mongoose Date comparing without time and Group by createdAt and staffId with Weekly, monthly and Yearly total of staff count by aggregation?

问题

Might be question is look like duplicate but apologize for it.

I want to aggregate the weekly, Monthly, Yearly result basis of createdAt property without time and staffId.

Model is like below:

   {
    "_id" : ObjectId("5f351f3d9d90b1281c44c5dp"),
    "staffId" : 12345,
    "category" : "trend",
    "page_route" : "http://example.com/rer",
    "expireAt" : ISODate("2020-08-13T11:08:45.196Z"),
    "createdAt" : ISODate("2020-08-13T11:08:45.199Z"),
    "updatedAt" : ISODate("2020-08-13T11:08:45.199Z"),
    "__v" : 0
}
{
    "_id" : ObjectId("5f351f3d9d90b1281c44c5de"),
    "staffId" : 12346,
    "category" : "incident",
    "page_route" : "http://example.com/rergfhfhf",
    "expireAt" : ISODate("2020-08-14T11:08:45.196Z"),
    "createdAt" : ISODate("2020-08-08T11:08:45.199Z"),
    "updatedAt" : ISODate("2020-08-12T11:08:45.199Z"),
    "__v" : 0
}
{
    "_id" : ObjectId("5f351f3d9d90b1281c44c5dc"),
    "staffId" : 12347,
    "category" : "trend",
    "page_route" : "http://example.com/rerrwe",
    "expireAt" : ISODate("2020-08-13T11:08:45.196Z"),
    "createdAt" : ISODate("2020-08-13T11:08:45.199Z"),
    "updatedAt" : ISODate("2020-08-13T11:08:45.199Z"),
    "__v" : 0
}
{
    "_id" : ObjectId("5f351f3d9d90b1281c44c5dr"),
    "staffId" : 12348,
    "category" : "trend",
    "page_route" : "http://example.com/rerrwe",
    "expireAt" : ISODate("2020-08-12T11:08:45.196Z"),
    "createdAt" : ISODate("2020-08-08T11:08:45.199Z"),
    "updatedAt" : ISODate("2020-08-12T11:08:45.199Z"),
    "__v" : 0
}

Expected result: Example 1) Weekly

[
{_id: "2020-11-13", total: 2},
{_id: "2020-11-8", total: 2},


]

Example 2) Monthly

[
{_id: "2020-11-8", total: 4},

]

similarly for yearly ...

I am using nodejs and mongoose to implement the API.

I am struggle lot but I am unable to achieve the expected result.

if anyone help me then it will be great help.

Thanks to all Expert.

I have tried something like this:

[
        {
          $match: {
            createdAt: { $gte: new Date(currentDate), $lt: new Date(nextDate) }
          }
        },
        {
          $project: {
            _id: 1,
            staffId: 1,
            day: {
              $dayOfMonth: "$createdAt"
            },
            month: {
              $month: "$createdAt"
            },
            year: {
              $year: "$createdAt"
            }
          }
        },
        {
          $project: {
            _id: 1,
            staffId: 1,
            datetime: {
              $concat: [
                {
                  $substr: ["$year", 0, 4]
                },
                "-",
                {
                  $substr: ["$month", 0, 2]
                },
                "-",
                {
                  $substr: ["$day", 0, 2]
                }
              ]
            }
          }
        },
        {
          $group: {
            _id: {
              createdAt: "$datetime",
              staffId: "$staffId"
            }
          }
        },
        {
          $group: {
            _id: {$week:"$_id.createdAt"},
            total: {
              $sum: 1
            }
          }
        },
        { $sort: { _id: 1 } }
      ];

回答1:

You can try,

• Group by week

db.collection.aggregate([
  {
    $group: {
      _id: {
        year: { $year: "$createdAt" },
        week: { $week: "$createdAt" }
      },
      createdAt: { $first: "$createdAt" },
      count: { $sum: 1 }
    }
  }
])

Playground

• Group by month

db.collection.aggregate([
  {
    $group: {
      _id: {
        year: { $year: "$createdAt" },
        month: { $month: "$createdAt" }
      },
      createdAt: { $first: "$createdAt" },
      count: { $sum: 1 }
    }
  }
])

Playground

• Group by year

db.collection.aggregate([
  {
    $group: {
      _id: { $year: "$createdAt" },
      createdAt: { $first: "$createdAt" },
      count: { $sum: 1 }
    }
  }
])

Playground

You can change date format from your client side language using createdAt field!

来源：https://stackoverflow.com/questions/65285364/mongoose-date-comparing-without-time-and-group-by-createdat-and-staffid-with-wee