feat: 공유 그룹의 대표 이미지를 초기화하는 로직 추가

src/main/java/com/umc/naoman/domain/photo/elasticsearch/service/PhotoEsServiceImpl.java

@@ -3,13 +3,16 @@
 import com.umc.naoman.domain.member.entity.Member;
 import com.umc.naoman.domain.photo.elasticsearch.document.PhotoEs;
 import com.umc.naoman.domain.photo.elasticsearch.repository.PhotoEsClientRepository;
+import com.umc.naoman.domain.shareGroup.entity.ShareGroup;
 import com.umc.naoman.domain.shareGroup.service.ShareGroupService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.stream.Collectors;
+
 @Service
 @RequiredArgsConstructor
 public class PhotoEsServiceImpl implements PhotoEsService {
@@ -29,7 +32,17 @@ public Page<PhotoEs> getPhotoEsListByShareGroupIdAndFaceTag(Long shareGroupId, L
     @Transactional(readOnly = true)
     public Page<PhotoEs> getAllPhotoEsListByShareGroupId(Long shareGroupId, Member member, Pageable pageable) {
         validateShareGroupAndProfile(shareGroupId, member);
-        return photoEsClientRepository.findPhotoEsByShareGroupId(shareGroupId, pageable);
+        Page<PhotoEs> photoEsList = photoEsClientRepository.findPhotoEsByShareGroupId(shareGroupId, pageable);
+
+        final ShareGroup shareGroup = shareGroupService.findShareGroup(shareGroupId);
+        if (shareGroup.getImage() == null) {
+            photoEsList.stream()
+                    .filter(photoEs -> photoEs.getFaceTag().size() >= shareGroup.getMemberCount())
+                    .findFirst()
+                    .ifPresent(photoEs -> shareGroup.updateImage(photoEs.getUrl()));
+        }
+
+        return photoEsList;
     }
 
     @Override

src/main/java/com/umc/naoman/domain/shareGroup/entity/ShareGroup.java

@@ -53,4 +53,8 @@ public void delete() {
         }
         super.delete();
     }
+
+    public void updateImage(String image) {
+        this.image = image;
+    }
 }