How to get the documents based on Date Filters(Week, Month and Custom Dates) in MongoDB?

问题

I am trying to fetch all the documents based on date filters as below in MongoDB:

1. This Week only
2. Last Week only
3. This Month only
4. Last Month only
5. Between Custom Dates.

My collection:

[
  {
    _id: "123",
    status: "seen",
    userId: "589",
    createdAt: ISODate("2020-11-17T04:35:29.646Z"),
  },
  {
    _id: "223",
    status: "seen",
    userId: "589",
    createdAt: ISODate("2020-11-17T04:35:29.646Z"),
  },
  {
    _id: "474",
    status: "unseen",
    userId: "589",
    createdAt: ISODate("2020-11-10T04:35:29.646Z"),

  },
  {
    _id: "875",
    status: "seen",
    userId: "112",
    createdAt: ISODate("2020-10-11T04:35:29.646Z"),
  },
  {
    _id: "891",
    status: "unseen",
    userId: "112",
    createdAt: ISODate("2020-10-11T04:35:29.646Z"),
  },
  {
    _id: "891",
    status: "unseen",
    userId: "113",
    createdAt: ISODate("2020-11-09T04:35:29.646Z"),
  }]

Expected Result:

1. When This_Week Filter is applied - fetch all the userIds whose createdAt falls in this week and then calculate the notification percentage.

  [{
    userId : "589",
    notificationPercentage: 100% // Because userId 589 has 2 seen documents for this week.
  }]

2. When This_Month filter is applied: - userId 589 and userId 113 was created in this month and calculating the notificationPercentage for it.

[{
  userId : "589",
  notificationPercentage: 66.66% 
},
{
  userId : "113",
  notificationPercentage: 0% 
}]

3. When Last_month filter is applied:

[{
  userId : "112",
  notificationPercentage: 50% //Because only userId 112 was created in last month and finding the notification percentage for it.
}]

4. When Last_week filter is applied:

[{
  userId : "113",
  notificationPercentage: 0% //Because only userId 113 was created in last week and finding the notification percentage for it.
},
{
  userId : "589",
  notificationPercentage: 0% //Because only userId 113 was created in last week and finding the notification percentage for it.
}]

Formula for notification percentage - (No of times the user has seen/no of times he got notifications) * 100

回答1:

You may have some thing like following. Use match operation to filter out. In this example I have shown you the last_week details. I checked all scenarios that you mentioned above. And its working fine

[{$match: {
  $expr:{
    $and:[
      {$gt:["$createdAt",new Date(new Date()-14*60*60*24*1000)]},
      {$lt:["$createdAt",new Date(new Date()-7*60*60*24*1000)]}
      ]
  }
}}, {$group: {
  _id: '$userId',
  totalSeen: {
    $sum: {
      $cond: [
        {
          $eq: [
            '$status',
            'seen'
          ]
        },
        1,
        0
      ]
    }
  },
  total: {
    $sum: 1
  }
}}, {$project: {
  _id: 0,
  userId: '$_id',
  notificationPercentage: {
    $multiply: [
      {
        $divide: [
          '$totalSeen',
          '$total'
        ]
      },
      100
    ]
  }
}}]

来源：https://stackoverflow.com/questions/64924624/how-to-get-the-documents-based-on-date-filtersweek-month-and-custom-dates-in