我试图在$ unwind之后返回嵌套文档的完整列表

Question

请原谅，我是MongoDB聚合框架的新手。我有以下带有“历史记录”作为嵌套文档的集合，并且我试图将匹配的集合与历史记录的完整列表一起投影，但是我的查询仅返回嵌套历史记录中的匹配元素。

$.a[0].value

这是我的查询

{
    "_id" : ObjectId("5cc75fbcd1de1e96e0925a7e"),
    "case_id" : "5002J00001E2JheQAF",
    "__v" : 0,
    "account_id" : "0015000000xxYAWAA2",
    "account_name" : "HelloWorld",
    "caseNumber" : "C1000013634",
    "caseOrigin" : "Email",
    "case_type" : "A-Partner",
    "create_date" : ISODate("2019-04-29T20:15:48.000Z"),
    "current_mrr" : null,
    "escalated_team" : null,
    "history" : [ 
        {
            "_id" : ObjectId("5cdad34e4520d570fc0f6a85"),
            "history_id" : "0172J0000tXXzkuQAD",
            "field" : "created",
            "new_value" : null,
            "old_value" : null,
            "created_date" : ISODate("2019-04-29T20:15:52.000Z"),
            "created_by_id" : "005500000071WBzAAM"
        }, 
        {
            "_id" : ObjectId("5cdad34e4520d570fc0f6a84"),
            "history_id" : "0172J0000tXXzkyQAD",
            "field" : "Provider_Group__c",
            "new_value" : "HelloWorld Provisioning",
            "old_value" : "SGS - Web and Chat",
            "created_date" : ISODate("2019-04-29T20:15:52.000Z"),
            "created_by_id" : "005500000071WBzAAM"
        }, 
        {
            "_id" : ObjectId("5cdad34e4520d570fc0f6a7d"),
            "history_id" : "0172J0000tYzZgoQAF",
            "field" : "Status",
            "new_value" : "In Progress",
            "old_value" : "Pending Customer Response",
            "created_date" : ISODate("2019-04-30T13:38:38.000Z"),
            "created_by_id" : "005500000071WBzAAM"
        },
        {
            "_id" : ObjectId("5cdad34e4520d570fc0f6a7b"),
            "history_id" : "0172J0000tYzbgJQAR",
            "field" : "Status",
            "new_value" : "Resolved",
            "old_value" : "In Progress",
            "created_date" : ISODate("2019-04-30T13:54:44.000Z"),
            "created_by_id" : "0052J000007nM11QAE"
        }
    ],
  "feeds" : [ 
        {
            "_id" : ObjectId("5cdad34e4520d570fc0f6a78"),
            "feed_id" : "0D52J00006qBd5PSAS",
            "event" : "TextPost",
            "created_by_id" : "0052J000007nM11QAE",
            "visibility" : "InternalUsers",
            "created_date" : ISODate("2019-04-30T13:54:42.000Z")
        }, 
        {
            "_id" : ObjectId("5cdad34e4520d570fc0f6a77"),
            "feed_id" : "0D52J00006qBd4kSAC",
            "event" : "EmailMessageEvent",
            "created_by_id" : "0052J000007nM11QAE",
            "visibility" : "InternalUsers",
            "created_date" : ISODate("2019-04-30T13:54:32.000Z")
        }, 
        {
            "_id" : ObjectId("5cdad34e4520d570fc0f6a76"),
            "feed_id" : "0D52J00006qBc4GSAS",
            "event" : "EmailMessageEvent",
            "created_by_id" : "005500000071WBzAAM",
            "visibility" : "InternalUsers",
            "created_date" : ISODate("2019-04-30T13:38:34.000Z")
        }
    ],
    "issue_level" : "HelloWorld",
    "last_month_service_mrr" : 572.866,
    "last_update" : ISODate("2019-05-14T14:00:39.000Z"),
    "owner" : "Ajay AJAY",
    "owner_id" : "0052J000007nM11QAE",
    "product" : "Virtual World",
    "provider_group" : "HelloWorld Provisioning",
    "provider_group_manager" : null,
    "provider_group_manager_email" : null,
    "resolve_date" : ISODate("2019-04-30T13:54:42.000Z"),
    "rt" : null,
    "service_mrr" : 583,
    "severity" : null,
    "status" : "Closed",
    "subject" : "HelloWorld - The Complex - 7516664 - Unsuspend",
    "support_country" : null,
    "support_group" : "Support - ETS"
}

我该怎么做才能返回完整的历史记录列表？

Answer 1

我的查询可以满足我的要求，但没有返回匹配文档的完整历史记录列表。唯一的方法是使用返回的案例进行第二次查询以检索完整文档。

db.getCollection('cases').aggregate([
{ 
     $match: {
          "history.created_date": { 
               '$gte': new Date("2019-04-01T00:00:00"),
               '$lte': new Date("2019-04-30T23:59:59") 
          }
     }
},
{ 
    "$unwind": "$history"
}
,{
    "$match": {
        "history.created_date":{
               '$gte': new Date("2019-04-01T00:00:00"),
               '$lte': new Date("2019-04-30T23:59:59")
        },
        "$or" :[{"history.new_value":{
            "$in":['Tier 2','Global Application Support Team','HelloWorld Provisioning'],
        }},{
            "history.field" : "Resolved"
        }],

        "history.old_value":{
            "$nin":['HelloWorld Provisioning','Global Application Support Team'],
        },
     }
}
,{
     $group: {
          "_id": {
              year: {
                  $year: "$history.created_date"
              },
              month: {
                  $month: "$history.created_date"
              },
              week: {
                  $week: "$history.created_date"
              }
          },
          cases:  {$addToSet: "$caseNumber"}
     }
},{
                $project: {
                    "dates": "$_id",
                    _id: 0,
                    "cases": "$cases"
                }
            },
            {$sort: {_id: 1}}
])