add example

fixtures/nullable_field.json

@@ -0,0 +1,26 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://github.com/invopop/jsonschema/test-nullable-field",
+  "$ref": "#/$defs/TestNullableField",
+  "$defs": {
+    "TestNullableField": {
+      "properties": {
+        "a": {
+          "oneOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        }
+      },
+      "additionalProperties": false,
+      "type": "object",
+      "required": [
+        "a"
+      ]
+    }
+  }
+}

fixtures/nullable_from_tags_field.json

@@ -0,0 +1,19 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://github.com/invopop/jsonschema/test-nullable-field",
+  "$ref": "#/$defs/TestNullableField",
+  "$defs": {
+    "TestNullableField": {
+      "properties": {
+        "a": {
+          "type": "string"
+        }
+      },
+      "additionalProperties": false,
+      "type": "object",
+      "required": [
+        "a"
+      ]
+    }
+  }
+}

reflect_test.go

@@ -195,6 +195,10 @@ type TestNullable struct {
 	Child1 string `json:"child1" jsonschema:"nullable"`
 }
 
+type TestNullableField struct {
+	A *string `json:"a"`
+}
+
 type CompactDate struct {
 	Year  int
 	Month int
@@ -426,6 +430,8 @@ func TestSchemaGeneration(t *testing.T) {
 		{&OuterPtr{}, &Reflector{ExpandedStruct: true}, "fixtures/inlining_ptr.json"},
 		{&MinValue{}, &Reflector{}, "fixtures/schema_with_minimum.json"},
 		{&TestNullable{}, &Reflector{NullableFromJSONSchemaTags: true}, "fixtures/nullable.json"},
+		{&TestNullableField{}, &Reflector{}, "fixtures/nullable_field.json"},
+		{&TestNullableField{}, &Reflector{NullableFromJSONSchemaTags: true}, "fixtures/nullable_from_tags_field.json"},
 		{&GrandfatherType{}, &Reflector{
 			AdditionalFields: func(r reflect.Type) []reflect.StructField {
 				return []reflect.StructField{