当用户登录时返回特定用户的总值

正如标题所说，我试图在用户登录时从他们那里获取特定数据并汇总所有数据，然后返回该汇总数据。我试过使用

$match

const runs = await Run.find({ user: req.user.id })

但是这段代码没有，它返回一个空数组：

const cumulativeTotals = await Run.aggregate([
    { $match: { user: req.user.id } },
    {
      $group: {
        _id: null,
        totalRunTime: { $sum: '$runTime' },
        avgRunTime: { $avg: '$runTime' },
        totalRunDistance: { $sum: '$runDistance' },
        avgRunDistance: { $avg: '$runDistance' },
        avgPace: { $avg: '$avgPace' },
        totalHeartRate: { $avg: '$avgHeartRate' },
        totalActiveCalories: { $sum: '$activeCalories' },
        averageActiveCalories: { $avg: '$activeCalories' },
        absoluteTotalCalories: { $sum: '$totalCalories' },
        avgTotalCalories: { $avg: '$totalCalories' },
      }
    }
  ])

我不确定为什么会这样。它应该返回的是一个数组，其中包含一个对象，该对象填充了其中的所有聚合数据。

我也知道，如果我删除

$match

以下是所有相关代码：

const getRuns = asyncHandler(async (req, res) => {
  const runs = await Run.find({ user: req.user.id })

  const cumulativeTotals = await Run.aggregate([
    { $match: { user: req.user.id } },
    {
      $group: {
        _id: null,
        totalRunTime: { $sum: '$runTime' },
        avgRunTime: { $avg: '$runTime' },
        totalRunDistance: { $sum: '$runDistance' },
        avgRunDistance: { $avg: '$runDistance' },
        avgPace: { $avg: '$avgPace' },
        totalHeartRate: { $avg: '$avgHeartRate' },
        totalActiveCalories: { $sum: '$activeCalories' },
        averageActiveCalories: { $avg: '$activeCalories' },
        absoluteTotalCalories: { $sum: '$totalCalories' },
        avgTotalCalories: { $avg: '$totalCalories' },
      }
    }
  ])


  if (!runs) {
    res.status(400).json({ message: 'No Runs Found for This User' })
    return
  }

  const response = {
    runs,
    cumulativeTotals
  }

  res.status(200).json(response)
})