Another problem working with mongoose. I want to update `task` in document as example below. 
For example I want to update `completed` field in task with `_id=1` in `project` with `name` inbox.
Is it possible to do in one query?

```
{
    "_id" : ObjectId("5702e0c732faf57c7bb9ebe9"),
    "email" : "john@doe.me",
    "projects" : [ 
        {
            "_id" : "1",
            "name" : "inbox",
            "tasks" : [ 
                {
                    "_id" : "1",
                    "text" : "First task",
                    "labels" : [ 
                        "home", 
                        "phone"
                    ],
                    "dueDate" : "2016-03-18T11:10:00",
                    "created" : "2016-03-10T10:10:00",
                    "completed" : true
                }, 
                {
                    "_id" : "2",
                    "text" : "Second task",
                    "labels" : [ 
                        "home", 
                        "phone"
                    ],
                    "dueDate" : "2016-03-18T11:10:00",
                    "created" : "2016-03-10T10:10:00",
                    "completed" : false
                }, 
            ]
        }, 
        {
            "_id" : "2",
            "name" : "work",
            "tasks" : [ 
                {
                    "_id" : "4",
                    "text" : "Fourth",
                    "labels" : [ 
                        "home", 
                        "phone"
                    ],
                    "dueDate" : "2016-03-18T11:10:00",
                    "created" : "2016-03-10T10:10:00",
                    "completed" : false
                }
            ]
        }
    ]
}

```