Merge pull request #217 from TeamPiickle/sprint/4th

Sprint/4th

Author: DongLee99

src/services/cardService.ts

@@ -123,11 +123,6 @@ const findRecentlyUpdatedCard = async (userId?: Types.ObjectId) => {
 
 const findRecentlyBookmarkedCard = async (userId?: Types.ObjectId) => {
   const bookmarks: BookmarkDocument[] = await Bookmark.aggregate()
-    .group({
-      _id: '$card',
-      card: { $first: '$card' },
-      createdAt: { $first: '$createdAt' }
-    })
     .sort({ createdAt: -1 })
     .limit(20);
   const cards: CardDocument[] = (