为 json 对象的属性名称创建模型

Question

我下载了一个 json 文件并想将其导入到 mongodb，但在将其导入数据库之前，我想在 node.js 中编写代码以重组 json 对象并向每个对象添加一些附加信息。每个对象的结构如下所示：

{
  "fid": "52955",
  "geometry": {
    "type": "LineString",
    "coordinates": [
      [
        -76.9812226935329,
        38.9032437788008
      ],
      [
        -76.9811595039813,
        38.9033432081856
      ]
    ]
  },
  "signs": [
    {
      "MANUAL_SEGID": null,
      "OBJECTID": "125463",
      "GLOBALID": "{0F7DB59B-948D-42DB-90EF-3F17D391B8BB}",
      "SIGNARROWDIRECTION": "2",
      "MUTCD": "R-DC-Loading_Zone_With_ParkMobile_Zone",
      "intervalInfo": [
        {
          "RESTRICTIONSTATUS": "3",
          "OBJECTID": "41460"
        }
      ]
    },
    {
      "MANUAL_SEGID": null,
      "OBJECTID": "125465",
      "GLOBALID": "{079902E8-D9B0-462B-9323-1550B4FE7197}",
      "SIGNARROWDIRECTION": "2",
      "MUTCD": "R-DC-2HR",
      "intervalInfo": [
        {
          "RESTRICTIONSTATUS": "1",
          "OBJECTID": "41462"
        }
      ]
    }
  ]
}

我为 json 属性创建模型或架构的目的是，如果稍后更改了一些名称，我可以轻松地直接在模型中应用更改，而不是在我的 javascript 代码中. 如果有人给我提示，那就太好了。谢谢

我的部分代码：

const filesArray = [ "permitZone.geojson"]; //Array of files in manual folder
const dataInfo = {
    description: 'Zone',
    data: [
        {
            url: 'https://opendata.arcgis.com/datasets/fcfbf29074e549d8aff9b9c708179291_1.geojson',
            type: 'permitZone.geojson'
        }
    ]
};
function dataReader() {
    var allResult = [];

    var arrayFilePromises = filesArray.map(function (fileName, index) {
        return downloadFile(dataInfo.data[index].url, dataDownloadPath, fileName)
            .then((fileRes) => {
                fileRes.features.forEach(function (val) {
                   
                    // Here i need to read each object and apply some changes

                });
            })
    })

    return Promise.all([Promise.all(arrayFilePromises)])
        .then(() => {
            return allResult
        })

}

嘿，我可以用下面的类写一个 objectModel.js，但我仍然很困惑如何为数组使用构造函数。在我的例子中 this.signs?因为val.signs是一个符号数组。

class Sign {
    constructor(signData) {
        this.objectId = signData.OBJECTID;
        this.global = signData.GLOBALID;
        this.manualSegId = signData.MANUAL_SEGID;
        this.signarrowDirection = signData.SIGNARROWDIRECTION;
    }
}
class MyCity {
    constructor(val) {
        this.fid = val.fid;
        this.lineId = val.lineId;
        this.segId = val.segId;
        this.geometry = val.geometry;
        this.signs = new Sign(val.signs);
    }

}


module.exports = {
    MyCity: MyCity
}

Answer 1

我终于解决了，通过 signs 数组的迭代应该是这样的：

class Sign {
    constructor(signData) {
        this.objectId = signData.OBJECTID;
        this.global = signData.GLOBALID;
        this.manualSegId = signData.MANUAL_SEGID;
        this.signarrowDirection = signData.SIGNARROWDIRECTION;
    }
}

class MyCity {
    constructor(val) {
        this.fid = val.fid;
        this.lineId = val.lineId;
        this.segId = val.segId;
        this.geometry = val.geometry;
        this.signs = val.signs.map(signData => new Sign(signData))
    }

}


module.exports = {
    MyCity: MyCity
}

为 json 对象的属性名称创建模型

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