refactor: 유저조회 id 활용하게 수정

Author: sapiens2000

src/main/java/com/example/log4u/domain/user/controller/UserController.java

@@ -90,13 +90,13 @@ public ResponseEntity<UserProfileResponseDto> getMyProfile(
 		return ResponseEntity.ok(userProfileResponseDto);
 	}
 
-	@GetMapping("/{nickname}")
+	@GetMapping("/{id}")
 	public ResponseEntity<UserProfileResponseDto> getUserProfile(
 		@AuthenticationPrincipal CustomOAuth2User customOAuth2User,
-		@PathVariable String nickname
+		@PathVariable Long id
 	) {
 		UserProfileResponseDto userProfileResponseDto =
-			userService.getUserProfile(nickname);
+			userService.getUserProfileById(id);
 		return ResponseEntity.ok(userProfileResponseDto);
 	}
 

src/main/java/com/example/log4u/domain/user/service/UserService.java

@@ -38,14 +38,13 @@ public UserProfileResponseDto getMyProfile(Long userId) {
 		);
 	}
 
-	public UserProfileResponseDto getUserProfile(String nickname) {
-		User target = getUserByNickname(nickname);
-		final Long targetId = target.getUserId();
+	public UserProfileResponseDto getUserProfileById(Long id) {
+		User target = getUserById(id);
 
 		return UserProfileResponseDto.fromUser(
 			target,
-			followRepository.countByTargetId(targetId),
-			followRepository.countByInitiatorId(targetId)
+			followRepository.countByTargetId(id),
+			followRepository.countByInitiatorId(id)
 		);
 	}