如何将多个文件上载到谷歌云存储+；Node.js？

我在Node.JS后端工作，我基本上需要做以下基本工作：

将多个文件保存到Google云存储

将GCS公共URL数组保存到MongoDB

将“post”数据与公共URL数组一起保存到Mongo DB

这是我的密码。最后它工作了，保存了Mongo DB中的所有东西，但看起来很混乱。如何修复这些代码行

model/Post.js：

const mongoose = require('mongoose');
const {Schema} = mongoose;

const postSchema = new Schema({
  title: {type: String},
  subtitle: {type: String},
  description: {type: String},
  imagesUrl: [{type: String}],
  _user: {
    type: Schema.Types.ObjectId,
    ref: 'User',
  },
});

const Post = mongoose.model('Post', postSchema, 'posts');

module.exports = {
  Post,
};

控制器/postController.js

const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
const bucket = storage.bucket(process.env.GCLOUD_STORAGE_BUCKET);

//Func to save data into Mongo DB
const createPost = async (data) => {
  try {
    const post = await new Post({
      title: data.title,
      subtitle: data.subtitle,
      description: data.description,
      _user: data.userId,
    });

    await _.map(data.imagesUrl, (value, key) => {
      post.imagesUrl.push(value);
    });

    post.save();

    const userById = await User.findOne({_id: data.userId});
    userById._posts.push(post);
    await userById.save();

    return post;
  } catch (e) {
    return e.stack;
  }
};

//Func to upload files to GCS
const uploadFileTGcs = async (file) => {
  let promises = [];
  _.forEach(file, (value, key) => {
    const {originalname, buffer} = value;
    const blob = bucket.file(originalname.replace(/ /g, '_'));

    const promise = new Promise((resolve, reject) => {
      const blobStream = blob.createWriteStream({
        resumable: false,
        public: true,
      });
      blobStream.on('error', () => {
        reject(`Unable to upload image, something went wrong`);
      }).on('finish', async () => {
        const publicUrl = format(
            `https://storage.googleapis.com/${bucket.name}/${blob.name}`,
        );
        resolve(publicUrl);
      }).end(buffer);
    });
    promises.push(promise);
  });
  const urls = Promise.all(promises).then(promises => {
    return promises;
  });

  return urls;
};

routes/postRoute.js

router.post('/create', async (req, res, next) => {
  try {
    if (!req.files) {
      res.status(400).json({
        messages: 'No file uploaded',
      });
      return;
    }

    const imagesUrl = await postsController.uploadFileTGcs(req.files);

    const postCreated = await postsController.createPost({
      title: req.body.title,
      subtitle: req.body.subtitle,
      description: req.body.description,
      imagesUrl: imagesUrl,
      userId: req.user._id, 
    });

    res.status(postCreated ? 200 : 404).json({
      result: postCreated,
      message: 'Post created',
    });
  } catch (e) {
    res.status(500).json({
      result: e.toString(),
    });
  }
});