MongoDb过滤器阵列 [英] MongoDb Filter Array
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问题描述
数据结构:
[{
"_id": {
"$oid": "5f1e91da1d840d673d159e69"
},
"product": [
{
"_id": "1",
"name": "FirstWarehouseName1",
"image": "FirstWarehousePhoto1",
"manufacturer": "FirstWarehouseProducer1",
"warehouse": "Warehouse1",
"price": "32",
"amount": 344
},
{
"_id": "2",
"name": "FirstWarehouseName2",
"image": "FirstWarehousePhoto2",
"manufacturer": "FirstWarehouseProducer2",
"warehouse": "Warehouse1",
"price": "12",
"amount": 631
},
{
"_id": "3",
"name": "FirstWarehouseName3",
"image": "FirstWarehousePhoto3",
"manufacturer": "FirstWarehouseProducer3",
"warehouse": "Warehouse1",
"price": "66",
"amount": 752
}
],
"_class": "pl.com.ttsw.intership.product_model.Products"
},{
"_id": {
"$oid": "5f1e91da1d840d673d159e6a"
},
"product": [
{
"_id": "1",
"name": "SecondWarehouseName1",
"image": "SecondWarehousePhoto1",
"manufacturer": "SecondWarehouseProducerName1",
"warehouse": "Warehouse2",
"price": "32",
"amount": 344
},
{
"_id": "2",
"name": "SecondWarehouseName2",
"image": "SecondWarehousePhoto2",
"manufacturer": "SecondWarehouseProducerName2",
"warehouse": "Warehouse2",
"price": "12",
"amount": 631
},
{
"_id": "3",
"name": "SecondWarehouseName3",
"image": "SecondWarehousePhoto3",
"manufacturer": "SecondWarehouseProducerName3",
"warehouse": "Warehouse2",
"price": "66",
"amount": 752
}
],
"_class": "pl.com.ttsw.intership.product_model.Products"
},{
"_id": {
"$oid": "5f1e91db1d840d673d159e6b"
},
"product": [
{
"_id": "1",
"name": "ThirdWarehouseName1",
"image": "ThirdWarehousePhoto1",
"manufacturer": "ThirdWarehouse1",
"warehouse": "Warehouse3",
"price": "44",
"amount": 123
},
{
"_id": "2",
"name": "ThirdWarehouseName2",
"image": "ThirdWarehousePhoto2",
"manufacturer": "ThirdWarehouse2",
"warehouse": "Warehouse3",
"price": "11",
"amount": 442
},
{
"_id": "3",
"name": "ThirdWarehouseName3",
"image": "ThirdWarehousePhoto3",
"manufacturer": "ThirdWarehouse3",
"warehouse": "Warehouse3",
"price": "2",
"amount": 2213
}
],
"_class": "pl.com.ttsw.intership.product_model.Products"
}]
我也这样尝试:
/////////////////////////////////////////////////////////////////我需要按名称来命名数组中的过滤器数组(仓库中的产品)；如果我不做任何项目，则Array的所有产品都是如此.如果(按名称3"搜索)输出结果
/////////////////////////////////////////////////////////////// I need filter array in array(products in warehouses) by their names; If I do without project response is Array with all products. Output results if (search By "Name3")
[{
"_id": {
"$oid": "5f1e91da1d840d673d159e69"
},
"product": [
{
"_id": "3",
"name": "FirstWarehouseName3",
"image": "FirstWarehousePhoto3",
"manufacturer": "FirstWarehouseProducer3",
"warehouse": "Warehouse1",
"price": "66",
"amount": 752
}
]
},{
"_id": {
"$oid": "5f1e91da1d840d673d159e6a"
},
"product": [
{
"_id": "3",
"name": "SecondWarehouseName3",
"image": "SecondWarehousePhoto3",
"manufacturer": "SecondWarehouseProducerName3",
"warehouse": "Warehouse2",
"price": "66",
"amount": 752
}
]
},{
"_id": {
"$oid": "5f1e91db1d840d673d159e6b"
},
"product": [
{
"_id": "3",
"name": "ThirdWarehouseName3",
"image": "ThirdWarehousePhoto3",
"manufacturer": "ThirdWarehouse3",
"warehouse": "Warehouse3",
"price": "2",
"amount": 2213
}
]
}]
我尝试了所有方法，但无法解决.//////////////////////////////
I tried all ways and I can't manage. ////////////////////////////////
推荐答案
您可以
[{
$unwind: {
path: "$product",
preserveNullAndEmptyArrays: false
}
}, {
$match: {
"product.name": {
$regex: "Name3"
}
}
}, {
$group: {
_id: "$_id",
product: {
$push: "$product"
}
}
}]
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