Database
db={"userprofile":[{"_id":ObjectId("60650e6fc4b4603e1e78bb23"),"firstName":"Luthfan","lastName":"Difiesa","mobile":"86742633497","gender":"male"}],"user-wishlist":[{"_id":ObjectId("60650e7a1a4a817a1dd0a29c"),"userId":"86742633497","contents":[{"_id":ObjectId("5ef9d2da228f840bbd41649c"),"name":"Kelas 11"}]}]}
Query
db.userprofile.aggregate([{"$lookup":{"from":"user-wishlist","localField":"mobile","foreignField":"userId","as":"contents"}}])