Multer不接受数组格式的文件会出现"意外文件错误"

Question

Multer是一个与节点js一起使用的模块,表示上传文件.我在角度侧使用ng-file上传模块.

当我逐个发送多个文件时它工作正常没有任何错误但是当我以数组格式一次性发送所有文件然后我按照Multer的github建议在服务器端进行必要的更改时,仍然出现错误.

这是错误

Error: Unexpected field
    at makeError (C:\nodefiles\new\node_modules\multer\lib\make-error.js:12:13)
    at wrappedFileFilter (C:\nodefiles\new\node_modules\multer\index.js:39:19)
    at Busboy.<anonymous> (C:\nodefiles\new\node_modules\multer\lib\make-middleware.js:109:7)
    at Busboy.emit (events.js:118:17)
    at Busboy.emit (C:\nodefiles\new\node_modules\multer\node_modules\busboy\lib\main.js:31:35)
    at PartStream.<anonymous> (C:\nodefiles\new\node_modules\multer\node_modules\busboy\lib\types\multipart.js:209:13)
    at PartStream.emit (events.js:107:17)
    at HeaderParser.<anonymous> (C:\nodefiles\new\node_modules\multer\node_modules\busboy\node_modules\dicer\lib\Dicer.js:51:16)
    at HeaderParser.emit (events.js:107:17)
    at HeaderParser._finish (C:\nodefiles\new\node_modules\multer\node_modules\busboy\node_modules\dicer\lib\HeaderParser.js:70:8)
    at SBMH.<anonymous> (C:\nodefiles\new\node_modules\multer\node_modules\busboy\node_modules\dicer\lib\HeaderParser.js:42:12)
    at SBMH.emit (events.js:118:17)
    at SBMH._sbmh_feed (C:\nodefiles\new\node_modules\multer\node_modules\busboy\node_modules\dicer\node_modules\streamsearch\lib\sbmh.js:159:14)
    at SBMH.push (C:\nodefiles\new\node_modules\multer\node_modules\busboy\node_modules\dicer\node_modules\streamsearch\lib\sbmh.js:56:14)
    at HeaderParser.push (C:\nodefiles\new\node_modules\multer\node_modules\busboy\node_modules\dicer\lib\HeaderParser.js:48:19)
    at Dicer._oninfo (C:\nodefiles\new\node_modules\multer\node_modules\busboy\node_modules\dicer\lib\Dicer.js:198:25)

样本控制器代码

var app = angular.module('fileUpload', ['ngFileUpload']);

app.controller('MyCtrl', ['$scope', 'Upload', '$timeout', function ($scope, Upload, $timeout) {
    $scope.uploadFiles = function (files) {
        $scope.files = files;
        if (files && files.length) {
            console.log(files);
            Upload.upload({
                url: '/api/data/addtweet',
                data: {
                    files: files
                }
            }).then(function (response) {
                $timeout(function () {
                    $scope.result = response.data;
                });
            }, function (response) {
                if (response.status > 0) {
                    $scope.errorMsg = response.status + ': ' + response.data;
                }
            }, function (evt) {
                $scope.progress =
                    Math.min(100, parseInt(100.0 * evt.loaded / evt.total));
            });
        }
    };
}]);

请告诉我我做错了什么.谷歌搜索没有那么有用,我已经尝试过,我在这里发帖.

Answer 1

究其原因,错误的是,multer目前不支持数组要ng-file-upload在默认情况下是使用files[0],files[1],files[2]等multer期待了一系列的文件相同的字段名称.

最简单的解决方案是设置这样ng-file-upload的arrayKey选项,以避免附加[index]部分:

Upload.upload({
  url: '/api/data/addtweet',
  arrayKey: '', // default is '[i]'
  data: {
    files: files
  }
})