尝试从函数返回字符串值并将其保存到 mongoDB 不起作用

Question

I am so frustrated. I have been trying to fix this nasty bug since yesterday but there is no progress. I wonder what am I doing wrong. This is what I want to do. After the user submits the form which has enctype of "multipart/form-data" I want to grab the image that he has uploaded, put that into my MinIO database ( really similar to AWS S3 ) and then generate a link that will be the user's profile link. The link generates properly but I can't find a method to save it to the Account.pictureUrl value. Your help will be highly appreciated. Thank you!

THE CODE HAS BEEN REMOVED DUE TO PRIVACY CONCERNS

Answer 1

It's not a bug. It's a feature. JavaScript IO is asynchronous. Your best bet is to make url return a promise, so you can take advantage of async/await . MinIOClient methods return a promise f no callback is passed, so use that.

// If a custom image was selected by the client set the picture URL to Firebase's  CDN
const url = async () => {
  // If the user has selected a file
  if (req.file) {
    // Upload user image to the database
    await MinIOClient.fPutObject("local", `${req.body.email}.png`, req.file.path, {
      "Content-Type": req.file.mimetype
    });

    // Getting the link for the object
    const presignedUrl = await MinIOClient.presignedGetObject("local", `${req.body.email}.png`, 24 * 60 * 60)
 

    return presignedUrl;
  }
  // If the user didn't select an image return a random image link(string) that will be used to serve default avatars from the server
  else {
    return avatarLinks[Math.floor(Math.random() * avatarLinks.length)];
  }
};

Then modify the controller

router.post("/", upload.single("avatar"), async (req, res) => {

    const pictureUrl = await url();

    let Account = new AccountSchema({
        // ... other values
        pictureUrl
    });
});