Question

我有一个允许csv文件上传的应用程序，通过csvtojson将csv转换为json，然后通过mongoose将json导入mongo db。

绝大多数都可以，但由于某些原因，我无法获得导入脚本来动态获取新生成的json，但是我很好地将其硬编码到json的路径。

我有一个看起来像这样的转换脚本，似乎正在正确地执行它（即在上传文件时调用它，将csv转换为json然后删除上传的csv）

var convertJSON = function convertJSON(inputFile, callback) {


var fs = require('fs');
const csv=require('csvtojson');
console.log('NOW I AM IN convertJSONOriginal');

const converter=csv({
    noheader:true,
    headers: ['date','vendor','amount'],
    trim:false
})
    .fromFile('./data/' + inputFile,function(err,result){
        // if an error has occured then handle it
        if(err){
            console.log("An Error Has Occurred");
            console.log(err);
        }
        // create a variable called json and store
        // the result of the conversion

        //var json = result;
        var json = JSON.stringify(result);

        fs.writeFile('./data/' + inputFile.split('.')[0] + '.json', json, function(err) {
            if(err) {
                return console.log(err);
            }

            console.log("The file was saved!");
            //TODO delete the imported csv file
            fs.unlink("./data/" + inputFile, function (err) {
                if (err) {
                    console.log("failed to delete local file:"+err);
                } else {
                    console.log('successfully deleted local file');
                }
            });
            var jsonFile = inputFile.split('.')[0] + '.json' ;
            console.log('THIS IS jsonfile AS IT COMES FROM convertJSONOriginal' +jsonFile);
            callback(err,jsonFile);
        });

    });
};


module.exports = {
convertJSON: convertJSON
};

我有一个调用此函数的upload.js路由

var express = require("express");
var multer = require('multer');
var router = express.Router();
var path = require('path');
var runScript = require('../helpers/runScript');
var convertJSON = require('../helpers/convertJSONOriginal');
var upload = require('../helpers/statement-seeder');

/*
  The below hardcoded path will allow the call to console.log('AND THIS 
 WITH statements '+JSON.stringify(statements));
  to print out an object
*/

 var statements= require("../data/HSBC-1493565387017.json");

var storage = multer.diskStorage({
  destination: function(req, file, callback) {
      callback(null, './data')
  },
  filename: function(req, file, callback) {
    callback(null, req.body.bank + '-' + Date.now() + 
path.extname(file.originalname))

  }
});


router.post('/',
  multer({
      storage: storage,
      fileFilter: function(req, file, callback) {
          var ext = path.extname(file.originalname)
          if (ext !== '.csv') {
              return callback(res.end('Only csvs are allowed'), null)
          }
          callback(null, true)
      }
  })
      .single('statement'), //this is the name of the form field to get the file from
function(req, res) {
    console.log('THIS IS THE FILENAME - '+req.file.filename);
    convertJSON.convertJSON(req.file.filename, function(err, filename){
        if (err){
            console.log(err);
        } else {
            //prints out AND THIS WITH ../data "../data/HSBC-1493565431073.json" to console

console.log('THIS IS WITH ../data '+JSON.stringify('../data/'+filename));
            //prints out AND THIS WITH data "/data/HSBC-1493565431073.json" to console

 console.log('AND THIS WITH /data '+JSON.stringify('/data/'+filename));
            //prints out AND THIS WITH ./data "./data/HSBC-1493565431073.json" to console

 console.log('AND THIS WITH ./data '+JSON.stringify('./data/'+filename));
            //prints out the json object to console

 console.log('AND THIS WITH statements '+JSON.stringify(statements));
            //upload.statementSeeder(filename);
            //upload.statementSeeder(statements);

        }
    });

});

module.exports = router;

基本上，如果我是＆＃39; console.log（陈述）＆＃39;从硬编码var statements= require("../data/HSBC-1493565387017.json");（其中../data/HSBC-1493565387017.json是一个已经通过我编写的代码上传和转换的文件）然后我看到完整的json对象，但是如果我是console.log从给予回调的值开始，它只打印文件的路径。

谁能告诉我我做错了什么？

编辑回答问题：查看filename的typeof（从JSON转换脚本返回req.file.filename，如果我的思维/代码正确，则上传的每个文件都不同） console.log('HERE IS THE TYPEOF for filename'+ typeof filename);返回string。但是console.log('HERE IS THE TYPEOF for statement'+ typeof statements);其中statements被硬编码到转换后的json文件var statements= require("../data/HSBC-1493565387017.json");的实际位置，返回object。

Answer 1

好的，我已将下面的内容添加到convertjson脚本中，该脚本现在将打开的json文件作为对象传递给回调

 var obj;
 fs.readFile('./data/' + inputFile.split('.')[0] + '.json', 'utf8', 
     function (err, data) {
       if (err) throw err;
         obj = JSON.parse(data);
                //console.log(obj);
                callback(err,obj);
       });

JSON对象未传递给函数

1 个答案: