How search in subdocument (MongoDB)

Hi, i try use Mongo. Why result is not wrapped into array? I want get current record for login. Thanks.

        Structure:

        { 
                    "_id" : ObjectId("540822d55d34c4087a320064"), 
                    "user" : { 
                                "login" : "one", 
                                "password" : "$2y$10$RB2PvyRWxD7kdZcYpb8BGO6E/2ftbAEwnJ/28TBWUaDmX.iesPqY2", 
                                "role" : "user" 
                    } 
        }

        Code:

        $cursor = LoginModel::find(array(
            "user.login" => $login
        ));

        foreach($cursor as $doc){ // query
            foreach($doc as $s){
                echo "<pre>";
                var_dump($s);
                echo "</pre>";
            }
        }

        Result:

        object(MongoId)#84 (1) {
          ["$id"]=>
          string(24) "540822d55d34c4087a320064"
        }

        array(3) {
          ["login"]=>
          string(3) "one"
          ["password"]=>
          string(60) "$2y$10$RB2PvyRWxD7kdZcYpb8BGO6E/2ftbAEwnJ/28TBWUaDmX.iesPqY2"
          ["role"]=>
          string(4) "user"
        }