feat : 커뮤니티 쿼리 최적화 및 성능 테스트

src/main/java/org/ezcode/codetest/application/community/dto/response/DiscussionResponse.java

@@ -2,13 +2,18 @@
 
 import static io.swagger.v3.oas.annotations.media.Schema.RequiredMode.*;
 
+import java.time.LocalDateTime;
+
 import org.ezcode.codetest.application.usermanagement.user.dto.response.SimpleUserInfoResponse;
+import org.ezcode.codetest.domain.community.dto.DiscussionQueryResult;
 import org.ezcode.codetest.domain.community.model.entity.Discussion;
+import org.ezcode.codetest.domain.community.model.enums.VoteType;
 
 import io.swagger.v3.oas.annotations.media.Schema;
 
-@Schema(name = "DiscussionResponse", description = "Discussion 조회 응답 DTO")
+@Schema(name = "DiscussionResponse", description = "Discussion 응답 DTO, 목록 조회 시에만 추천 수, 비추천 수 등의 데이터가 포함됨")
 public record DiscussionResponse(
+
 	@Schema(description = "Discussion 고유 ID", example = "123", requiredMode = REQUIRED)
 	Long discussionId,
 
@@ -18,20 +23,51 @@ public record DiscussionResponse(
 	@Schema(description = "관련 문제 ID", example = "45", requiredMode = REQUIRED)
 	Long problemId,
 
-	@Schema(description = "사용 언어명", example = "Java 17", requiredMode = REQUIRED)
-	String languages,
-
 	@Schema(description = "토론 내용", example = "이 문제는 이렇게 풀 수 있습니다...", requiredMode = REQUIRED)
-	String content
+	String content,
+
+	@Schema(description = "생성 일시", example = "2025-06-25T14:30:00", requiredMode = REQUIRED)
+	LocalDateTime createdAt,
+
+	@Schema(description = "총 추천 수 (upvote)", example = "10")
+	Long upvoteCount,
+
+	@Schema(description = "총 비추천 수 (downvote)", example = "2")
+	Long downvoteCount,
+
+	@Schema(description = "총 댓글 수", example = "5")
+	Long replyCount,
+
+	@Schema(description = "현재 사용자의 추천 상태 (UP, DOWN, NONE)", example = "UP")
+	VoteType voteStatus
+
 ) {
 
 	public static DiscussionResponse fromEntity(Discussion discussion) {
 		return new DiscussionResponse(
 			discussion.getId(),
 			SimpleUserInfoResponse.fromEntity(discussion.getUser()),
-			discussion.getProblem().getId(),	// 문제 id가 굳이 필요한가?
-			discussion.getLanguage().getName(),	// TODO: 가공해줘야 할듯?
-			discussion.getContent()
+			discussion.getProblem().getId(),
+			discussion.getContent(),
+			discussion.getCreatedAt(),
+			null,
+			null,
+			null,
+			null
+		);
+	}
+
+	public static DiscussionResponse from(DiscussionQueryResult result) {
+		return new DiscussionResponse(
+			result.getDiscussionId(),
+			result.getUserInfo(),
+			result.getProblemId(),
+			result.getContent(),
+			result.getCreatedAt(),
+			result.getUpvoteCount(),
+			result.getDownvoteCount(),
+			result.getReplyCount(),
+			result.getVoteStatus()
 		);
 	}
 }

src/main/java/org/ezcode/codetest/application/community/dto/response/ReplyResponse.java

@@ -2,18 +2,23 @@
 
 import static io.swagger.v3.oas.annotations.media.Schema.RequiredMode.*;
 
+import java.time.LocalDateTime;
+
 import org.ezcode.codetest.application.usermanagement.user.dto.response.SimpleUserInfoResponse;
+import org.ezcode.codetest.domain.community.dto.ReplyQueryResult;
 import org.ezcode.codetest.domain.community.model.entity.Reply;
+import org.ezcode.codetest.domain.community.model.enums.VoteType;
 
 import io.swagger.v3.oas.annotations.media.Schema;
 
