$unwind 嵌入文档中存在多个 arrays 并将每个数组显示为单个文档，如 mongoDB 中的 output

Question

参考下面的代码。 在此，现场场景是一个嵌入式文档，其中包含 arrays，我想在 output 中将每个数组展示为单个文档。 请注意，每个数组都包含嵌入的文档，因此获取从中提取字段的代码也会很有帮助。 我没有使用 java 进行查询。 将使用将集成的外部 BI 应用程序。我还应该提到我正在使用 NoSQLBooster 为 MongoDB 应用程序创建这些查询。

{
    "_id": {
        "$oid": ""
    },
    "organisationId": "",
    "bcpId": "",
    "bcpName": "",
    "bcpDescription": "",
    "biaEntity": {},
    "version": "0.01",
    "status": "PENDING",
    "primaryBridgeNumber": "1",
    "alternateBridgeNumber": "2",
    "scenario": [{
        "_id": {
            "$oid": "5e3ab709367d2c5f5826c6fd"
        },
        "scenario": "",
        "strategies": [{
            "mdmStrategy": {},
            "strategy": {
                "pSIStrategyDetails": {
                    "scenarioName": "",
                    "strategyName": "",
                    "rto": "",
                    "sustainablePeriod": {

                    },
                    "description": "1",
                    "primaryContact": {
                    },
                    "secondaryContact": {
                    },
                    "recoverySite": {

                    }
                },
                "pSICriticalStaff": {},
                "specialRequirement": [{

                }, {

                }, {

                }, {

                }, {

                }]
            },
            "createdOn": {},
            "updatedOn": {}
        }, {
            "mdmStrategy": {},
            "strategy": {
                "pSIStrategyDetails": {},
                "pSICriticalStaff": {},
                "specialRequirement": [{
                },
                 {
                },
                 {
                },
                 {                  
                }, 
                {

                }]
            },
            "createdOn": {},
            "updatedOn": }
        }],
        "description": "",
        "status": "Active",
        "createdOn": {},
        "updatedOn": {}
    }],
    "updatedOn": {},
    "createdOn": {},
    "business_owner_id": {},
    "bc_coordinator_id": {},
    "backup_business_owner_id": {},
    "backup_business_coordinator_id": {},
    "sme_id": {},
    "_class": "com.bcm.bcp.api.model.BcmBcpEntity"
}

预期 output：

{{
"bcpId": "",
"bcpName": "",
"bcpDescription": "",
"version": "0.01",
"status": "PENDING",
"scenario.scenario":"---",
"scenario.strategies.strategy.strategyName":"---",
"scenario.strategies.strategy.rto":"---",
etc...
}{
"bcpId": "",
"bcpName": "",
"bcpDescription": "",
"version": "0.01",
"status": "PENDING",
"scenario.scenario":"---",
"scenario.strategies.strategy.strategyName":"---",
"scenario.strategies.strategy.rto":"---",
etc...
}{
"bcpId": "",
"bcpName": "",
"bcpDescription": "",
"version": "0.01",
"status": "PENDING",
"scenario.scenario":"---",
"scenario.strategies.strategy.strategyName":"---",
"scenario.strategies.strategy.rto":"---",
etc...
}}

"scenario.scenario":"---","scenario.strategies.strategy.strategyName":"---", "scenario.strategies.strategy.rto":"---",

将来自 arrays 因此 output 将是数组中存在的元素数

Answer 1

你希望这是你想要的：

db.collection.aggregate([
  {
    $unwind: "$scenario"
  },
  {
    $unwind: "$scenario.strategies"
  },
  {
    $project: {
      bcpId: 1,
      bcpName: 1,
      bcpDescription: 1,
      version: 1,
      status: 1,
      scenario: {
        scenario: 1,
        strategies: {
          strategy: {
            pSIStrategyDetails: {
              rto: 1,
              strategyName: 1
            }
          }
        }
      }
    }
  }
])

Output：

[
  {
    "_id": ObjectId("5a934e000102030405000000"),
    "bcpDescription": "",
    "bcpId": "",
    "bcpName": "",
    "scenario": {
      "scenario": "",
      "strategies": {
        "strategy": {
          "pSIStrategyDetails": {
            "rto": "",
            "strategyName": ""
          }
        }
      }
    },
    "status": "PENDING",
    "version": "0.01"
  },
  {
    "_id": ObjectId("5a934e000102030405000000"),
    "bcpDescription": "",
    "bcpId": "",
    "bcpName": "",
    "scenario": {
      "scenario": "",
      "strategies": {
        "strategy": {
          "pSIStrategyDetails": {}
        }
      }
    },
    "status": "PENDING",
    "version": "0.01"
  }
]

说明：您需要使用 2 个$unwind运算符，因为它类似于 arrays 的 arrays 和一个$project运算符来仅显示您需要的那些字段。

MongoPlayGroundLink

PS - 这个问题还不清楚。