[英]mongodb aggregation and sorting on nested array
下面是我的mongo db文档结构
{
"product_json": {
"productId": 1,
"productData": [
{
"productName": "A",
"productDetails": [
{
"manufacturedDate": "2014-08-09",
"name": "A1",
"size": 300
},
{
"manufacturedDate": "2012-08-09",
"name": "A2",
"size": 200
}
]
},
{
"productName": "B",
"productDetails": [
{
"manufacturedDate": "2015-08-09",
"name": "B1",
"size": 300
},
{
"manufacturedDate": "2017-08-09",
"name": "B2",
"size": 200
}
]
}
]
}
}
我需要对“ manufacturedDate”进行分组并应用sorting.Also我也不希望整个文档都为match.only匹配的对象(匹配的productDetails对象)。
试试这个查询:
db.collection.aggregate(
[
{$sort: {'product_json.productData.productDetails.manufacturedDate': 1}},
{ $group:{
"_id": "$product_json.productData.productDetails.manufacturedDate"
}
}
]
);
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