mongodb - 对复杂的过滤记录进行分组

Question

我只想看看我有多少人拥有特定的区块 ID。在按块 ID 过滤数组后，我尝试对“bot_survey”进行分组，但我无法获得正确的结果。这是我的 2 条记录

{
    date: '2019-06-13',
    blocks:[
        {
            block_id: '5caf27cfcb4b530e4d51bb72',
            triggered_by:[
                {
                    person_id: '2342'
                },
                {
                    person_id: '436'
                }
            ]
        }
    ]

},
{
    date: '2019-06-14',
    blocks:[
        {
            block_id: '5caf27cfcb4b530e4d51bb72',
            triggered_by:[
                {
                    person_id: '2342'
                },
                {
                    person_id: '965'
                }
            ]
        }
    ]

},

这是我的查询

db.getCollection('analytics').aggregate([
   {$match: {date: {$lte: '2019-06-13'},"blocks.block_id": '5caf27cfcb4b530e4d51bb72'}},
   {
      $project: {
         date: 1,
         bot_survey: {
            $filter: {
               input: "$blocks",
               as: "blocks",
               cond: { $eq: [ "$$blocks.block_id", '5caf27cfcb4b530e4d51bb72' ] }
            }
         }
      }
   },
   {
    $group: {
      _id: {date: "$bot_survey.triggered_by.person_web_id"},
   }
  }
])

但我需要一个类似的结果

{
 person_id: '2342',
 person_id: '436',
 person_id: '965'
}

所以我可以计算结果。我怎样才能做到这一点？

Answer 1

根据您的输入数据，您可以进行聚合，例如，

db.orders.aggregate([
    {
        $unwind: "$blocks"
    },
        {
        $unwind: "$blocks.triggered_by"
    },
    {
        $group: {
           _id: "$blocks.block_id",
           triggered_by: { $addToSet: 
          {person_id:"$blocks.triggered_by.person_id"}  }
    }
}
])

输出：

{"_id":"5caf27cfcb4b530e4d51bb72","triggered_by":[{"person_id":"2342"},{"person_id":"965"},{"person_id":"436"}]}