db={"friendRequests":[{"_id":{"$oid":"63764d512bf0d70cbce32664"},"author":{"$oid":"636fa1ce289c56d125ac8a4a"},"friend_id":{"$oid":"636a88de3e45346191cf4257"},"request_at":{"$date":{"$numberLong":"1668697425541"}},"__v":0},{"_id":{"$oid":"63764d622bf0d70cbce32673"},"author":{"$oid":"636cf37d8a8b51a38932d3d8"},"friend_id":{"$oid":"636a88de3e45346191cf4257"},"request_at":{"$date":{"$numberLong":"1668697442809"}},"__v":0},{"_id":{"$oid":"637cc8e760709f87c46ad5a9"},"author":{"$oid":"636a88de3e45346191cf4257"},"friend_id":{"$oid":"636faabb1861c5b8773f751e"},"request_at":{"$date":{"$numberLong":"1669122279674"}},"__v":0}]}

db.friendRequests.find({$and:[{author:ObjectId("636a88de3e45346191cf4257")},{friend_id:ObjectId("636faabb1861c5b8773f751e")}]})