如何查询和仅返回mongodb中具有键值的元素?
db.test.find({'componentStubs': { $all:[ {$elemMatch: {"id":6484} }] } })
成功查询,但返回整个数组。如何返回单个字段
[
{
"_id": ObjectId("5d1b8e0411919967a193d6c5"),
"componentStubs": [
{
"id": 6458,
"name": "DTCP-DDNBEED01A",
"modelId": 282,
"modelName": "Elektron EDGE",
"modelVersion": 18,
"lastUpdated": 1562029651988
},
{
"id": 6459,
"name": "DTCP-DDNBEED01B",
"modelId": 282,
"modelName": "Elektron EDGE",
"modelVersion": 18,
"lastUpdated": 1562029651808
},
{
"id": 6460,
"name": "DTCP-DDNBEED02A",
"modelId": 282,
"modelName": "Elektron EDGE",
"modelVersion": 18,
"lastUpdated": 1562029655639
},
{
"id": 6461,
"name": "DTCP-DDNBEED02B",
"modelId": 282,
"modelName": "Elektron EDGE",
"modelVersion": 18,
"lastUpdated": 1562029647511
}
]
}
]