Question

当我尝试在聚合管道中使用Error: Arguments must be aggregate pipeline operators时，我收到错误allowDiskUse。我遵循Mongodb网站的结构但仍然失败，为什么？

coin.aggregate([
        {
            $match: {
                exchange: exchange
            }
        },
        {
            $unwind: "$coin_sum"
        },
        {
            // match query with array (here is no longer array)
            $match: {
                $or: [
                    { "coin_sum.granularity": "minute", "coin_sum.timeStamp": { $lt: (expiration.minute) ? parseInt(timeStamp) - expiration.minute : 0 } },
                    { "coin_sum.granularity": "hour", "coin_sum.timeStamp": { $lt: (expiration.hour) ? parseInt(timeStamp) - expiration.hour : 0 } },
                    { "coin_sum.granularity": "day", "coin_sum.timeStamp": { $lt: (expiration.day) ? parseInt(timeStamp) - expiration.day : 0 } },
                    { "coin_sum.granularity": "month", "coin_sum.timeStamp": { $lt: (expiration.month) ? parseInt(timeStamp) - expiration.month : 0 } }
                ]
            }
        },
        {
            $group: {
                _id: "$exchange",
                remove_coins: {
                    $addToSet: {
                        high: "$coin_sum.high",
                        low: "$coin_sum.low"
                    }
                }
            }
        }
    ], 
    { 
        allowDiskUse: true, 
        cursor: { 
            batchSize: 1000 
        }
    }).then((res) => {
        console.log(res);
    });

Answer 1

我想通了

nouveautes.forEach(function(nouveaute) {
  console.log(nouveaute.createdAt.toLocaleString());
  nouveaute.createdAt = nouveaute.createdAt.toLocaleString();
  console.log(nouveaute.createdAt.getMonth());
  nouveaute.createdAt = nouveaute.createdAt.getMonth() + " " + nouveaute.createdAt.getYear();
  console.log(nouveaute.createdAt);
});

Answer 2

coin.aggregate(
        { "$facet": {
            {
                $match: {
                    exchange: exchange
                }
            },
            {
                $unwind: "$coin_sum"
            },
            {
                $match: {
                    $or: [
                        { "coin_sum.granularity": "minute", "coin_sum.timeStamp": 
                        { $lt: (expiration.minute) ? parseInt(timeStamp) - 
                          expiration.minute : 0 } },
                        { "coin_sum.granularity": "hour", "coin_sum.timeStamp": { 
                           $lt: (expiration.hour) ? parseInt(timeStamp) - 
                            expiration.hour : 0 } },
                        { "coin_sum.granularity": "day", "coin_sum.timeStamp": { 
                           $lt: (expiration.day) ? parseInt(timeStamp) - 
                            expiration.day : 0 } },
                        { "coin_sum.granularity": "month", "coin_sum.timeStamp": { 
                           $lt: (expiration.month) ? parseInt(timeStamp) - 
                           expiration.month : 0 } }
                    ]
                }
            },
            {
                $group: {
                    _id: "$exchange",
                    remove_timeStamp: {
                        $addToSet: "$coin_sum.timeStamp"
                    },
                    remove_granularity: {
                        $addToSet: "$coin_sum.granularity"
                    }
                }
            }
        }
        ).allowDiskUse(true).cursor({batchSize : 1000})
            .then((res) => { //do something });

参数必须是聚合管道运算符

2 个答案: