Handle required flattened Option fields

schemars/tests/expected/validate.json

@@ -14,7 +14,8 @@
     "regex_str1",
     "regex_str2",
     "required_option",
-    "tel"
+    "tel",
+    "x"
   ],
   "properties": {
     "min_max": {
@@ -76,6 +77,10 @@
     },
     "required_option": {
       "type": "boolean"
+    },
+    "x": {
+      "type": "integer",
+      "format": "int32"
     }
   }
 }

schemars/tests/validate.rs

@@ -32,6 +32,14 @@ pub struct Struct {
     map_contains: HashMap<String, ()>,
     #[validate(required)]
     required_option: Option<bool>,
+    #[validate(required)]
+    #[serde(flatten)]
+    required_flattened: Option<Inner>,
+}
+
+#[derive(Debug, JsonSchema)]
+pub struct Inner {
+    x: i32,
 }
 
 #[test]