 @Schema(name = "ReplyResponse", description = "Reply 조회 응답 DTO")
 public record ReplyResponse(
+
 	@Schema(description = "Reply 고유 ID", example = "456", requiredMode = REQUIRED)
 	Long replyId,
 
 	@Schema(description = "부모 Reply ID (없으면 null)", example = "123", nullable = true, requiredMode = NOT_REQUIRED)
-	Long parentId,
+	Long parentReplyId,
 
 	@Schema(description = "소속 Discussion ID", example = "123", requiredMode = REQUIRED)
 	Long discussionId,
@@ -22,19 +27,58 @@ public record ReplyResponse(
 	SimpleUserInfoResponse userInfo,
 
 	@Schema(description = "댓글 내용", example = "동의합니다!", requiredMode = REQUIRED)
-	String content
+	String content,
+
+	@Schema(description = "생성 일시", example = "2025-06-25T14:30:00", requiredMode = REQUIRED)
+	LocalDateTime createdAt,
+
+	@Schema(description = "총 추천 수 (upvote)", example = "10")
+	Long upvoteCount,
+
+	@Schema(description = "총 비추천 수 (downvote)", example = "2")
+	Long downvoteCount,
+
+	@Schema(description = "총 댓글 수", example = "5")
+	Long childReplyCount,
+
+	@Schema(description = "현재 사용자의 추천 상태 (UP, DOWN, NONE)", example = "UP")
+	VoteType voteStatus
+
 ) {
 
 	public static ReplyResponse fromEntity(Reply reply) {
+
 		Long parentId = (reply.getParent() != null)
 			? reply.getParent().getId()
 			: null;
+
 		return new ReplyResponse(
 			reply.getId(),
 			parentId,
 			reply.getDiscussion().getId(),
 			SimpleUserInfoResponse.fromEntity(reply.getUser()),
-			reply.getContent()
+			reply.getContent(),
+			reply.getCreatedAt(),
+			null,
+			null,
+			null,
+			null
+		);
+	}
+
+	public static ReplyResponse from(ReplyQueryResult result) {
+
+		return new ReplyResponse(
+			result.getReplyId(),
+			result.getParentReplyId(),
+			result.getDiscussionId(),
+			result.getUserInfo(),
+			result.getContent(),
+			result.getCreatedAt(),
+			result.getUpvoteCount(),
+			result.getDownvoteCount(),
+			result.getChildReplyCount(),
+			result.getVoteStatus()
 		);
 	}
 }

src/main/java/org/ezcode/codetest/application/community/dto/response/VoteResponse.java

@@ -2,7 +2,7 @@
 
 import static io.swagger.v3.oas.annotations.media.Schema.RequiredMode.*;
 
-import org.ezcode.codetest.domain.community.model.VoteResult;
+import org.ezcode.codetest.domain.community.dto.VoteResult;
 import org.ezcode.codetest.domain.community.model.enums.VoteType;
 
 import io.swagger.v3.oas.annotations.media.Schema;

src/main/java/org/ezcode/codetest/application/community/service/BaseVoteService.java

@@ -1,7 +1,7 @@
 package org.ezcode.codetest.application.community.service;
 
 import org.ezcode.codetest.application.community.dto.response.VoteResponse;
-import org.ezcode.codetest.domain.community.model.VoteResult;
+import org.ezcode.codetest.domain.community.dto.VoteResult;
 import org.ezcode.codetest.domain.community.model.entity.BaseVote;
 import org.ezcode.codetest.domain.community.model.enums.VoteType;
 import org.ezcode.codetest.domain.community.service.BaseVoteDomainService;

src/main/java/org/ezcode/codetest/application/community/service/DiscussionService.java

@@ -3,6 +3,7 @@
 import org.ezcode.codetest.application.community.dto.request.DiscussionCreateRequest;
 import org.ezcode.codetest.application.community.dto.request.DiscussionModifyRequest;
 import org.ezcode.codetest.application.community.dto.response.DiscussionResponse;
+import org.ezcode.codetest.domain.community.dto.DiscussionQueryResult;
 import org.ezcode.codetest.domain.community.model.entity.Discussion;
 import org.ezcode.codetest.domain.community.service.DiscussionDomainService;
 import org.ezcode.codetest.domain.language.model.entity.Language;
@@ -40,10 +41,11 @@ public DiscussionResponse createDiscussion(Long problemId, DiscussionCreateReque
 	}
 
 	@Transactional(readOnly = true)
-	public Page<DiscussionResponse> getDiscussions(Long problemId, Pageable pageable) {
+	public Page<DiscussionResponse> getDiscussions(Long problemId, String sortBy, Long userId, Pageable pageable) {
 
-		Page<Discussion> discussionResponsePage = discussionDomainService.getAllDiscussionsByProblemId(problemId, pageable);
-		return discussionResponsePage.map(DiscussionResponse::fromEntity);
+		Page<DiscussionQueryResult> result =
+			discussionDomainService.getAllDiscussionsByProblemId(problemId, sortBy, userId, pageable);
+		return result.map(DiscussionResponse::from);
 	}
 
 	@Transactional

src/main/java/org/ezcode/codetest/application/community/service/ReplyService.java

@@ -7,6 +7,7 @@
 import org.ezcode.codetest.application.community.dto.response.ReplyResponse;
 import org.ezcode.codetest.application.notification.event.NotificationCreateEvent;
 import org.ezcode.codetest.application.notification.port.NotificationEventService;
+import org.ezcode.codetest.domain.community.dto.ReplyQueryResult;
 import org.ezcode.codetest.domain.community.model.entity.Discussion;
 import org.ezcode.codetest.domain.community.model.entity.Reply;
 import org.ezcode.codetest.domain.community.service.DiscussionDomainService;
@@ -58,28 +59,30 @@ public ReplyResponse createReply(
 	}
 
 	@Transactional(readOnly = true)
-	public Page<ReplyResponse> getReplies(Long problemId, Long discussionId, Pageable pageable) {
+	public Page<ReplyResponse> getReplies(Long problemId, Long discussionId, Long currentUserId, Pageable pageable) {
 
 		Discussion discussion = discussionDomainService.getDiscussionForProblem(discussionId, problemId);
 
-		Page<Reply> replies = replyDomainService.getRepliesByDiscussionId(discussion, pageable);
+		Page<ReplyQueryResult> replies = replyDomainService.getRepliesByDiscussionId(discussion, currentUserId, pageable);
 
-		return replies.map(ReplyResponse::fromEntity);
+		return replies.map(ReplyResponse::from);
 	}
 
 	@Transactional(readOnly = true)
 	public Page<ReplyResponse> getChildReplies(
 		Long problemId,
 		Long discussionId,
 		Long parentReplyId,
+		Long currentUserId,
 		Pageable pageable
 	) {
 
 		Discussion discussion = discussionDomainService.getDiscussionForProblem(discussionId, problemId);
 
-		Page<Reply> replies = replyDomainService.getRepliesByParentReplyId(parentReplyId, discussion, pageable);
+		Page<ReplyQueryResult> childReplies =
+			replyDomainService.getRepliesByParentReplyId(parentReplyId, discussion, currentUserId, pageable);
 
-		return replies.map(ReplyResponse::fromEntity);
+		return childReplies.map(ReplyResponse::from);
 	}
 
 	@Transactional

src/main/java/org/ezcode/codetest/domain/community/dto/DiscussionQueryResult.java

