TypeError：callback.apply不是allowDiskUse之后的函数

问题描述

我有一个包含一百万个文档的集合...我已经通过了 allowDiskUse 的选项，现在它抛出错误

I have a collection having 1Million documents... I have passed the option for allowDiskUse and now it is throwing error

TypeError：callback.apply不是函数

我已经搜索过了，但是可以得到解决方案...请帮助

I have searched for this but could get the solution... Please help

const pictures = await Picture.aggregate([
      { $sort: { createdAt: -1 }},
      { $group: {
        _id: { $dateToString: { format: "%Y-%m-%d", date: "$createdAt" } },
        pictures: {
          $push: {
            _id: '$_id',
            image: '$image',
            time: { $dateToString: { format: "%H:%M:%S", date: "$createdAt" } }
          }
        }
      }},
      { $limit: 50 },
      { $project: {
        _id: false,
        createdAt: '$_id',
        pictures: '$pictures'
      }}
    ], { allowDiskUse: true })

Mongodb版本- 3.6

Mongodb version - 3.6

猫鼬版本-5.0

推荐答案

因为这是猫鼬。在 aggregate（）方法。这是源链接，然后是。请注意，返回的类型。

Because this is "mongoose". There is no "options" block on the aggregate() method in the Mongoose API. That's the source link and then the documentation. Note the returned <Aggregate> type.

链接到如文档所示：

That chains to allowDiskUse(true) as demonstrated in the documentation:

await Model.aggregate(..).allowDiskUse(true).exec()

您实际上，绝不需要在大多数聚合中使用该选项。收到警告消息通常表明您实际上缺少索引，或者实际上是对并过滤结果。

You should really never need to use the option in most aggregations. Getting a warning message is usually an indicator that you are actually missing an index, or indeed any sane attempt to $match and filter down results.

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