Mongodb中基于聚合的聚合
我有一个mongo文件集,里面有印度的州、区和村庄Mongodb中基于聚合的聚合,mongodb,
elasticsearch,mongodb-query,aggregation-framework,Mongodb,
elasticsearch,Mongodb Query,Aggregation Framework,我有一个mongo文件集,里面有印度的州、区和村庄 { "_id" : ObjectId("58db5a5f8f7b5013ad477564"), "district" : "Chittor", "state" : "Andhra Pradesh", "village" : "Chittoor" }, { "_id" : ObjectId("58db5a628f7b5013ad477566"), "district" : "Dibrugarh",
{
"_id" : ObjectId("58db5a5f8f7b5013ad477564"),
"district" : "Chittor",
"state" : "Andhra Pradesh",
"village" : "Chittoor"
},
{
"_id" : ObjectId("58db5a628f7b5013ad477566"),
"district" : "Dibrugarh",
"state" : "Assam",
"village" : "Dibrugarh"
},
{
"_id" : ObjectId("58db5a628f7b5013ad47756d"),
"district" : "Lakhimpur",
"state" : "Assam",
"village" : "Kadam"
},
{
"_id" : ObjectId("58db5a628f7b5013ad47756e"),
"district" : "Sonitpur",
"state" : "Assam",
"village" : "Helem"
},
{
"_id" : ObjectId("58db5a628f7b5013ad477572"),
"district" : "Gandhinagar",
"state" : "Gujarat",
"village" : "Mansa"
},
{
"_id" : ObjectId("58db5a628f7b5013ad477573"),
"district" : "Gandhinagar",
"state" : "Gujarat",
"village" : "Kalol"
},
{
"_id" : ObjectId("58db5a628f7b5013ad477574"),
"district" : "Ahmadabad",
"state" : "Gujarat",
"village" : "Barwala"
}
我想按州、区和村对其进行分组,以使我能够以以下格式显示结果
[
{
"state": "Gujarat",
"districts": [
{
"district": "Gandhinagar",
"villages": [
{
"village": "Mansa"
},
{
"village": "Kalol"
}
]
},
{
"district": "Ahmadabad",
"villages": [
{
"village": "Barwala"
}
]
}
]
},
{
"state": "Assam",
"districts": [
{
"district": "Sonitpur",
"villages": [
{
"village": "Helem"
}
]
},
{
"district": "Lakhimpur",
"villages": [
{
"village": "Kadam"
}
]
},
{
"district": "Dibrugarh",
"villages": [
{
"village": "Dibrugarh"
}
]
}
]
},
{
"state": "Andhra Pradesh",
"districts": [
{
"district": "Chittor",
"villages": [
{
"village": "Chittor"
}
]
}
]
}
]
我尝试过,但没有找到一种方法来获得这样的聚合
1) db.historical_prices.aggregate({$group: {_id: {"state": "$state"}}}, {$group: {_id: {"commodity": "$commodity"}}})
2) db.places.aggregate()
.match(qb.where("enabled").eq(false))
.group({ _id: {"state": "$state", "district": "$district"}, "districts": {$push: {district: "$district"}}, })
我在elasticsearch
中计算出了这种聚合
GET /places/_search
{
"query": { "match_all": {} },
"size": 0,
"aggs": {
"group_by_state": {
"terms": {
"field": "state.keyword"
},
"aggs": {
"group_by_district": {
"terms": {
"field": "district.keyword"
},
"aggs": {
"group_by_village": {
"terms": {
"field": "village.keyword"
}
}
}
}
}
}
}
}
如何在
MongoDB
中获取此信息?因为我不想仅仅为了做这件事而使用elasticsearch。你可以在下面尝试。下面的查询是州上的$group
和地区累积村庄,然后是州上的$group
累积地区和以前收集的村庄
db.collection.aggregate([{
$group: {
_id: {state:"$state", district:"$district"},
"villages":{$addToSet:{village:"$village"}}
}
},{
$group: {
_id: {state:"$_id.state"},
"districts":{$push:{villages:"$villages", district:"$_id.district"}}
}
}])
通过尝试更新了它。