♻️ refactor: UserMapper에 toSignupResponse() 추가

Author: jiwon1217

backend/src/main/java/io/f1/backend/domain/user/app/UserService.java

@@ -1,16 +1,15 @@
 package io.f1.backend.domain.user.app;
 
+import static io.f1.backend.domain.user.mapper.UserMapper.toSignupResponse;
+
 import io.f1.backend.domain.user.dao.UserRepository;
 import io.f1.backend.domain.user.dto.SessionUser;
 import io.f1.backend.domain.user.dto.SignupRequestDto;
 import io.f1.backend.domain.user.dto.SignupResponseDto;
 import io.f1.backend.domain.user.entity.User;
 import io.f1.backend.global.util.SecurityUtils;
-
 import jakarta.servlet.http.HttpSession;
-
 import lombok.RequiredArgsConstructor;
-
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -32,7 +31,7 @@ public SignupResponseDto signup(HttpSession session, SignupRequestDto signupRequ
         updateSessionAfterSignup(session, user);
         SecurityUtils.setAuthentication(user);
 
-        return SignupResponseDto.toDto(user);
+        return toSignupResponse(user);
     }
 
     private SessionUser extractSessionUser(HttpSession session) {
@@ -63,7 +62,7 @@ private void validateDuplicateNickname(String nickname) {
 
     private User updateUserNickname(Long userId, String nickname) {
         User user =
-                userRepository.findById(userId).orElseThrow(() -> new RuntimeException("사용자 없음"));
+            userRepository.findById(userId).orElseThrow(() -> new RuntimeException("사용자 없음"));
         user.updateNickname(nickname);
 
         return userRepository.save(user);

backend/src/main/java/io/f1/backend/domain/user/dto/SignupResponseDto.java

@@ -1,22 +1,5 @@
 package io.f1.backend.domain.user.dto;
 
-import io.f1.backend.domain.user.entity.User;
+public record SignupResponseDto(Long id, String nickname) {
 
-import lombok.AllArgsConstructor;
-import lombok.Builder;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-
-@Getter
-@Builder
-@NoArgsConstructor
-@AllArgsConstructor
-public class SignupResponseDto {
-
-    private Long id;
-    private String nickname;
-
-    public static SignupResponseDto toDto(User user) {
-        return SignupResponseDto.builder().id(user.getId()).nickname(user.getNickname()).build();
-    }
 }

backend/src/main/java/io/f1/backend/domain/user/mapper/UserMapper.java

@@ -0,0 +1,14 @@
+package io.f1.backend.domain.user.mapper;
+
+import io.f1.backend.domain.user.dto.SignupResponseDto;
+import io.f1.backend.domain.user.entity.User;
+
+public class UserMapper {
+
+    private UserMapper() {
+    }
+
+    public static SignupResponseDto toSignupResponse(User user) {
+        return new SignupResponseDto(user.getId(), user.getNickname());
+    }
+}