[英]MongoDB - find count of field in nested document
I want to find the count of all occurrences of the field "36" from the the following json: The count should be 2. The field is present in any of the data.TL.TXXX documents.我想从以下 json 中查找所有出现的字段“36”的计数:计数应为 2。该字段存在于任何 data.TL.TXXX 文档中。 I tried the find() method of mongoDB, but could only search in one document at a time.
我尝试了 mongoDB 的 find() 方法,但一次只能搜索一个文档。 Probably I need a regex here.
可能我在这里需要一个正则表达式。 Can someone help me out:
有人可以帮我吗:
{
"_id" : ObjectId("1115dd31af82eb3ca8028188"),
"data" : {
"TL" : {
"T001" : {
"11" : "05012017",
"13" : "0",
"28" : "000",
"29" : "00000",
"30" : "01012017",
"31" : "01122014",
"36" : "10000",
"37" : "3000",
"38" : "29.81",
"39" : "1",
"44" : "03",
"02" : "NOT DISCLOSED",
"04" : "10",
"05" : "1",
"08" : "16122014"
}
}
}
},
{
"_id" : ObjectId("345222ddaf82eb1b262be44f"),
"data" : {
"TL" : {
"T004" : {
"10" : "19052013",
"11" : "15062013",
"12" : "37903",
"13" : "0",
"28" : "00000000",
"29" : "000000000000000000",
"30" : "01052013",
"31" : "01062011",
"44" : "03",
"02" : "NOT DISCLOSED",
"04" : "10",
"05" : "1",
"08" : "27062011",
"09" : "08052013"
},
"T005" : {
"11" : "10012017",
"12" : "114525",
"13" : "8853",
"28" : "00000300000300000",
"29" : "000000XXX0000000010",
"30" : "01012017",
"31" : "01022014",
"36" : "100000",
"37" : "10000",
"44" : "03",
"45" : "6714",
"02" : "NOT DISCLOSED",
"04" : "10",
"05" : "1",
"08" : "27062011",
"09" : "12122016"
},
}
}
}
You can use below aggregation您可以使用以下聚合
db.collection.aggregate([
{ $project: { "data.TL": { $objectToArray: "$data.TL" }}},
{ $unwind: "$data.TL" },
{ $project: { data: { $objectToArray: "$data.TL.v" }}},
{ $unwind: "$data" },
{ $group: { _id: "$data.k", count: { $sum: 1 }}}
]);
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