Destination not being set while uploading files using multer and gcloud - node.js

Question

I am trying to upload files in a specific folder in my google storage bucket. I wrote my code using Google documentations
app.js
const multerMid = multer({
storage: multer.memoryStorage(),
limits: {
// no larger than 5mb.
fileSize: 5 * 1024 * 1024,
},
});
app.disable("x-powered-by");
app.use(
multerMid.fields([
{ name: "avatar", maxCount: 1 },
{ name: "gallery", maxCount: 8 },
])
);
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.post("/uploads", async (req, res, next) => {
try {
const myFile = req.files;
console.log(myFile);
const imageUrl = await uploadImage(myFile.gallery[0]);
res.status(200).json({
message: "Upload was successful",
data: imageUrl,
});
} catch (error) {
next(error);
}
});
uploadimage function
const uploadImage = (file) =>
new Promise((resolve, reject) => {
const { originalname, buffer } = file;
const blob = bucket.file(originalname.replace(/\s+/g, "_"));
const blobStream = blob.createWriteStream({
destination: "documents/image.png",
resumable: false,
});
blobStream
.on("finish", () => {
const publicUrl = `https://storage.googleapis.com/${bucket.name}/${blob.name}`;
resolve(publicUrl);
})
.on("error", () => {
reject(`Unable to upload image, something went wrong`);
})
.end(buffer);
});
Here, i am setting the destination as documents/image.png but the file is still storing in the bucket root and not in the documents folder. How can i make the files get stored in a specific folder in bucket?

Answer 1

createWriteStream has no property named destination on its configuration option!
https://googleapis.dev/nodejs/storage/latest/global.html#CreateWriteStreamOptions
There is the uploadOptions object:
https://googleapis.dev/nodejs/storage/latest/global.html#UploadOptions
Solution: You should use upload convenience method (which wraps createWriteStream) and pass the uploadOptions object to it which as a destionation property!
https://googleapis.dev/nodejs/storage/latest/Bucket.html#upload

Answer 2

I have figured out the way to store a file in a particular subdirectory in google storage bucket.Google stores a file in its bucket with a name which contains it path too. For eg, if an image name xyz.jpg is store in abc folder in mnp bucket. The filename will be mnp/abc/xyz.jpg. So, to save a file in a particular directory, we just have to add the path in the original file name.
const uploadImage = (file) =>
new Promise((resolve, reject) => {
const { originalname, buffer } = file;
const blob =
bucket.file(originalname.replace(originalname,"document/"+originalname));
const blobStream = blob.createWriteStream({
resumable: false,
});
blobStream
.on("finish", () => {
const publicUrl = `https://storage.googleapis.com/${bucket.name}/${blob.name}`;
resolve(publicUrl);
})
.on("error", () => {
reject(`Unable to upload image, something went wrong`);
})
.end(buffer);
});