MongoDB-从对象仅返回一个匹配的数组元素

Question

我的一个项目集。

{
    "id": {
       "$oid": "5f4600ab7ec81f6c20f8608d"
    },
    "name": "2",
    "category": "2",
    "description": "2",
    "deadline": "2020-08-10",
    "createdBy": {
        "$oid": "5f5089a2265ec85b896f848f"
    },
    "__v": 116,
    "todos": [{
        "time": {
            "$date": "2020-09-10T06:15:36.168Z"
        },
        "doneAt": {
            "$date": "2020-09-10T16:51:53.534Z"
        },
        "done": true,
        "_id": {
            "$oid": "5f59c4f53f0095593b2ace25"
        },
        "user": {
            "$oid": "5f3fcbcae5efa018cc3c9b9d"
        },
        "text": "ooooooo"
    }, {
        "time": {
            "$date": "2020-09-05T13:11:14.139Z"
        },
        "doneAt": null,
        "done": false,
        "_id": {
            "$oid": "5f538f1eeef4d614830e843c"
        },
        "user": {
            "$oid": "5f5089a2265ec85b896f848f"
        },
        "text": "11"
    }],
    "bugs": [{
        "time": {
            "$date": "2020-09-09T03:30:45.463Z"
        },
        "fixedAt": null,
        "fixed": false,
        "_id": {
            "$oid": "5f584f152c5530129ff36ea2"
        },
        "user": {
            "$oid": "5f3fcbcae5efa018cc3c9b9d"
        },
        "text": "new bug"
    }, {
        "time": {
            "$date": "2020-09-06T09:35:12.848Z"
        },
        "fixedAt": null,
        "fixed": false,
        "_id": {
            "$oid": "5f54e1220297a57896646e98"
        },
        "user": {
            "$oid": "5f3fcbcae5efa018cc3c9b9d"
        },
        "text": "4"
    }, {
        "time": {
            "$date": "2020-09-06T09:35:12.848Z"
        },
        "fixedAt": null,
        "fixed": false,
        "_id": {
            "$oid": "5f54e0fc0297a57896646e97"
        },
        "user": {
            "$oid": "5f3fcbcae5efa018cc3c9b9d"
        },
        "text": "5"
    }],
    "members": [{
        "_id": {
            "$oid": "5f57725977ead80a566855e4"
        },
        "user": {
            "$oid": "5f3fcbcae5efa018cc3c9b9d"
        }
    }, {
        "_id": {
            "$oid": "5f576452fe05ec34a1bc487b"
        },
        "user": {
            "$oid": "5f4c8654f4b8c6671d5926ac"
        }
    }, {
        "_id": {
            "$oid": "5f562a971e16aa39ca290391"
        },
        "user": {
            "$oid": "5f5089a2265ec85b896f848f"
        }
    }]
}

有更多的项目集合。我只在这里放一个。我的目标是检索一个错误元素 例如

{
        "time": {
            "$date": "2020-09-09T03:30:45.463Z"
        },
        "fixedAt": null,
        "fixed": false,
        "_id": {
            "$oid": "5f584f152c5530129ff36ea2"
        },
        "user": {
            "$oid": "5f3fcbcae5efa018cc3c9b9d"
        },
        "text": "new bug"
    }

每个项目集合和bug元素都有自己的ID。我只想使用猫鼬从项目对象中的bug数组中检索一个bug元素。

每个项目对象都具有相似的结构。