From ab7f32372f59eb288d403a06a5c294854f39c88e Mon Sep 17 00:00:00 2001
From: AntonioJRM1998 <48281301+AntonioJRM1998@users.noreply.github.com>
Date: Thu, 5 Jun 2025 17:13:13 +0200
Subject: [PATCH] Fix: IsOptional decorator incorrectly ignores validations for
 null values

Fix implementation to ensure @IsOptional only ignores validations when properties are undefined/missing, not when they're explicitly null.
---
 src/decorator/common/IsOptional.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/decorator/common/IsOptional.ts b/src/decorator/common/IsOptional.ts
index 38204c5659..1c4d26a077 100644
--- a/src/decorator/common/IsOptional.ts
+++ b/src/decorator/common/IsOptional.ts
@@ -18,7 +18,7 @@ export function IsOptional(validationOptions?: ValidationOptions): PropertyDecor
       propertyName: propertyName,
       constraints: [
         (object: any, value: any): boolean => {
-          return object[propertyName] !== null && object[propertyName] !== undefined;
+          return propertyName in object;
         },
       ],
       validationOptions: validationOptions,