[英]fetch nested array from mongodb and display in frontend using node js
[英]How to fetch record from multi-di array using mongodb query in node js?
我是mongodb的新手,在这里我想获取与u_id条件匹配的记录等于特定的u_id。 我感到困惑的是应该在哪里/什么条件应用那里获取特定记录。
connection.model.find( {'abc.sar.0.u_id': new ObjectID( '56e3e5b6fb33e53f119051f2' )} , function ( err, result ) { });
[
{
"_id": "56e15c49908fb5af0238f05c",
"abc": {
"sar": [
{
"u_id": "56e18c33909aa6f214e17dec",
"cd": null,
"_id": "56e18c33909aa6f214e17df0"
},
{
"u_id": "56e18c4a909aa6f214e17df1",
"cd": null,
"_id": "56e18c4a909aa6f214e17df5"
},
{
"u_id": "56e18f6a909aa6f214e17df6",
"cd": null,
"_id": "56e18f6a909aa6f214e17dfa"
},
{
"u_id": "56e3c477a8b75d720c73e5a7",
"cd": null,
"_id": "56e3c477a8b75d720c73e5ab"
},
{
"u_id": "56e3e5b6fb33e53f119051f2",
"cd": null,
"_id": "56e3e5b6fb33e53f119051f6"
},
{
"u_id": "56e3e60efb33e53f119051f7",
"cd": null,
"_id": "56e3e60efb33e53f119051fb"
},
{
"u_id": "56e3eaedc0e2dba711805f0e",
"cd": null,
"_id": "56e3eaedc0e2dba711805f12"
},
{
"u_id": "56e3eb85f81fe30d12507709",
"cd": null,
"_id": "56e3eb86f81fe30d1250770d"
}
]
}
}
]
您要使用$ elemMatch 。
connection.model.find({
'abc.sar' : {
$elemMatch : {'u_id': new ObjectID( '56e3e5b6fb33e53f119051f2' )}
}
});
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