From c3a5c7c5f4a47e9c3ca9f9d987dfa8eff9341c10 Mon Sep 17 00:00:00 2001
From: Graham Esau <gesau@hotmail.co.uk>
Date: Thu, 23 May 2024 17:21:16 +0100
Subject: [PATCH] Fix "null" default not being set on schema

Fixes #295
---
 schemars/src/_private.rs             | 2 +-
 schemars/tests/default.rs            | 1 +
 schemars/tests/expected/default.json | 7 +++++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/schemars/src/_private.rs b/schemars/src/_private.rs
index 657244b1..5b031780 100644
--- a/schemars/src/_private.rs
+++ b/schemars/src/_private.rs
@@ -161,7 +161,7 @@ pub mod metadata {
     add_metadata_fn!(add_deprecated, deprecated, bool);
     add_metadata_fn!(add_read_only, read_only, bool);
     add_metadata_fn!(add_write_only, write_only, bool);
-    add_metadata_fn!(add_default, default, Value);
+    add_metadata_fn!(add_default, default, Option<Value>);
 
     pub fn add_examples<I: IntoIterator<Item = Value>>(schema: Schema, examples: I) -> Schema {
         let mut schema_obj = schema.into_object();
diff --git a/schemars/tests/default.rs b/schemars/tests/default.rs
index fbc1033b..ab489f5e 100644
--- a/schemars/tests/default.rs
+++ b/schemars/tests/default.rs
@@ -30,6 +30,7 @@ where
 struct MyStruct {
     my_int: i32,
     my_bool: bool,
+    my_optional_string: Option<String>,
     #[serde(serialize_with = "custom_serialize")]
     my_struct2: MyStruct2,
     #[serde(
diff --git a/schemars/tests/expected/default.json b/schemars/tests/expected/default.json
index aefef83d..4155d53c 100644
--- a/schemars/tests/expected/default.json
+++ b/schemars/tests/expected/default.json
@@ -12,6 +12,13 @@
       "default": false,
       "type": "boolean"
     },
+    "my_optional_string": {
+      "default": null,
+      "type": [
+        "string",
+        "null"
+      ]
+    },
     "my_struct2": {
       "default": "i:0 b:false",
       "allOf": [