🐞 fix: make update fields always optional

Author: m1212e

src/generators/plain.ts

@@ -31,7 +31,7 @@ export function processPlain(models: DMMF.Model[] | Readonly<DMMF.Model[]>) {
 export function stringifyPlain(
   data: DMMF.Model,
   isInputModelCreate = false,
-  isInputModelUpdate = false,
+  isInputModelUpdate = false
 ) {
   const annotations = extractAnnotations(data.documentation);
 
@@ -111,7 +111,7 @@ export function stringifyPlain(
       } else if (processedEnums.find((e) => e.name === field.type)) {
         // biome-ignore lint/style/noNonNullAssertion: we checked this manually
         stringifiedType = processedEnums.find(
-          (e) => e.name === field.type,
+          (e) => e.name === field.type
         )!.stringRepresentation;
       } else {
         return undefined;
@@ -125,10 +125,11 @@ export function stringifyPlain(
 
       if (!field.isRequired) {
         stringifiedType = wrapWithNullable(stringifiedType);
-        if (isInputModelUpdate) {
-          stringifiedType = wrapWithOptional(stringifiedType);
-          madeOptional = true;
-        }
+      }
+
+      if (isInputModelUpdate) {
+        stringifiedType = wrapWithOptional(stringifiedType);
+        madeOptional = true;
       }
 
       if (