feat: (#129) 게시글 댓글 목록 조회 기능 구현

backend/src/main/java/com/votogether/domain/post/dto/response/CommentResponse.java

@@ -0,0 +1,33 @@
+package com.votogether.domain.post.dto.response;
+
+import com.votogether.domain.member.entity.Member;
+import com.votogether.domain.post.entity.comment.Comment;
+import java.time.LocalDateTime;
+
+public record CommentResponse(
+ Long id,
+ CommentMember member,
+ String content,
+ LocalDateTime createdAt,
+ LocalDateTime updatedAt
+) {
+
+ public static CommentResponse from(final Comment comment) {
+ return new CommentResponse(
+ comment.getId(),
+ CommentMember.from(comment.getMember()),
+ comment.getContent(),
+ comment.getCreatedAt(),
+ comment.getUpdatedAt()
+ );
+ }
+
+ record CommentMember(Long id, String nickname) {
+
+ public static CommentMember from(final Member member) {
+ return new CommentMember(member.getId(), member.getNickname());
+ }
+
+ }
+
+}

backend/src/main/java/com/votogether/domain/post/service/PostCommentService.java

@@ -3,13 +3,15 @@
 import com.votogether.domain.member.entity.Member;
 import com.votogether.domain.post.dto.request.CommentRegisterRequest;
 import com.votogether.domain.post.dto.request.CommentUpdateRequest;
+import com.votogether.domain.post.dto.response.CommentResponse;
 import com.votogether.domain.post.entity.Post;
 import com.votogether.domain.post.entity.comment.Comment;
 import com.votogether.domain.post.exception.CommentExceptionType;
 import com.votogether.domain.post.exception.PostExceptionType;
 import com.votogether.domain.post.repository.CommentRepository;
 import com.votogether.domain.post.repository.PostRepository;
 import com.votogether.exception.NotFoundException;
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -38,6 +40,17 @@ public void createComment(
  post.addComment(comment);
  }
 
+ @Transactional(readOnly = true)
+ public List<CommentResponse> getComments(final Long postId) {
+ final Post post = postRepository.findById(postId)
+ .orElseThrow(() -> new NotFoundException(PostExceptionType.POST_NOT_FOUND));
+
+ return commentRepository.findAllByPostOrderByCreatedAtAsc(post)
+ .stream()
+ .map(CommentResponse::from)
+ .toList();
+ }
+
  @Transactional
  public void updateComment(
  final Long postId,
@@ -68,4 +81,5 @@ public void deleteComment(final Long postId, final Long commentId, final Member
 
  commentRepository.delete(comment);
  }
+
 }

backend/src/test/java/com/votogether/domain/post/service/PostCommentServiceTest.java

@@ -8,6 +8,7 @@
 import com.votogether.domain.member.repository.MemberRepository;
 import com.votogether.domain.post.dto.request.CommentRegisterRequest;
 import com.votogether.domain.post.dto.request.CommentUpdateRequest;
+import com.votogether.domain.post.dto.response.CommentResponse;
 import com.votogether.domain.post.entity.Post;
 import com.votogether.domain.post.entity.PostBody;
 import com.votogether.domain.post.entity.comment.Comment;
@@ -17,6 +18,7 @@
 import com.votogether.exception.NotFoundException;
 import com.votogether.fixtures.MemberFixtures;
 import java.time.LocalDateTime;
+import java.util.List;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -77,6 +79,56 @@ void createComment() {
 
  }
 
+ @Nested
+ @DisplayName("게시글 댓글 목록 조회")
+ class GetComments {
+
+ @Test
+ @DisplayName("존재하지 않는 게시글이라면 예외를 던진다.")
+ void emptyPost() {
+ // given, when, then
+ assertThatThrownBy(() -> postCommentService.getComments(-1L))
+ .isInstanceOf(NotFoundException.class)
+ .hasMessage("해당 게시글이 존재하지 않습니다.");
+ }
+
+ @Test
+ @DisplayName("게시글 댓글 목록을 조회한다.")
+ void getComments() {
+ // given
+ Member member = memberRepository.save(MemberFixtures.MALE_20.get());
+ Post post = postRepository.save(
+ Post.builder()
+ .writer(member)
+ .postBody(PostBody.builder().title("titleA").content("contentA").build())
+ .deadline(LocalDateTime.of(2100, 7, 12, 0, 0))
+ .build()
+ );
+ Comment commentA = commentRepository.save(
+ Comment.builder()
+ .member(member)
+ .post(post)
+ .content("commentA")
+ .build()
+ );
+ Comment commentB = commentRepository.save(
+ Comment.builder()
+ .member(member)
+ .post(post)
+ .content("commentB")
+ .build()
+ );
+
+ // when
+ List<CommentResponse> response = postCommentService.getComments(post.getId());
+
+ // then
+ assertThat(response).usingRecursiveComparison()
+ .isEqualTo(List.of(CommentResponse.from(commentA), CommentResponse.from(commentB)));
+ }
+
+ }
+
  @Nested
  @DisplayName("게시글 댓글 수정")
  class UpdateComment {