Question

我下载了一个json文件，并希望将其导入到mongodb中，但是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其他信息。每个对象的结构如下：

import java.util.Arrays;


import java.util.Scanner;

public class String2intArray {

public static void main(String[] args) {
    System.out.println(Arrays.toString(str2ia("6,8 ,9 , 10")));
    System.out.println(Arrays.toString(str2ia("1002")));
    System.out.println(Arrays.toString(str2ia("")));
    System.out.println(Arrays.toString(str2ia(", 2")));
    System.out.println(Arrays.toString(str2ia("Ett,Två")));
    System.out.println(Arrays.toString((str2ia("1,,2"))));
    System.out.println(Arrays.toString(str2ia("1 , 2 ,")));


}
public static int[] str2ia(String s) {
    int arraylengt = 0;
    int arrayindex = 0;
    Scanner scan = new Scanner(s).useDelimiter(" *, *");
    if(s.length() == 0)
    {
        int[] emptyArray = {};
        System.out.print("empty array ");
        return emptyArray;
    }
    while (scan.hasNext()) {
        if (scan.hasNextInt()) {
            int nextInt = scan.nextInt();

            arraylengt ++;
        } else {
            // discard next token
            scan.next();

        }
    }

     int[] intArray = new int[arraylengt];

    Scanner scan2 = new Scanner(s).useDelimiter(" *, *");
    try {
        while (scan2.hasNext()) {
            if (scan2.hasNextInt()) {
                intArray[arrayindex] = scan2.nextInt();
                arrayindex++;

            } else {
                // discard next token
                throw new IllegalArgumentException("Bad input");
            }

            }}
        catch (IllegalArgumentException e) {
            System.out.print("Bad input");
            int[] emptyArray = {};
            return emptyArray;

        }

    {

    return intArray;

           }

          }
             }

我为json属性创建模型或架构的目的是，如果稍后更改某些NAMES，我可以轻松地直接在模型中应用更改，而无需在我的javascript代码中。如果有人给我提示会很棒。谢谢

我的代码的一部分：

{
  "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"
        }
      ]
    }
  ]
}

嘿，我可以用以下类编写一个objectModel.js，但是我仍然很困惑如何为数组使用构造函数。在我的示例中this.signs？因为val.signs是一个符号数组。

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
        })

}

Answer 1

我终于解决了，通过signs数组的迭代应该像这样：

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一个模型

1 个答案: