Question

我有这样的JSON，我想按状态false进行计数 JSON img

{
  "chats": [
    {
      "memberId": "ff9e28ec-4f6f-42e2-9e66-43b888267fe5",
      "messages": [
        {
          "messagesId": "54174c03-c669-44fb-872a-75ff5c52166f",
          "user": {
            "userId": "4dd8495a-5704-435d-bee2-6b474e25cbbf",
            "name": "Event",
            "profilePicture": "png"
          },
          "createdAt": "",
          "title": "belajar",
          "image": "minio.png",
          "messages": "belajar",
          "status": false
        }
      ]
    }
  ]
}

我想获取状态为false的所有邮件的计数。

示例

{
 "memberId" : "ff9e28ec-4f6f-42e2-9e66-43b888267fe5"
 "statusCount" : 2
}

Answer 1

db.getCollection('inbox').aggregate([
{ "$unwind": "$chats" },
{
  "$match": {
    "chats.messages.status": false
  }
},
{ "$unwind": "$chats.messages" },
{ "$group": { 
    "_id": "$chats.memberId",
    "count": { "$sum": 1 }
}}])

我尝试此查询，结果为

{
"_id" : ObjectId("5d207957e887785f2c0c745e"),
"count" : 4.0
}

这是您想要的吗？

Answer 2

像这样解决查询

db.inbox.aggregate([
{ $unwind: "$chats" },
{ $unwind: "$chats.messages" },
{
  $match: {
    "chats.messages.status": false
  }
},
{
    $group: {
        _id: { inboxId: "$inboxId", memberId: "$chats.memberId" },
            count: { $sum :1 }
        }
    },
    {
        $project : {inboxId : '$_id.inboxId', memberId : '$_id.memberId', count : '$count', _id : 0}

    }

])

如何在数组对象MongoDB中计算值状态等于false

2 个答案: