如何从loopback 4上传到MongoDB GridFS

{
  "name": "mongodb",
  "connector": "mongodb",
  "url": "mongodb://localhost:27017/mydatabase"
}

lb4 model

import {StorageComponent} from 'loopback-component-storage';

export const storageOptions = {
  name: 'storage',
  connector: 'loopback-component-storage',
  provider: 'filesystem',
  root: './storage'
};

export class StorageComponentApplication extends BootMixin(
  ServiceMixin(RepositoryMixin(RestApplication)),
) {
  constructor(options: ApplicationConfig = {}) {
    super(options);

    // 添加存储组件
    this.component(StorageComponent);
    this.configure('storage', storageOptions);
  }
}

import {inject} from '@loopback/core';
import {FileUploadHandler} from 'loopback-component-storage';

export class MyController {
  constructor(
    @inject('storage.fileUploadHandler') private handler: FileUploadHandler,
  ) {}

  async uploadFile(request: Request, response: Response) {
    const result = await this.handler.upload(request, response);
    // 处理上传结果
  }
}

import {inject} from '@loopback/core';
import {GridFSConnector} from '@loopback/mongodb';

export class MyController {
  constructor(
    @inject('datasources.mongodb') private dataSource: juggler.DataSource,
  ) {}

  async uploadFile(request: Request, response: Response) {
    const result = await this.handler.upload(request, response);
    const connector = new GridFSConnector(this.dataSource);
    const fileId = await connector.upload(result.files[0]);
    // 处理文件ID
  }
}