refactor: ChildComment 리팩토링

backend/src/main/java/aimo/backend/common/config/DataInitConfig.java

@@ -119,7 +119,6 @@ public void initializeData(MemberRepository memberRepo, PrivatePostRepository pr
 				ParentComment.builder()
 					.nickname("ParentComment" + i)
 					.content("This is a parent comment " + i)
-					.isDeleted(false)
 					.member(member)
 					.post(post)
 					.build();
@@ -135,7 +134,6 @@ public void initializeData(MemberRepository memberRepo, PrivatePostRepository pr
 					.content("This is a child comment " + i)
 					.member(member)
 					.nickname(member.getNickname())
-					.isDeleted(false)
 					.parentComment(parentComment)
 					.post(postRepo.getReferenceById(parentComment.getPost().getId()))
 					.build();

backend/src/main/java/aimo/backend/domains/comment/controller/ChildCommentController.java

@@ -14,6 +14,7 @@
 import aimo.backend.domains.comment.dto.request.SaveChildCommentRequest;
 import aimo.backend.domains.comment.dto.parameter.ValidAndDeleteParentCommentParameter;
 import aimo.backend.domains.comment.dto.parameter.ValidAndUpdateChildCommentParameter;
+import aimo.backend.domains.comment.dto.request.UpdateChildCommentRequest;
 import aimo.backend.domains.comment.service.ChildCommentService;
 import aimo.backend.common.util.memberLoader.MemberLoader;
 import jakarta.validation.Valid;
@@ -45,7 +46,7 @@ public ResponseEntity<DataResponse<Void>> saveChildComment(
 	@PutMapping("comments/child/{childCommentId}")
 	public ResponseEntity<DataResponse<Void>> updateChildComment(
 		@PathVariable Long childCommentId,
-		@Valid @RequestBody SaveChildCommentRequest request
+		@Valid @RequestBody UpdateChildCommentRequest request
 	) {
 		Long memberId = MemberLoader.getMemberId();
 

backend/src/main/java/aimo/backend/domains/comment/dto/request/SaveChildCommentRequest.java

@@ -3,11 +3,11 @@
 import jakarta.validation.constraints.Size;
 
 public record SaveChildCommentRequest(
-	@Size(max = 1500, message = "댓글은 최대 500자까지 입력할 수 있습니다.")
+	@Size(max = 500, message = "댓글은 최대 500자까지 입력할 수 있습니다.")
 	String content
 ) {
 
-	public static SaveChildCommentRequest of(String content) {
+	public static SaveChildCommentRequest from(String content) {
 		return new SaveChildCommentRequest(content);
 	}
 }

backend/src/main/java/aimo/backend/domains/comment/dto/request/UpdateChildCommentRequest.java

@@ -0,0 +1,13 @@
+package aimo.backend.domains.comment.dto.request;
+
+import jakarta.validation.constraints.Size;
+
+public record UpdateChildCommentRequest(
+	@Size(max = 500, message = "댓글은 최대 500자까지 입력할 수 있습니다.")
+	String content
+) {
+
+	public static UpdateChildCommentRequest from(String content) {
+		return new UpdateChildCommentRequest(content);
+	}
+}

backend/src/main/java/aimo/backend/domains/comment/entity/ChildComment.java

@@ -66,15 +66,14 @@ private ChildComment(
 		String nickname,
 		String content,
 		ParentComment parentComment,
-		Boolean isDeleted,
 		Member member,
 		Post post,
 		List<ChildCommentLike> childCommentLikes
 	) {
 		this.nickname = nickname;
 		this.content = content;
 		this.parentComment = parentComment;
-		this.isDeleted = isDeleted;
+		this.isDeleted = false;
 		this.member = member;
 		this.post = post;
 		this.childCommentLikes = childCommentLikes;
@@ -90,7 +89,6 @@ public static ChildComment of(
 			.nickname(member.getNickname())
 			.content(content)
 			.parentComment(parentComment)
-			.isDeleted(false)
 			.member(member)
 			.post(post)
 			.build();
@@ -106,13 +104,6 @@ public void deleteChildCommentSoftly() {
 		this.isDeleted = true;
 	}
 
-	public void deleteChildCommentSoftlyWithContent() {
-		this.member = null;
-		this.nickname = CommentConstants.DELETED_MEMBER.getValue();
-		this.isDeleted = true;
-		content = CommentConstants.DELETED_COMMENT.getValue();
-	}
-
 	public void updateChildComment(String content) {
 		this.content = content;
 	}

backend/src/main/java/aimo/backend/domains/comment/repository/ChildCommentRepository.java

@@ -5,11 +5,10 @@
 import org.springframework.data.jpa.repository.JpaRepository;
 
 import aimo.backend.domains.comment.entity.ChildComment;
-import aimo.backend.domains.member.entity.Member;
 
 public interface ChildCommentRepository extends JpaRepository<ChildComment, Long> {
 
-	Boolean existsByIdAndMember(Long id, Member member);
+	Boolean existsByIdAndMember_Id(Long id, Long memberId);
 
 	List<ChildComment> findByMemberId(Long memberId);
 }

backend/src/main/java/aimo/backend/domains/comment/service/ChildCommentService.java

@@ -29,8 +29,8 @@ public class ChildCommentService {
 	private final MemberService memberService;
 
 	//자식 댓글 권한 확인
-	private void validateChildCommentAuthority(Member member, Long childCommentId) throws ApiException {
-		Boolean exists = childCommentRepository.existsByIdAndMember(childCommentId, member);
+	private void validateChildCommentAuthority(Long memberId, Long childCommentId) throws ApiException {
+		Boolean exists = childCommentRepository.existsByIdAndMember_Id(childCommentId, memberId);
 
 		if (!exists) {
 			throw ApiException.from(UNAUTHORIZED_CHILD_COMMENT);
@@ -39,27 +39,31 @@ private void validateChildCommentAuthority(Member member, Long childCommentId) t
 
 	//자식 댓글 저장
 	@Transactional(rollbackFor = ApiException.class)
-	public void saveChildComment(SaveChildCommentParameter saveChildCommentParameter) {
-		Long postId = saveChildCommentParameter.postId();
-		Long parentCommentId = saveChildCommentParameter.parentCommentId();
-		String content = saveChildCommentParameter.content();
-		Member member = memberService.findMemberById(saveChildCommentParameter.memberId());
-		Post post = postService.findById(postId);
+	public void saveChildComment(SaveChildCommentParameter parameter) {
+		Long postId = parameter.postId();
+		Long parentCommentId = parameter.parentCommentId();
+		String content = parameter.content();
 
+		Member member = memberService.findMemberById(parameter.memberId());
+		Post post = postService.findById(postId);
 		ParentComment parentComment = parentCommentMemberService.findById(parentCommentId);
+
 		ChildComment childComment = ChildComment.of(content, member, parentComment, post);
 		childCommentRepository.save(childComment);
 	}
 
 	//자식 댓글 수정
 	@Transactional(rollbackFor = ApiException.class)
 	public void validateAndUpdateChildComment(
-		ValidAndUpdateChildCommentParameter validAndUpdateChildCommentParameter) {
-		Member member = memberService.findMemberById(validAndUpdateChildCommentParameter.memberId());
-		Long childCommentId = validAndUpdateChildCommentParameter.childCommentId();
-		String content = validAndUpdateChildCommentParameter.content();
+		ValidAndUpdateChildCommentParameter parameter
+	) {
+		Long memberId = parameter.memberId();
+		Long childCommentId = parameter.childCommentId();
+		String content = parameter.content();
+
+		// 자식 댓글 권한 확인
+		validateChildCommentAuthority(memberId, childCommentId);
 
-		validateChildCommentAuthority(member, childCommentId);
 		ChildComment childComment = childCommentRepository.findById(childCommentId)
 			.orElseThrow(() -> ApiException.from(UNAUTHORIZED_CHILD_COMMENT));
 
@@ -72,17 +76,17 @@ public void validateAndDeleteChildComment(
 		ValidAndDeleteParentCommentParameter parameter
 	) {
 		Long childCommentId = parameter.childCommentId();
-
-		Member member = memberService.findMemberById(parameter.memberId());
+		Long memberId = parameter.memberId();
 
 		// 자식 댓글 권한 확인
-		validateChildCommentAuthority(member, childCommentId);
+		validateChildCommentAuthority(memberId, childCommentId);
 
 		ParentComment parentComment = childCommentRepository.findById(childCommentId)
 			.orElseThrow(() -> ApiException.from(CHILD_COMMENT_NOT_FOUND))
 			.getParentComment();
 
 		// 자식 댓글 삭제
+		parentComment.deleteChildComment(childCommentId);
 		childCommentRepository.deleteById(childCommentId);
 
 		// 자식 댓글이 없으며 부모 댓글이 삭제된 상태면 삭제