具有app.use的multer配置返回TypeError [英] multer configuration with app.use returns TypeError

问题描述

我试图在我的app.js文件（使用node.js / express）中配置multer，以便允许用户上传图像。我在app.js中有以下代码：

I'm trying to configure multer in my app.js file (using node.js/express) in order to allow users to upload images. I have the following code in app.js:

//various require statements for passport, cookie parser, etc..

var multer = require('multer');

var app = express();

app.use(multer({dest:'./uploads/'}));

当我尝试运行应用程序时，我得到 TypeError：app.use ）需要中间件功能

When I try to run the app I get TypeError: app.use() requires middleware functions

我知道这个问题可能需要一些关于我的应用程序的上下文，所以请让我知道，如果其他信息是

I understand that this questions may require some more context with regards to my app so please let me know if additional information is needed.

谢谢

编辑：来自app.js的更多代码：

More code from app.js:

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var session = require('express-session');
//var fs = require('fs');
var multer = require('multer');

//Mongo Database
var mongo = require('mongodb');
var monk = require('monk');
var db = monk('localhost:27017/test-api');

//Instagram-API
var api = require('instagram-node').instagram();

//Cookie Manager
var cookieParser = require('cookie-parser');

//Grid
//var Grid = require('gridfs-stream');

//Passport
var passport = require('passport');
var InstagramStrategy = require('passport-instagram').Strategy;

var routes = require('./routes/index');
//var users = require('./routes/users');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(multer({dest:'./uploads/'}));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(methodOverride());
app.use(session({secret: 'keyboard cat', resave: false, saveUninitialized: true }));
app.use(passport.initialize());
app.use(passport.session());
app.use(express.static(path.join(__dirname, 'public')));


// Make our db accessible to our router
app.use(function(req,res,next){
    req.db = db;
    next();
});

app.use('/', routes);

推荐答案

问题是 multer {dest：'./ uploads /'}）返回对象，而不是中间件功能。如果我们看看代码模块，我们将看到有三个中间件功能：

Problem is that multer({dest:'./uploads/'}) return object, not middleware function. And if we look at the code module that we will see that there are three middlware functions:

multer({dest:'./uploads/'}).single(...)
multer({dest:'./uploads/'}).array(...)
multer({dest:'./uploads/'}).fields(...)

尝试其中一个。

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