From 7ccca52210a0b54f7599b862ff5a36297a104037 Mon Sep 17 00:00:00 2001
From: Simon Sawert <simon@sawert.se>
Date: Wed, 11 Oct 2023 23:22:06 +0200
Subject: [PATCH] Fix when first item is nullable.

Closes #2
---
 inferred_schema.go |  3 +--
 inferrer_test.go   | 12 ++++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/inferred_schema.go b/inferred_schema.go
index f7a7405..ca3766a 100644
--- a/inferred_schema.go
+++ b/inferred_schema.go
@@ -75,7 +75,7 @@ func (i *InferredSchema) Infer(value any, hints Hints) *InferredSchema {
 	if i.SchemaType == SchemaTypeNullable {
 		return &InferredSchema{
 			SchemaType: SchemaTypeNullable,
-			Nullable:   i,
+			Nullable:   i.Nullable.Infer(value, hints),
 		}
 	}
 
@@ -258,7 +258,6 @@ func (i *InferredSchema) Infer(value any, hints Hints) *InferredSchema {
 			if subInfer, ok := i.Properties.Required[k]; ok {
 				i.Properties.Required[k] = subInfer.Infer(v, hints.SubHints(k))
 			} else if subInfer, ok := i.Properties.Optional[k]; ok {
-				i.Properties.Optional = ensureMap(i.Properties.Optional)
 				i.Properties.Optional[k] = subInfer.Infer(v, hints.SubHints(k))
 			} else {
 				i.Properties.Optional = ensureMap(i.Properties.Optional)
diff --git a/inferrer_test.go b/inferrer_test.go
index 91bde3b..bb460dc 100644
--- a/inferrer_test.go
+++ b/inferrer_test.go
@@ -43,6 +43,18 @@ func TestInferString(t *testing.T) {
 				},
 			},
 		},
+		{
+			description: "object first is null",
+			values:      []string{`{"name":null}`, `{"name":"Joe"}`},
+			expectedSchema: Schema{
+				Properties: map[string]Schema{
+					"name": {
+						Type:     jtd.TypeString,
+						Nullable: true,
+					},
+				},
+			},
+		},
 		{
 			description: "array",
 			values:      []string{`[1, 2, 3]`},