{
  "_id" : ObjectId("52fb2ceb1e2f8622d4228a7a"),
  "from" : 0,
  "message" : [{
      "data" : "test1",
      "status" : true,
      "time" : 1
    }, {
      "data" : "test2",
      "status" : true,
      "time" : 2
    }],
  "to" : 1,
  "type" : "s"
}

如何用一条命令把message数组中2个对象元素中的status属性都改成false？

是否只能在客户端做逻辑处理：

var cursor =  db.msg.find({“to”: uid, “message.status”: false});
while(cursor.hasNext()){  //由于默认情况下find取得的游标已经做过快照，所以理论上不会影响在find之后新增的数据
    var doc = cursor.next();
    var from = doc.from;
    var type = doc.type;
        //循环对应文档的message数组中的所有元素，进行逐行更改
    item.message.foreach(function(msg){
         db.msg.update({
                “to”: uid,
                “from”: from,
                “type”: type,
                “message.time”: msg.time
            },
            {
                “$set”: {
                        “message.$.status”: true    
                    }
                }
            );
        });
}

请大家指正~~