Find the difference in weeks between two dates using MongoDB aggregate

Question

Find the difference in weeks between two dates using MongoDB aggregate

My current dilemma involves extracting student data for each week within an academic year based on a start date and end date. To achieve this, I have devised an array that contains the start and end dates for every week. The process involves iterating through each week, querying the database in a loop like so:

let allWeeksData = []

  let groupQuery: any = {
    _id: {
      attendance_code: "$attendance_code",
    },
    total: { $sum: 1 },
  };

for(let dateRanges of dateRangesArray)
{
  const startDate = dateRanges.start_date;
  const endDate = dateRanges.end_date;

  const rawResults = await sessionAttendanceModel.aggregate([
    {
      $match: {
        student_school: { $in: studentSchoolIDs },
        "date.date": {
          $gte: new Date(startDate),
          $lte: new Date(endDate),
        },
        attendance_code: {
          $in: usedAttendanceCodes,
        },
      },
    },
    {
      $group: groupQuery,
    },
  ]);
  rawResults.start_date = startDate
  rawResults.end_date = endDate
  allWeeksData.push(rawResults)
}

However, this method has proven to be inefficiently slow. Is there a more streamlined approach to execute a single aggregate group query on the database and achieve the same outcome?

javascript mongodb aggregate

Answer 1

Answer №1

If you need to extract the week of the year from a date in MongoDB, you can utilize the $week operator. By incorporating a $group stage, you can easily group your data based on the weeks of the year:

{
  $group: {
    _id: {
      "week": {
        $week: "$date"
      },
      "year": {
        $year: "$date"
      }
    }
  }
}

Explore this concept further with the help of the Mongo playground

Answer 2

If you need to extract the week of the year from a date in MongoDB, you can utilize the $week operator. By incorporating a $group stage, you can easily group your data based on the weeks of the year:

{
  $group: {
    _id: {
      "week": {
        $week: "$date"
      },
      "year": {
        $year: "$date"
      }
    }
  }
}

Explore this concept further with the help of the Mongo playground

Answer 3

Answer №2

Consider organizing the data like this:

{
   _id: {
      event_type: "$event_type",
      time: {
         $dateTrunc: {
            timestamp: "$timestamp.timestamp",
            unit: "hour",
            startOfHour: "midnight"
         }
      },
   },
   count: { $sum: 1 },
}

Answer 4

Consider organizing the data like this:

{
   _id: {
      event_type: "$event_type",
      time: {
         $dateTrunc: {
            timestamp: "$timestamp.timestamp",
            unit: "hour",
            startOfHour: "midnight"
         }
      },
   },
   count: { $sum: 1 },
}

Answer 5

Answer №3

If you want to organize your data by weeks, you can use the $group function and then customize the exit values in the $project pipeline to fit your specific requirements.

Your aggregation operation should look something like this:

[{
    $group:{
        _id:{
            $week: "$date.date"
        },
        data:{
            $first: "$$ROOT"
        }
    }
}]

Answer 6

If you want to organize your data by weeks, you can use the $group function and then customize the exit values in the $project pipeline to fit your specific requirements.

Your aggregation operation should look something like this:

[{
    $group:{
        _id:{
            $week: "$date.date"
        },
        data:{
            $first: "$$ROOT"
        }
    }
}]

Find the difference in weeks between two dates using MongoDB aggregate

Answer №1

Answer №2

Answer №3

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