[{_id:ObjectId("6570d8aef19ec1c690cc8d34"),name:"party",items:[{name:"Welcome to your todo list",_id:ObjectId("6570d8aaf19ec1c690cc8d31")},{name:"Hit the + button to add a new item.",_id:ObjectId("6570d8aaf19ec1c690cc8d32")},{name:"Hit this to delete an item.",_id:ObjectId("6570d8aaf19ec1c690cc8d33")},{name:"heya",_id:ObjectId("6570ee634c6ed501ba04974a")},{name:"hoiya",_id:ObjectId("6570eea34c6ed501ba049778")},{name:"heyty",_id:ObjectId("6570ef6d934fb47039850682")},{name:"dsfdsf",_id:ObjectId("6570efcad07077740a80ce5a")},{name:"hey",_id:ObjectId("6570f193c6b50f3c3d692951")},{name:"hiii",_id:ObjectId("6570f1bcc6b50f3c3d69299b")}]}]

db.collection.update({"items._id":ObjectId("6570d8aaf19ec1c690cc8d33")},{$pull:{"items":{_id:ObjectId("6570d8aaf19ec1c690cc8d33")}}})