As the title says, I am trying to get specific data from the user when they are logged in and aggregate all the data and then return the aggregated data. I tried using the $match function but no luck. What's frustrating is that I'm able to successfully return all the data in the object array. More specifically, the following code runs successfully and returns an array of objects:

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

But this code doesn't, it returns an empty array:

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' },
      }
    }
  ])

I'm not sure why this is happening. What it should return is an array with an object populated with all the aggregated data in it.

I also know that if I remove $match it will successfully aggregate all the data in the running collection, so I think that has something to do with that.

Here are all the relevant codes:

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)
})