TypeError：任务不是asynchronousjs平行的函数
我试图上传一个图像，并使用下面的代码更新数据库集合中的图像的url。
Controller.prototype.handle = function (req, res, next) { var id = req.params.id, controller = req.params.controller, optionalController; optionalController = _.clone(controller); // handle optional controller if (controller === 'newboat') { controller = 'boat'; } else if (controller === 'newcrew') { controller = 'crew'; } var files = req.files.files || {}, monthYear = new Date(), monthYear = [monthYear.getFullYear(), monthYear.getMonth()], filename = files[0].originalFilename, path = files[0].path, extension = filename.match(EXPRESSION_EXTENSION)[1], destFolder = [ROOT, monthYear[0], '/', monthYear[1] ].join(''), destination = [ROOT, monthYear[0], '/', monthYear[1] ,'/', id, '.', extension ].join(''); // log info //console.log(id, controller, filename, extension, destination, path); var opts = JSON.stringify({id: id, photo: ['/uploads/',monthYear[0], '/', monthYear[1] ,'/', id, '.', extension ].join('') }); async.series([ uploadImage(path,destFolder,destination), ProcessUpload(optionalController, opts, res) ]); }; // write file var uploadImage = function(path,destFolder, destination) { // The land of callbacks ------>>>>>> inception within inception mkdirp(destFolder,777,function (err) { fs.readFile(path, function (err, data) { fs.writeFile(destination, data, function (err) { if (err) { console.log('image not uploaded..'); return false; }else { return true; } }); }); }); }; var ProcessUpload = function(optionalController, opts, res ) { opts = JSON.parse(opts); if (optionalController === 'boat') { updateBoatDatabase(opts); } }; /** * Update boat photo to database */ var updateBoatDatabase = function (opts, callback) { // save to database return dbServices.dbBoat.updatePhoto(opts, callback); }; 这是正在调用的数据库服务
/** * Update image */ updatePhoto: function (opts, callback) { var id = opts.id; // find boat by id this.modelClass.findById(id, function (err, model) { if (err || !model) return callback(err); // set update value model.photo = opts.photo; // save model.save(callback); }); },
在上传图像时出现以下错误，但是图像上传到服务器上，并且在数据库集合上更新了其URL。 我假设它与我的callback有关，但我不确定我的错在哪里。 任何提示如何debugging这将不胜感激。
TypeError: task is not a function at /home/work/bluewatertracks/node_modules/async/lib/async.js:689:13 at iterate (/home/work/bluewatertracks/node_modules/async/lib/async.js:265:13) at async.forEachOfSeries.async.eachOfSeries (/home/work/bluewatertracks/node_modules/async/lib/async.js:284:9) at _parallel (/home/work/bluewatertracks/node_modules/async/lib/async.js:688:9) at Object.async.series (/home/work/bluewatertracks/node_modules/async/lib/async.js:710:9) at Controller.handle (/home/work/bluewatertracks/server/routers/photoUploader.js:56:9) at Layer.handle [as handle_request] (/home/work/bluewatertracks/node_modules/express/lib/router/layer.js:82:5) at next (/home/work/bluewatertracks/node_modules/express/lib/router/route.js:110:13) at Form.<anonymous> (/home/work/bluewatertracks/node_modules/connect-multiparty/index.js:101:9) at emitNone (events.js:72:20) at Form.emit (events.js:166:7) at maybeClose (/home/work/bluewatertracks/node_modules/connect-multiparty/node_modules/multiparty/index.js:557:10) at endFlush (/home/work/bluewatertracks/node_modules/connect-multiparty/node_modules/multiparty/index.js:552:3) at WriteStream.<anonymous> (/home/work/bluewatertracks/node_modules/connect-multiparty/node_modules/multiparty/index.js:617:5) at emitNone (events.js:72:20) at WriteStream.emit (events.js:166:7)
你也可以通过传递一个空对象bind()来简化这一点：
async.series( [ uploadImage.bind( null, path, destFolder, destination ), ProcessUpload.bind( null, optionalController, opts, res ) ] );
async.series和大多数的async控制stream函数期望函数或函数数组返回，例如
async.series([ function () {}, function () {} ])
你的两个函数调用 uploadImage和ProcessUpload的返回值不是函数。 async错误。
相反，你将不得不把它写成这样的：
async.series([ function (callback) { // callback has to be called by `uploadImage` when it's done uploadImage(path,destFolder,destination, callback); }, ]);