Multer不接受数组格式的文件会出现“意外文件错误” [英] Multer not accepting files in array format gives 'Unexpected File Error'

问题描述

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。

Multer is a module used along with node js and express to upload files. I am using ng-file upload module on the angular side.

当我逐个发送多个文件时，它可以正常运行而没有任何错误，但是当我以阵列格式一次性发送所有文件然后我正在制作正如Multer的github所建议的那样，服务器端的必要更改仍然存在错误。

When I am sending multiple files one by one it works just fine without any errors whatsoever but when I am sending all files in one go in array format and then I am making necessary changes on the server side as suggested by Multer's github, still error comes.

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)

示例控制器代码

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，即为什么我在这里发帖。

Please tell me what I'm doing wrong. Google searches were not that useful, I have already tried that i.e.why I am posting here.

推荐答案

错误的原因是 multer 目前不支持 ng-file-upload 的数组语法默认使用 files [0] ， files [1] ， files [2] 等。 multer 期待一个相同字段名称的一系列文件。

The reason for the error is that multer currently does not support the array syntax that ng-file-upload uses by default which is files[0], files[1], files[2], etc. multer is expecting a series of files with the same field name.

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

The easiest solution is to set ng-file-upload's arrayKey option like so to avoid appending the [index] part:

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

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