OpenAPI: Fix switcher default value being ignored

.changeset/nervous-bats-shake.md

@@ -0,0 +1,5 @@
+---
+'fumadocs-openapi': patch
+---
+
+Fix switcher default value being ignored

examples/openapi/openapi.json

@@ -1235,6 +1235,36 @@
                       "trialEnds": "2023-06-16T17:16:37.161Z"
                     }
                   },
+                  "parameters": {
+                    "type": "object",
+                    "required": ["media_input"],
+                    "properties": {
+                      "media_input": {
+                        "oneOf": [
+                          {
+                            "title": "Image Media",
+                            "type": "object",
+                            "properties": {
+                              "type": {
+                                "type": "string",
+                                "const": "image"
+                              },
+                              "url": {
+                                "type": "string"
+                              }
+                            },
+                            "required": ["type", "url"],
+                            "examples": [
+                              {
+                                "type": "image",
+                                "url": "https://example.com/image.png"
+                              }
+                            ]
+                          }
+                        ]
+                      }
+                    }
+                  },
                   "roles": {
                     "type": "array",
                     "items": {

packages/openapi/src/ui/playground/fetcher.ts

@@ -171,12 +171,20 @@ function convertValue(
   }
 
   if (schema.type === 'switcher') {
-    const schema = resolve(
-      getDynamicFieldSchema(fieldName, dynamicFields),
+    return convertValue(
+      fieldName,
+      value,
+      resolve(
+        getDynamicFieldSchema(
+          fieldName,
+          dynamicFields,
+          Object.values(schema.items).at(0),
+        ),
+        references,
+      ),
       references,
+      dynamicFields,
     );
-
-    return convertValue(fieldName, value, schema, references, dynamicFields);
   }
 
   if (typeof value === 'object' && schema.type === 'object') {
@@ -231,10 +239,12 @@ function convertValue(
 function getDynamicFieldSchema(
   name: string,
   dynamicFields: Map<string, DynamicField>,
+  defaultValue?: RequestSchema | ReferenceSchema,
 ): RequestSchema | ReferenceSchema {
   const field = dynamicFields.get(name);
 
-  return field?.type === 'field'
-    ? field.schema
-    : { type: 'null', isRequired: false };
+  if (field?.type === 'field') return field.schema;
+  if (defaultValue) return defaultValue;
+
+  return { type: 'null', isRequired: false };
 }