dto validator error handling added

src/utils/validate-dto.utils.ts

 import { plainToInstance } from 'class-transformer';
-import { validate } from 'class-validator';
+import { validate, ValidationError } from 'class-validator';
 import { RpcException } from '@nestjs/microservices'
 
 export async function validateDto<T extends object>(
@@ -23,3 +23,25 @@ export async function validateDto<T extends object>(
 
     return dtoObject;
 }
+
+
+
+export function formatValidationErrors(errors: ValidationError[]): string {
+    const messages: string[] = [];
+
+    const extractMessages = (error: ValidationError) => {
+        if (error.constraints) {
+            // Push all constraint messages (even if from the same field)
+            messages.push(...Object.values(error.constraints));
+        }
+
+        if (error.children && error.children.length > 0) {
+            error.children.forEach(extractMessages);
+        }
+    };
+
+    errors.forEach(extractMessages);
+
+    return messages.join(', ');
+}
+