mongodb中$or和upsert兼容问题

Question

今天碰到一个问题，当我在update数据的时候想使用upsert功能，发现插入的数据并没有过滤条件中$or的部分，如下：

db.msg.update(
    {
        “type”: “u”,
        “$or”: [
            {“from”: 1, “to”: 2},
            {“from”: 2, “to”: 1}
        ]
    },
    {
        “$push”: {
            “message”: {
                “data”: “holla”,
                “status”: false,
                “time”: new Date()
            }
        }
    },
    true,
    true
);

本来希望的是：如果发现msg集合中如果没有对应文档，则插入，例如上面的这条更新（假设当前集合中不存在from:1,to:2的这个文档），执行完后msg集合中应当出现下面这个文档：

{
    "from": 1,
    "to": 2,
    "type": "u",
    "message": [
        {
            “data”: “holla”,
            “status”: false,
            “time”: ISODate("2014-02-12T01:50:40.866Z")
        }
    ]
}

可实际情况是插入的数据中并不会包含$or部分的条件，请问有没有解决方案？

Answer 1

$upsert currently (2.4) does not support $and and $or, but it is said that 2.6 supports it. See official issues:

• $or paired with upsert does not create documents for each or clause
• Insert from update (w/upsert:true) ignores $and equality fields

Answer 2

upsert This method is inherently unreliable, and it is clearly written in the manual

Warning: To avoid inserting the same document more than once, only use upsert: true if the query field is uniquely indexed.

So you ignored me?