Sails.JS文件上传-无法在req.file()上获取文件

我刚开始使用Sails.JS,我尝试上传一个简单的文件.在Sails.JS中,我做到了这一点:

uploadFile: (req, res) => {
		req.file('avatar').upload({
			dirname: '../../assets/uploads'
		}, function (err, uploadedFiles){
			if (err) return res.serverError(err);
			return res.json({
				message: uploadedFiles.length + ' file(s) uploaded successfully!',
				files: uploadedFiles
			});
		});
	}