jpashop : get data api v2 (entity -> DTO)

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

@@ -8,6 +8,7 @@ import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
 
 import java.util.List;
+import java.util.stream.Collectors;
 
 /**
  * xToOne (ManyToOne, OneToOne)
@@ -30,4 +31,19 @@ public class OrderSimpleApiController {
         });
         return all;
     }
+
+    /**
+     *  ORDER ->
+     *
+     */
+    @GetMapping("/api/v2/simple-orders")
+    public List<SimpleOrderDto> ordersV2() {
+        // LAZY 로딩
+        // ORDER N개 조회
+        // N + 1 -> 1 + 회원 N + 배송 N -> 불필요 조회 문제
+        List<Order> orders = orderRepository.findAllByString(new OrderSearch());
+        return orders.stream()
+                .map(SimpleOrderDto::new)
+                .collect(Collectors.toList());
+    }
 }

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

@@ -0,0 +1,28 @@
+package com.example.jpashop.api;
+
+import com.example.jpashop.domain.Address;
+import com.example.jpashop.domain.Order;
+import com.example.jpashop.domain.OrderStatus;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Data
+public class SimpleOrderDto {
+
+    private Long orderId;
+    private String name;
+    private LocalDateTime orderDate;
+    private OrderStatus orderStatus;
+    private Address address;
+
+    public SimpleOrderDto(Order o) {
+        this.orderId = o.getId();
+        this.name = o.getMember().getName(); // LAZY 초기화
+        this.orderDate = o.getOrderDate();
+        this.orderStatus = o.getStatus();
+        this.address = o.getDelivery().getAddress(); // LAZY 초기화
+    }
+}