refactor: 한번에 모든 모임에 대한 참여와 찜 정보를 가져오도록 수정

backend/src/main/java/mouda/backend/moim/implement/finder/MoimFinder.java

@@ -1,8 +1,12 @@
 package mouda.backend.moim.implement.finder;
 
 import java.util.List;
+import java.util.Map;
 import java.util.function.Predicate;
 
+import mouda.backend.moim.infrastructure.dto.ChamyoCountResponse;
+import mouda.backend.moim.presentation.response.moim.MoimFindAllResponse;
+import mouda.backend.moim.presentation.response.moim.MoimFindAllResponses;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Component;
 
@@ -20,6 +24,8 @@
 import mouda.backend.moim.infrastructure.MoimRepository;
 import mouda.backend.moim.infrastructure.ZzimRepository;
 
+import static java.util.stream.Collectors.toMap;
+
 @Component
 @RequiredArgsConstructor
 public class MoimFinder {
@@ -28,19 +34,29 @@ public class MoimFinder {
 	private final ChamyoRepository chamyoRepository;
 	private final ZzimFinder zzimFinder;
 	private final ZzimRepository zzimRepository;
-	private final ChatRoomRepository chatRoomRepository;
-	private final ChatRoomFinder chatRoomFinder;
-	private final ChamyoFinder chamyoFinder;
 
 	public Moim read(long moimId, long currentDarakbangId) {
 		return moimRepository.findByIdAndDarakbangId(moimId, currentDarakbangId)
 			.orElseThrow(() -> new MoimException(HttpStatus.NOT_FOUND, MoimErrorMessage.NOT_FOUND));
 	}
 
 	public List<MoimOverview> readAll(long darakbangId, DarakbangMember darakbangMember) {
-		return moimRepository.findAllByDarakbangIdOrderByIdDesc(darakbangId).stream()
-			.map(moim -> createMoimOverview(moim, darakbangMember))
-			.toList();
+		List<Moim> moims = moimRepository.findAllByDarakbangIdOrderByIdDesc(darakbangId);
+		List<Long> moimIds = moims.stream()
+				.map(Moim::getId)
+				.toList();
+		Map<Long, Integer> counts = chamyoRepository.countByMoimIds(moimIds)
+				.stream()
+				.collect(toMap(ChamyoCountResponse::getMoimId, ChamyoCountResponse::getCount));
+		List<Long> zzims = zzimRepository.findZzimedMoimByMoimIdsAndDarakbangMemberId(moimIds, darakbangMember.getId());
+
+		return moims.stream()
+				.map(moim -> {
+					int currentPeople = counts.getOrDefault(moim.getId(), 0);
+					boolean isZzimed = zzims.contains(moim.getId());
+					return new MoimOverview(moim, currentPeople, isZzimed);
+				})
+				.toList();
 	}
 
 	public List<MoimOverview> readAllMyMoim(DarakbangMember darakbangMember, FilterType filterType) {

backend/src/main/java/mouda/backend/moim/infrastructure/ChamyoRepository.java

@@ -1,8 +1,10 @@
 package mouda.backend.moim.infrastructure;
 
+import java.util.Collection;
 import java.util.List;
 import java.util.Optional;
 
+import mouda.backend.moim.infrastructure.dto.ChamyoCountResponse;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
@@ -36,4 +38,8 @@ public interface ChamyoRepository extends JpaRepository<Chamyo, Long> {
 
 	@Query("SELECT c FROM Chamyo c WHERE c.moim.id = :moimId AND c.moimRole = 'MOIMER'")
 	Optional<Chamyo> findMoimerByMoimId(@Param("moimId") Long moimId);
+
+	@Query("SELECT new mouda.backend.moim.infrastructure.dto.ChamyoCountResponse(c.moim.id, COUNT(c))  FROM Chamyo c WHERE c.moim.id IN :moimIds GROUP BY c.moim.id")
+	List<ChamyoCountResponse> countByMoimIds(@Param("moimIds") List<Long> moimIds);
+
 }

backend/src/main/java/mouda/backend/moim/infrastructure/ZzimRepository.java

@@ -6,6 +6,7 @@
 import org.springframework.data.jpa.repository.JpaRepository;
 
 import mouda.backend.moim.domain.Zzim;
+import org.springframework.data.jpa.repository.Query;
 
 public interface ZzimRepository extends JpaRepository<Zzim, Long> {
 
@@ -14,4 +15,7 @@ public interface ZzimRepository extends JpaRepository<Zzim, Long> {
 	Optional<Zzim> findByMoimIdAndDarakbangMemberId(Long moimId, Long darakbangMemberId);
 
 	List<Zzim> findAllByDarakbangMemberIdOrderByIdDesc(Long darakbangMemberId);
+
+	@Query("SELECT z.moim.id FROM Zzim z WHERE z.darakbangMember.id = :darakbangMemberId AND z.moim.id IN :moimIds")
+	List<Long> findZzimedMoimByMoimIdsAndDarakbangMemberId(List<Long> moimIds, Long darakbangMemberId);
 }

backend/src/main/java/mouda/backend/moim/infrastructure/dto/ChamyoCountResponse.java

@@ -0,0 +1,15 @@
+package mouda.backend.moim.infrastructure.dto;
+
+import lombok.Getter;
+
+@Getter
+public class ChamyoCountResponse {
+
+    private final Long moimId;
+    private final Integer count;
+
+    public ChamyoCountResponse(Long moimId, Long count) {
+        this.moimId = moimId;
+        this.count = count.intValue();
+    }
+}