db={"users":[{_id:ObjectId("5f17dc2309ce612aa858b625"),"fullName":"Flix","email":"flixy121@gmail.com"},{_id:ObjectId("5f17dc2309ce612aa858b123"),"fullName":"Wakwaw","email":"flixy123@gmail.com"}],"posts":[{_id:ObjectId("3417dc3a09ce612aa858b627"),author:ObjectId("5f17dc2309ce612aa858b625"),"imageUrl":"http://localhost:8080/post/Flix-1705251483897.png","description":"Post 1"}],"comments":[{"_id":ObjectId("65a4131b395df50b87af7351"),"postId":ObjectId("3417dc3a09ce612aa858b627"),"comment":[{"user":ObjectId("5f17dc2309ce612aa858b625"),"value":"Gw comment nih"},{"user":ObjectId("5f17dc2309ce612aa858b625"),"value":"Eh ketinggalan comment ini"},{"user":ObjectId("5f17dc2309ce612aa858b123"),"value":"Comment gw nih 123"}]}]}

db.posts.aggregate([{"$match":{"_id":ObjectId("3417dc3a09ce612aa858b627")}},{"$lookup":{"from":"comments","localField":"_id","foreignField":"postId","as":"comments"}}])