From 1ed77c405d23d58efe075aa2251ab909666ff43f Mon Sep 17 00:00:00 2001
From: Conrad Taylor <conradwt@gmail.com>
Date: Tue, 21 Dec 2021 20:11:07 -0800
Subject: [PATCH 1/2] Upgrade docs and associated implementation code.

---
 README.md                              | 2 +-
 lib/zero_phoenix_web/graphql/schema.ex | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index bcff29c..94d3e05 100644
--- a/README.md
+++ b/README.md
@@ -434,8 +434,8 @@ Note: This tutorial was updated on macOS 11.6.2.
           arg :id, non_null(:id)
           resolve fn %{id: id}, _info ->
             case ZeroPhoenix.Person|> Repo.get(id) do
-              nil  -> {:error, "Person id #{id} not found"}
               person -> {:ok, person}
+              nil  -> {:error, "Person id #{id} not found"}
             end
           end
         end
diff --git a/lib/zero_phoenix_web/graphql/schema.ex b/lib/zero_phoenix_web/graphql/schema.ex
index b131096..17cbbf2 100644
--- a/lib/zero_phoenix_web/graphql/schema.ex
+++ b/lib/zero_phoenix_web/graphql/schema.ex
@@ -13,8 +13,8 @@ defmodule ZeroPhoenixWeb.Graphql.Schema do
 
       resolve(fn %{id: id}, _info ->
         case Person |> Repo.get(id) do
-          nil -> {:error, "Person id #{id} not found"}
           person -> {:ok, person}
+          nil -> {:error, "Person id #{id} not found"}
         end
       end)
     end

From eea75f588664be9698b107732bed6787083066c8 Mon Sep 17 00:00:00 2001
From: Conrad Taylor <conradwt@gmail.com>
Date: Tue, 21 Dec 2021 20:51:54 -0800
Subject: [PATCH 2/2] Refactor resolver.

---
 README.md                              | 22 +++++++++++++---------
 lib/zero_phoenix_web/graphql/schema.ex | 10 ++++++----
 2 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/README.md b/README.md
index 94d3e05..fe1b99c 100644
--- a/README.md
+++ b/README.md
@@ -425,21 +425,25 @@ Note: This tutorial was updated on macOS 11.6.2.
     defmodule ZeroPhoenixWeb.Graphql.Schema do
       use Absinthe.Schema
 
-      import_types ZeroPhoenix.Graphql.Types.Person
+      import_types(ZeroPhoenixWeb.Graphql.Types.Person)
 
-      alias ZeroPhoenix.Repo
+      alias ZeroPhoenix.Account.Person
+      alias ZeroPhoenix.Account
 
       query do
         field :person, type: :person do
-          arg :id, non_null(:id)
-          resolve fn %{id: id}, _info ->
-            case ZeroPhoenix.Person|> Repo.get(id) do
-              person -> {:ok, person}
-              nil  -> {:error, "Person id #{id} not found"}
+          arg(:id, non_null(:id))
+
+          resolve(fn %{id: id}, _info ->
+            case Account.get_person(id) do
+              %Person{} = person ->
+                {:ok, person}
+
+              _error ->
+                {:error, "Person id #{id} not found"}
             end
-          end
+          end)
         end
-      end
     end
     ```
 
diff --git a/lib/zero_phoenix_web/graphql/schema.ex b/lib/zero_phoenix_web/graphql/schema.ex
index 17cbbf2..7d9d318 100644
--- a/lib/zero_phoenix_web/graphql/schema.ex
+++ b/lib/zero_phoenix_web/graphql/schema.ex
@@ -3,7 +3,6 @@ defmodule ZeroPhoenixWeb.Graphql.Schema do
 
   import_types(ZeroPhoenixWeb.Graphql.Types.Person)
 
-  alias ZeroPhoenix.Repo
   alias ZeroPhoenix.Account.Person
   alias ZeroPhoenix.Account
 
@@ -12,9 +11,12 @@ defmodule ZeroPhoenixWeb.Graphql.Schema do
       arg(:id, non_null(:id))
 
       resolve(fn %{id: id}, _info ->
-        case Person |> Repo.get(id) do
-          person -> {:ok, person}
-          nil -> {:error, "Person id #{id} not found"}
+        case Account.get_person(id) do
+          %Person{} = person ->
+            {:ok, person}
+
+          _error ->
+            {:error, "Person id #{id} not found"}
         end
       end)
     end