有没有办法将文件上传与Loopback3中的特定模型关联起来？

npm install loopback-component-storage --save

{
  "storage": {
    "name": "storage",
    "connector": "loopback-component-storage",
    "provider": "filesystem",
    "root": "./server/storage"
  }
}

{
  "File": {
    "dataSource": "storage",
    "public": true
  }
}

module.exports = function(File) {
  File.upload = function(ctx, options, cb) {
    if (!options) options = {};
    ctx.req.params.container = 'storage';
    File.app.models.storage.upload(ctx.req, ctx.result, options, function(err, fileObj) {
      if (err) {
        cb(err);
      } else {
        var fileInfo = fileObj.files.file[0];
        File.create({
          name: fileInfo.name,
          type: fileInfo.type,
          container: fileInfo.container,
          url: '/api/containers/' + fileInfo.container + '/download/' + fileInfo.name
        }, function(err, file) {
          if (err) {
            cb(err);
          } else {
            cb(null, file);
          }
        });
      }
    });
  };

  File.remoteMethod('upload', {
    description: 'Uploads a file',
    accepts: [
      { arg: 'ctx', type: 'object', http: { source: 'context' } },
      { arg: 'options', type: 'object', http: { source: 'query' } }
    ],
    returns: { arg: 'file', type: 'object', root: true },
    http: { verb: 'post', path: '/upload' }
  });
};

var loopback = require('loopback');
var boot = require('loopback-boot');

var app = module.exports = loopback();

app.start = function() {
  // start the web server
  return app.listen(function() {
    app.emit('started');
    var baseUrl = app.get('url').replace(/\/$/, '');
    console.log('Web server listening at: %s', baseUrl);
    if (app.get('loopback-component-explorer')) {
      var explorerPath = app.get('loopback-component-explorer').mountPath;
      console.log('Browse your REST API at %s%s', baseUrl, explorerPath);
    }
  });
};

boot(app, __dirname, function(err) {
  if (err) throw err;

  // start the server if `$ node server.js`
  if (require.main === module)
    app.start();
});