refactor: 차단 버그 해결 (#81)

src/main/java/com/ddabong/ddabongdotchiBE/domain/blacklist/controller/BlacklistController.java

@@ -4,13 +4,11 @@
 
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
-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.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
-import com.ddabong.ddabongdotchiBE.domain.blacklist.dto.request.BlacklistCreateRequest;
 import com.ddabong.ddabongdotchiBE.domain.blacklist.dto.response.BlacklistCreateResponse;
 import com.ddabong.ddabongdotchiBE.domain.blacklist.dto.response.BlacklistGetResponse;
 import com.ddabong.ddabongdotchiBE.domain.blacklist.service.BlacklistQueryService;
@@ -31,23 +29,26 @@ public class BlacklistController {
 	private final BlacklistService blacklistService;
 	private final BlacklistQueryService blacklistQueryService;
 
+	/* 차단하기 */
 	@PostMapping("")
 	public ApiResponse<BlacklistCreateResponse> createBlacklist(
 		@UserResolver User authUser,
-		@RequestBody BlacklistCreateRequest request
+		@RequestParam Long targetId
 	) {
-		return ApiResponse.onSuccess(blacklistService.createBlacklist(authUser, request));
+		return ApiResponse.onSuccess(blacklistService.createBlacklist(authUser, targetId));
 	}
 
+	/* 차단 목록 조회 */
 	@GetMapping("")
 	public ApiResponse<List<BlacklistGetResponse>> getBlacklist(@UserResolver User user) {
 		return ApiResponse.onSuccess(blacklistQueryService.getBlacklist(user));
 	}
 
-	@DeleteMapping("/{targetId}")
+	/* 차단 해제 */
+	@DeleteMapping("")
 	public ApiResponse<String> deleteBlacklist(
 		@UserResolver User user,
-		@PathVariable Long targetId
+		@RequestParam Long targetId
 	) {
 		blacklistService.deleteBlacklist(user, targetId);
 		return ApiResponse.onSuccess("삭제 성공");

src/main/java/com/ddabong/ddabongdotchiBE/domain/blacklist/service/BlacklistQueryService.java

@@ -20,6 +20,7 @@ public class BlacklistQueryService {
 
 	private final BlacklistRepository blacklistRepository;
 
+	/* 차단 목록 조회 */
 	public List<BlacklistGetResponse> getBlacklist(User user) {
 		return blacklistRepository.findByUser(user)
 			.stream()

src/main/java/com/ddabong/ddabongdotchiBE/domain/blacklist/service/BlacklistService.java

@@ -3,7 +3,6 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
-import com.ddabong.ddabongdotchiBE.domain.blacklist.dto.request.BlacklistCreateRequest;
 import com.ddabong.ddabongdotchiBE.domain.blacklist.dto.response.BlacklistCreateResponse;
 import com.ddabong.ddabongdotchiBE.domain.blacklist.entity.Blacklist;
 import com.ddabong.ddabongdotchiBE.domain.blacklist.exception.BlacklistErrorCode;
@@ -26,21 +25,35 @@ public class BlacklistService {
 	private final BlacklistRepository blacklistRepository;
 	private final UserRepository userRepository;
 
-	public BlacklistCreateResponse createBlacklist(User user, BlacklistCreateRequest request) {
+	/* 차단하기 */
+	public BlacklistCreateResponse createBlacklist(User user, Long targetId) {
 
-		if (user.getUsername().equals(request.target()))
+		// 사용자가 자신의 ID를 차단하려는 경우 예외 발생
+		if (user.getId().equals(targetId)) {
 			throw new BlacklistExceptionHandler(BlacklistErrorCode.BLACKLIST_ERROR);
+		}
 
-		final User target = userRepository.findByUsername(request.target())
+		// 대상 사용자를 userRepository 조회
+		User target = userRepository.findById(targetId)
 			.orElseThrow(() -> new UserExceptionHandler(UserErrorCode.USER_NOT_FOUND));
 
-		if (blacklistRepository.existsByUserAndTarget(user, target))
+		// 이미 차단한 사용자인지 확인
+		if (blacklistRepository.existsByUserAndTarget(user, target)) {
 			throw new BlacklistExceptionHandler(BlacklistErrorCode.BLACKLIST_ALREADY_REPORTED);
+		}
+
+		// 차단 정보 저장
+		Blacklist blacklist = blacklistRepository.save(
+			Blacklist.builder()
+				.user(user)   // 차단 요청을 한 사용자
+				.target(target) // 차단 대상 사용자
+				.build()
+		);
 
-		Blacklist blacklist = blacklistRepository.save(request.toEntity(user, target));
 		return BlacklistCreateResponse.from(blacklist);
 	}
 
+	/* 차단 해제 */
 	public void deleteBlacklist(User user, Long targetId) {
 		final Blacklist blacklist = blacklistRepository.findByUserAndTargetId(user, targetId)
 			.orElseThrow(() -> new BlacklistExceptionHandler(BlacklistErrorCode.BLACKLIST_NOT_FOUND));

src/main/java/com/ddabong/ddabongdotchiBE/domain/user/repository/UserRepository.java

@@ -8,6 +8,8 @@ public interface UserRepository {
 
 	Optional<User> findByUsername(String username);
 
+	Optional<User> findById(Long id);
+
 	Boolean existsByUsername(String username);
 
 	Boolean existsByNickname(String nickname);

src/main/java/com/ddabong/ddabongdotchiBE/domain/user/repository/UserRepositoryImpl.java

@@ -19,6 +19,11 @@ public Optional<User> findByUsername(String username) {
 		return userJpaRepository.findByUsername(username);
 	}
 
+	@Override
+	public Optional<User> findById(Long id) {
+		return userJpaRepository.findById(id);
+	}
+
 	@Override
 	public Boolean existsByUsername(String username) {
 		return userJpaRepository.existsByUsername(username);