@@ -0,0 +1,63 @@
+package org.ezcode.codetest.domain.community.dto;
+
+import java.time.LocalDateTime;
+
+import org.ezcode.codetest.application.usermanagement.user.dto.response.SimpleUserInfoResponse;
+import org.ezcode.codetest.domain.community.model.enums.VoteType;
+
+import com.querydsl.core.annotations.QueryProjection;
+
+import lombok.Getter;
+
+@Getter
+public class DiscussionQueryResult {
+
+	private final Long discussionId;
+
+	private final SimpleUserInfoResponse userInfo;
+
+	private final Long problemId;
+
+	private final String content;
+
+	private final LocalDateTime createdAt;
+
+	private final Long upvoteCount;
+
+	private final Long downvoteCount;
+
+	private final Long replyCount;
+
+	private final VoteType voteStatus;
+
+	@QueryProjection
+	public DiscussionQueryResult(
+		Long discussionId,
+		SimpleUserInfoResponse userInfo,
+		Long problemId,
+		String content,
+		LocalDateTime createdAt,
+		Long upvoteCount,
+		Long downvoteCount,
+		Long replyCount,
+		VoteType voteType
+	) {
+
+		this.discussionId = discussionId;
+		this.userInfo = userInfo;
+		this.problemId = problemId;
+		this.content = content;
+		this.createdAt = createdAt;
+		this.upvoteCount = upvoteCount;
+		this.downvoteCount = downvoteCount;
+		this.replyCount = replyCount;
+
+		if (voteType == null) {
+			this.voteStatus = VoteType.NONE;
+		} else if (voteType == VoteType.UP) {
+			this.voteStatus = VoteType.UP;
+		} else {
+			this.voteStatus = VoteType.DOWN;
+		}
+	}
+}

src/main/java/org/ezcode/codetest/domain/community/dto/ReplyQueryResult.java

@@ -0,0 +1,67 @@
+package org.ezcode.codetest.domain.community.dto;
+
+import java.time.LocalDateTime;
+
+import org.ezcode.codetest.application.usermanagement.user.dto.response.SimpleUserInfoResponse;
+import org.ezcode.codetest.domain.community.model.enums.VoteType;
+
+import com.querydsl.core.annotations.QueryProjection;
+
+import lombok.Getter;
+
+@Getter
+public class ReplyQueryResult {
+
+	private final Long replyId;
+
+	private final SimpleUserInfoResponse userInfo;
+
+	private final Long parentReplyId;
+
+	private final Long discussionId;
+
+	private final String content;
+
+	private final LocalDateTime createdAt;
+
+	private final Long upvoteCount;
+
+	private final Long downvoteCount;
+
+	private final Long childReplyCount;
+
+	private final VoteType voteStatus;
+
+	@QueryProjection
+	public ReplyQueryResult(
+		Long replyId,
+		SimpleUserInfoResponse userInfo,
+		Long parentReplyId,
+		Long discussionId,
+		String content,
+		LocalDateTime createdAt,
+		Long upvoteCount,
+		Long downvoteCount,
+		Long childReplyCount,
+		VoteType voteType
+	) {
+
+		this.replyId = replyId;
+		this.userInfo = userInfo;
+		this.parentReplyId = parentReplyId;
+		this.discussionId = discussionId;
+		this.content = content;
+		this.createdAt = createdAt;
+		this.upvoteCount = upvoteCount;
+		this.downvoteCount = downvoteCount;
+		this.childReplyCount = childReplyCount;
+
+		if (voteType == null) {
+			this.voteStatus = VoteType.NONE;
+		} else if (voteType == VoteType.UP) {
+			this.voteStatus = VoteType.UP;
+		} else {
+			this.voteStatus = VoteType.DOWN;
+		}
+	}
+}

src/main/java/org/ezcode/codetest/domain/community/model/VoteResult.java → src/main/java/org/ezcode/codetest/domain/community/dto/VoteResult.java

@@ -1,4 +1,4 @@
-package org.ezcode.codetest.domain.community.model;
+package org.ezcode.codetest.domain.community.dto;
 
 import org.ezcode.codetest.domain.community.model.enums.VoteType;