GeoJSON数据保存，但查询时返回未定义

Question

我有以下模式

    var RaceSchema = new Schema({
    account: {
        _id: String,
    name: String,
    country: String
    },
    raceName:  String,
    raceStartTime: Date,
    timezone: Number,
    trackTimeStart: Date,
    trackTimeFinish: Date,
    sponserImageURL: Array,     
    map: {
        center: Array,
        course: Object,
        zoomLevel: Number
    },
    boats: [{
            _id: String,
            handicaps: [{                   
                                name: String,
                    division: Number,
                    rating: Number,
                    correctedTime: Number,
                    place: Number
                            }]
    }],
    dtg: Number,
    eta: Date,
    finishTime: Date,
    socialMedia: [{
                    name: String,
                    link: String
    }],
    createdAt: { type: Date, default: new Date },
    updatedAt: Date
}, {
    collection: 'race'
});

我用来存储GeoJson数据以及模式中看到的其他一些信息。我以以下格式保存数据(这是我在保存时从服务器获得的响应)

{
    "_id": "562bc48bfde8999f2995e61d",
    "raceStartTime": "2015-10-29T17:48:00.000Z",
    "trackTimeStart": "2015-10-24T17:48:00.000Z",
    "trackTimeFinish": "2015-10-24T17:48:00.000Z",
    "raceName": "Test ",
    "timezone": -4.5,
    "__v": 1,
    "updatedAt": "2015-10-24T17:49:16.912Z",
    "createdAt": "2015-10-24T17:39:45.587Z",
    "socialMedia": [],
    "boats": [{
        "_id": "55f6c2d39a2496d01d000002",
        "handicaps": []
    }],
    "map": {
        "center": [78.4651562, 17.4079808],
        "course": "{"type":"LineString","coordinates":[[8639830.18113004,2037505.4259696582],[8738281.073561348,1972075.3297575472],[8619650.805662755,1928659.0976915671],[8645333.647166574,1981859.2693780498],[8598248.437742906,2021606.5240863415]]}",
        "zoomLevel": 8
    },
    "sponserImageURL": [],
    "account": {
        "_id": "55a7c944d65763c23d11dd96",
        "name": "Huy Tran"
    },
    "id": "562bc48bfde8999f2995e61d"
}

我正在保存地图的数据。course作为一个对象，从我的模式中看到的格式与我从开放层api接收的格式相同。我猜这是导致我的findByIdAndRemove(id，回调);返回一个

TypeError: Cannot read property '562bc2b5fde8999f2995e61c' of undefined

如何解决这个问题，以便我可以执行其他操作，而不是保存这个模式

Answer 1

您似乎正在将map.course保存为String (JSON数据)，而不是Object。

如果是ol.format.GeoJSON创建的GeoJSON，考虑使用writeFeatureObject而不是writeFeature。它们返回相同的结果，但第一个是一个实际的JS对象，第二个是一个JSON字符串。