fix: align admin profile request validation

myteamwallet_backend/src/users/admin-users.controller.spec.ts

@@ -69,6 +69,22 @@ describe('AdminUsersController', () => {
 });
 
 describe('admin user DTOs', () => {
+  it('accepts omitted and string profile names but rejects explicit nulls', async () => {
+    const omitted = plainToInstance(AdminUserProfileDto, {});
+    const names = plainToInstance(AdminUserProfileDto, {
+      firstName: 'Ada',
+      lastName: 'Admin',
+    });
+    const nulls = plainToInstance(AdminUserProfileDto, {
+      firstName: null,
+      lastName: null,
+    });
+
+    expect(await validate(omitted)).toEqual([]);
+    expect(await validate(names)).toEqual([]);
+    expect(await validate(nulls)).not.toEqual([]);
+  });
+
   it('accepts only profile names in the profile DTO', async () => {
     const dto = plainToInstance(AdminUserProfileDto, {
       firstName: 'Ada',

myteamwallet_backend/src/users/dto/admin-user.dto.ts

@@ -7,20 +7,21 @@ import {
   Max,
   MaxLength,
   Min,
+  ValidateIf,
 } from 'class-validator';
 import { RoleEnum } from '../../roles/roles.enum';
 import { StatusEnum } from '../../statuses/statuses.enum';
 
 export class AdminUserProfileDto {
-  @IsOptional()
+  @ValidateIf((_, value) => value !== undefined)
   @IsString()
   @MaxLength(255)
-  firstName?: string | null;
+  firstName?: string;
 
-  @IsOptional()
+  @ValidateIf((_, value) => value !== undefined)
   @IsString()
   @MaxLength(255)
-  lastName?: string | null;
+  lastName?: string;
 }
 
 export class AdminUserRoleDto {