MongoDB查询嵌套分组

Question

我有3个收藏集：

1. 计划
2. 业务流程
3. 恢复策略

他们三个人的主键分别存储在<VirtualHost *:80> ServerName www.phusion.nl DocumentRoot /websites/phusion/public <Directory /websites/phusion> Allow from all Options -MultiViews # Uncomment this if you're on Apache >= 2.4: #Require all granted </Directory> Alias /subapp /websites/secondapp/public <Location /subapp> PassengerBaseURI /subapp PassengerAppRoot /websites/secondapp PassengerAppType wsgi PassengerStartupFile passenger_wsgi.py </Location> <Directory /websites/secondapp/public> Allow from all Options -MultiViews # Uncomment this if you're on Apache >= 2.4: #Require all granted </Directory> 和

中

我还有另一个收藏集：_id，其中存储着

1. planRecoveryStrategy
2. planId
3. businessProcessId

存储在recoveryStrategyId中的示例文档：

planRecoveryStrategy

给定{ "planId" : "PLN1", "processId" : "PCS1", "strategyId" : "RES1" } { "planId" : "PLN1", "processId" : "PCS2", "strategyId" : "RES1" } { "planId" : "PLN1", "processId" : "PCS2", "strategyId" : "RES2" } 为'PCS1'时要写的查询是什么

planId

来自{ "planId" : "PLN1", "processes" : [{ "processId":"PCS1", "processData":{<data from Business Process Dictionary for PCS1>}, "strategies":[{<data from Recovery Strategy Dictionary for RES1>}] }, { "processId":"PCS2", "processData":{<data from Business Process Dictionary for PCS1>}, "strategies":[{<data from Recovery Strategy Dictionary for RES1>}, {<data from Recovery Strategy Dictionary for RES2>}] }] } ？

Answer 1

尝试对数据进行分组：

db.collection.aggregate([
    {
        $group: {
            _id: {
                planId: "$planId",
                processId: "$processId"
            },
            strategies: { $addToSet: "$strategyId" }
        }
    },
    {
        $group: {
            _id: "$_id.planId",
            planId: { $first: "$_id.planId" },
            processes: {
                $addToSet: {
                    processId: "$_id.processId",
                    strategies: "$strategies"
                }
            }
        }
    }
]);

排序：

db.collection.aggregate([
    { $sort: { "strategyId": -1 } },
    { $sort: { "processId": 1 } },
    {
        $group: {
            _id: {
                planId: "$planId",
                processId: "$processId"
            },
            strategies: { $addToSet: "$strategyId" }
        }
    },
    {
        $group: {
            _id: "$_id.planId",
            planId: { $first: "$_id.planId" },
            processes: {
                $addToSet: {
                    processId: "$_id.processId",
                    strategies: "$strategies"
                }
            }
        }
    }
]);

包括其他收藏夹：

db.collection.aggregate([
    { $sort: { "strategyId": -1 } },
    { $sort: { "processId": 1 } },
    {
        $lookup:
          {
            from: "BusinessProcess",
            localField: "processId", 
            foreignField: "id",
            as: "BusinessProcesses"
          }
    },
    {
        $lookup:
          {
            from: "RecoveryStrategy",
            localField: "strategyId", 
            foreignField: "id",
            as: "RecoveryStrategy"
          }
    },
    {
        $group: {
            _id: {
                planId: "$planId",
                processId: "$processId",
                processData: { $arrayElemAt : ["$BusinessProcesses" , 0] },
            },
            strategies: { $addToSet: "$RecoveryStrategy" }
        }
    },
    {
        $group: {
            _id: "$_id.planId",
            planId: { $first: "$_id.planId" },
            processes: {
                $addToSet: {
                    processId: "$_id.processId",
                    processData: "$_id.processData",
                    strategies: "$strategies"
                }
            }
        }
    }
]);