},
       {:ok, 22},
+      %Structs.Airline{plane: %Structs.Plane{maker: :airbus}, name: "Southwest"},
     ]
 
     test_all(Structs, answers)