fixup schema entry for updaters with explicit types

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

proxmox-api-macro/src/api/structs.rs

@@ -498,9 +498,8 @@ fn handle_updater_field(
         }
     };
 
-    field_schema.optional = field.ty.clone().into();
-
     let span = Span::call_site();
+    field_schema.optional = field.ty.clone().into();
     let updater = syn::TypePath {
         qself: Some(syn::QSelf {
             lt_token: syn::token::Lt { spans: [span] },
@@ -515,6 +514,16 @@ fn handle_updater_field(
             &["proxmox", "api", "schema", "Updatable", "Updater"],
         ),
     };
+
+    // we also need to update the schema to point to the updater's schema for `type: Foo` entries
+    if let SchemaItem::ExternType(path) = &mut field_schema.schema.item {
+        *path = syn::ExprPath {
+            attrs: Vec::new(),
+            qself: updater.qself.clone(),
+            path: updater.path.clone(),
+        };
+    }
+
     field.ty = syn::Type::Path(updater);
 
     if field_schema.flatten_in_struct {

proxmox-api-macro/tests/updater.rs

@@ -38,7 +38,7 @@ pub struct Complex {
     },
 )]
 /// One of the baaaad cases.
-#[derive(Updater)]
+#[derive(Default, Updater)]
 #[serde(rename_all = "kebab-case")]
 pub struct SuperComplex {
     /// An extra field not part of the flattened struct.