[BE] fix: 본인 포함하여 조회하도록 쿼리 수정 (#94)

* [BE] fix: 본인 포함하여 조회하도록 쿼리 수정 (#94)
* [BE] fix: DirectMember Mapper build 누락 directId 추가 (#94)

Author: toychip

src/backend/guild-server/src/main/java/com/asyncgate/guild_server/repository/DirectMemberQueryDslRepository.java

@@ -16,14 +16,22 @@ public class DirectMemberQueryDslRepository {
     private final QDirectMemberEntity directMemberEntity = QDirectMemberEntity.directMemberEntity;
 
     public List<DirectMemberEntity> getDirectMessageList(final String currentUserId) {
-        return queryFactory
-                .select(directMemberEntity)
+        // Sub Query: 현재 사용자가 참여한 directId 목록
+        var subquery = queryFactory
+                .select(directMemberEntity.directId)
                 .from(directMemberEntity)
                 .where(
                         directMemberEntity.memberId.eq(currentUserId),
                         directMemberEntity.deleted.isFalse()
+                );
+
+        // Main Query: 위 directId에 속한 모든 DirectMember 조회
+        return queryFactory
+                .selectFrom(directMemberEntity)
+                .where(
+                        directMemberEntity.directId.in(subquery)
                 )
                 .fetch();
-
     }
+
 }

src/backend/guild-server/src/main/java/com/asyncgate/guild_server/support/utility/DomainUtil.java

@@ -119,6 +119,7 @@ public static DirectMemberEntity toEntity(final DirectMember directMember) {
         public static DirectMember toDomain(final DirectMemberEntity entity) {
             return DirectMember.builder()
                     .id(entity.getId())
+                    .directId(entity.getDirectId())
                     .memberId(entity.getMemberId())
                     .memberName(entity.getMemberName())
                     .createdDate(entity.getCreatedDate())