如何在featherjs中处理文件上传？

Question

我正在尝试使用multer处理feathersjs中的多部分表单文件上传，我尝试使用req.picture和blobService将blobStorage中包含的文件复制到服务器并获取该文件的URL，然后用返回的url替换req.picture。之后req应该移交给feathers-mongoose以保留在数据库中。通过官方文档https://docs.feathersjs.com/guides/advanced/file-uploading.html我已经提出了以下内容，但我无处可去。

物品服务|此外，只有当我将blobService({ Model: blobStorage})更改为createService(options)时，其他方法（如get）才会生效，否则不会。

    // Initializes the `items` service on path `/items`
const createService = require('feathers-mongoose');
const createModel = require('../../models/items.model');
const hooks = require('./items.hooks');
const filters = require('./items.filters');
const multer = require('multer');
const multipartMiddleware = multer();
const blobService = require("feathers-blob");
const fs = require("fs-blob-store");
const blobStorage = fs("./public/items/pictures");

module.exports = function () {
  const app = this;
  const Model = createModel(app);
  const paginate = app.get('paginate');

  const options = {
    name: 'items',
    Model,
    paginate
  };

  // Initialize our service with any options it requires
  app.use('/items',
    multipartMiddleware.single('picture'),
    function(req, res, next){
      req.feathers.file = req.picture;
      req.picture = 'url to the file';
      next();
    },
    blobService({ Model: blobStorage}));

  // Get our initialized service so that we can register hooks and filters
  const service = app.service('items');

  service.hooks(hooks);

  if (service.filter) {
    service.filter(filters);
  }
};

项目服务挂钩

const { authenticate } = require('feathers-authentication').hooks;
const fileUpload = require('../../hooks/file-upload').hooks;

module.exports = {
  before: {
    all: [ authenticate('jwt') ],
    find: [],
    get: [],
    create: [fileUpload],
    update: [fileUpload],
    patch: [],
    remove: []
  },

Hook for file upload（file-upload.js）

const dauria = require('dauria');
module.exports = {
  hooks: function(hook) {
    if (!hook.data.uri && hook.params.file){
      const file = hook.params.file;
      const uri = dauria.getBase64DataURI(file.buffer, file.mimetype);
      hook.data = {uri: uri};
    }
  }
}

这是我对邮递员的反应

    {
    "name": "GeneralError",
    "message": "Cannot read property 'startsWith' of undefined",
    "code": 500,
    "className": "general-error",
    "data": {},
    "errors": {}
}