jpashop : 컬렉션 조회 v3 (dto 응답, fetch join, distinct)

jpashop/src/main/java/com/example/jpashop/api/OrderApiController.java

@@ -36,4 +36,12 @@ public class OrderApiController {
                 .map(OrderDto::new)
                 .collect(Collectors.toList());
     }
+
+    @GetMapping("/api/v3/orders")
+    public List<OrderDto> ordersV3() {
+        List<Order> orders = orderRepository.findAllWithItem();
+        return orders.stream()
+                .map(OrderDto::new)
+                .collect(Collectors.toList());
+    }
 }

jpashop/src/main/java/com/example/jpashop/repository/OrderRepository.java

@@ -103,4 +103,14 @@ public class OrderRepository {
                         " join fetch o.delivery", Order.class)
                 .getResultList();
     }
+
+    public List<Order> findAllWithItem() {
+        return em.createQuery(
+                "select distinct o from Order o" +
+                        " join fetch o.member m" +
+                        " join fetch o.delivery d" +
+                        " join fetch o.orderItems oi" +
+                        " join fetch oi.item i", Order.class)
+                .getResultList();
+    }
 }