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为JSON对象的属性名称创建一个模型

jsonschema schema node.js javascript

Maryam Koulaei · 技术社区 · 6 年前

我下载了一个JSON文件并想将其导入MongoDB,但是在将其导入数据库之前,我想在node.js中编写一个代码来重新构造JSON对象并向每个对象添加一些额外的信息。每个对象的结构如下:

{
  "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属性创建模型或模式的目的是,如果稍后更改了某些名称,我可以很容易地直接应用模型中的更改,而不是在我的javascript代码中。如果有人给我一个提示,那就太好了。谢谢

我的代码的一部分:

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,我可以用下面的类编写一个objectmodel.js,但是我仍然不清楚如何使用数组的构造函数。在我的例子中,这个符号?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
}

1 回复 | 直到 6 年前

Maryam Koulaei 6 年前

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
}