拆分和汇总数从阵列

我有我的MongoDB实例，看起来像下面拆分和汇总数从阵列

{ 
    ... 
    regions: ["Region-West", "Region-HC"], 
    care_levels: ["Memory Care"], 
    ... 
} 
{ 
    ... 
    regions: ["Region-West", "Region-SC"], 
    care_levels: ["Physical Rehab"], 
    ... 
} 
{ 
    ... 
    regions: ["Region-East", "Region-NC"], 
    care_levels: ["Physical Rehab"], 
    ... 
}

的地区和护理水平的文档都是一个字符串数组。我想执行由特定区域集和care_levels映射的文档数。例如 -

Region-East, Physical Rehab => 20 
Region-East, Memory Care => 20 
Region-West, Memory Care => 30

我运行下面的查询

db.incidents.aggregate([ 
    {$match: 
    {"care_levels": { $size: 1, $in: ["Memory Care", "Physical Rehab"] }}, 
    }, 
    { "$group": { 
     "_id": { 
      "regions": "$regions", 
      "care_levels": "$care_levels", 
     }, 
     "incidentCount": { "$sum": 1 } 
    }}, 
])

和我得到的结果作为

{ "_id" : { "regions" : [ "Region-East", "Region-HC" ], "care_levels" : [ "Memory Care" ] }, "incidentCount" : 2409 } 
{ "_id" : { "regions" : [ "Region-East", "Region-HC" ], "care_levels" : [ "Physical Rehab" ] }, "incidentCount" : 2459 } 
{ "_id" : { "regions" : [ "Region-East", "Region-SC" ], "care_levels" : [ "Memory Care" ] }, "incidentCount" : 2504 } 
{ "_id" : { "regions" : [ "Region-West", "Region-HC" ], "care_levels" : [ "Memory Care" ] }, "incidentCount" : 2382 } 
{ "_id" : { "regions" : [ "Region-West", "Region-HC" ], "care_levels" : [ "Physical Rehab" ] }, "incidentCount" : 2475 } 
{ "_id" : { "regions" : [ "Region-East", "Region-SC" ], "care_levels" : [ "Physical Rehab" ] }, "incidentCount" : 2478 } 
{ "_id" : { "regions" : [ "Region-South", "Region-HC" ], "care_levels" : [ "Physical Rehab" ] }, "incidentCount" : 2405 } 
{ "_id" : { "regions" : [ "Region-West", "Region-SC" ], "care_levels" : [ "Memory Care" ] }, "incidentCount" : 2490 } 
{ "_id" : { "regions" : [ "Region-West", "Region-SC" ], "care_levels" : [ "Physical Rehab" ] }, "incidentCount" : 2433 } 
{ "_id" : { "regions" : [ "Region-South", "Region-HC" ], "care_levels" : [ "Memory Care" ] }, "incidentCount" : 2465 }

我要过滤掉，我不关心的地区。在这种情况下，我不希望区域SC和区域HC的分割以及区域西/东/南的计数应该是区域SC和区域HC分割的值的总和。

具体来说，在这种情况下，我想要的值

Region-East, Memory Care => (2409 + 2504) 
Region-West, Memory Care => (2382 + 2490)

我如何通过进一步聚集实现这一目标？

来源

2017-01-09 FBTrix

我意识到一个简单的$放松在一开始就做我需要的东西。我之前使用错误的语法来解决问题。

来源

2017-01-09 06:53:35 FBTrix

拆分和汇总数从阵列

回答

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