changed return type to dto

src/main/java/com/app/bookstore/controller/OrderController.java

@@ -61,7 +61,7 @@ public OrderResponseDto updateStatus(
             summary = "Get all items by order id",
             description = "Retrieve all OrderItems for a specific order"
     )
-    public List<OrderItem> getAllById(@PathVariable Long id) {
+    public List<OrderItemResponseDto> getAllById(@PathVariable Long id) {
         return orderItemService.getAllById(id);
     }
 

src/main/java/com/app/bookstore/dto/order/item/OrderItemResponseDto.java

@@ -1,4 +1,10 @@
 package com.app.bookstore.dto.order.item;
 
+import lombok.Data;
+
+@Data
 public class OrderItemResponseDto {
+    private Long id;
+    private Long bookId;
+    private int quantity;
 }

src/main/java/com/app/bookstore/service/order/item/OrderItemService.java

@@ -6,7 +6,7 @@
 
 public interface OrderItemService {
 
-    List<OrderItem> getAllById(Long id);
+    List<OrderItemResponseDto> getAllById(Long id);
 
     OrderItemResponseDto getItemById(Long id, Long itemId);
 }

src/main/java/com/app/bookstore/service/order/item/OrderItemServiceImpl.java

@@ -16,8 +16,11 @@ public class OrderItemServiceImpl implements OrderItemService {
     private final OrderItemMapper orderItemMapper;
 
     @Override
-    public List<OrderItem> getAllById(Long id) {
-        return orderItemRepository.findAllById(id);
+    public List<OrderItemResponseDto> getAllById(Long id) {
+        List<OrderItem> items = orderItemRepository.findAllById(id);
+        return items.stream()
+                .map(orderItemMapper::toDto)
+                .toList();
     }
 
     @Override