Feat: 특정 상품 주문하기의 RequestBody 검증 구현

- 만약 count가 음수라면 400(Bad Request) 상태코드를 반환한다.

BE/src/main/java/sidedish/com/controller/OrderController.java

@@ -1,13 +1,14 @@
 package sidedish.com.controller;
 
-import java.util.Map;
+import javax.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.ResponseStatus;
 import org.springframework.web.bind.annotation.RestController;
+import sidedish.com.controller.model.OrderSaveRequest;
 import sidedish.com.controller.model.OrderSaveResponse;
 import sidedish.com.service.OrderService;
 
@@ -19,8 +20,7 @@ public class OrderController {
 
     @PostMapping("/api/products/{id}/order")
     @ResponseStatus(HttpStatus.CREATED)
-    public OrderSaveResponse order(@PathVariable Long id, @RequestBody Map<String, Long> orderRequest) {
-        long count = orderRequest.get("count");
-        return orderService.save(id, count);
+    public OrderSaveResponse order(@PathVariable Long id, @RequestBody @Valid OrderSaveRequest orderSaveRequest) {
+        return orderService.save(id, orderSaveRequest.getCount());
     }
 }

BE/src/main/java/sidedish/com/controller/model/OrderSaveRequest.java

@@ -0,0 +1,11 @@
+package sidedish.com.controller.model;
+
+import javax.validation.constraints.Positive;
+import lombok.Getter;
+
+@Getter
+public class OrderSaveRequest {
+
+    @Positive
+    private Long count;
+}