From f49ccae17cd4af5fea30864a3fe4f36f0c32d2c8 Mon Sep 17 00:00:00 2001
From: CorneliaKelinske <corneliakelinske@gmail.com>
Date: Fri, 2 Jun 2023 10:59:34 -0700
Subject: [PATCH] handle nil return (#18)

---
 lib/cache/term_encoder.ex      | 1 +
 test/cache/redis_json_test.exs | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/lib/cache/term_encoder.ex b/lib/cache/term_encoder.ex
index 67eb660..9798ddd 100644
--- a/lib/cache/term_encoder.ex
+++ b/lib/cache/term_encoder.ex
@@ -62,6 +62,7 @@ defmodule Cache.TermEncoder do
     value
   end
 
+  def decode_json(nil), do: nil
   def decode_json(json) do
     case Jason.decode(json) do
       {:ok, data} -> data
diff --git a/test/cache/redis_json_test.exs b/test/cache/redis_json_test.exs
index a5a4043..961608b 100644
--- a/test/cache/redis_json_test.exs
+++ b/test/cache/redis_json_test.exs
@@ -37,6 +37,10 @@ defmodule Cache.RedisJSONTest do
         "some_map" => %{"one" => 1, "two" => 2, "three" => 3, "four" => 4}
       }} === RedisCache.json_get(key)
     end
+
+    test "returns :ok and nil if key not found" do
+      assert {:ok, nil} === RedisCache.json_get("non_existing")
+    end
   end
 
   describe "&json_get/2" do