How to get files uploaded via multer using mongoose? - node.js

Question

I'm using the below function to get the files uploaded by multer in mongodb.The request is returning empty array.
exports.getPhotos = async (req, res) => {
const photos = await Photo.find()
.then(photos => {
res.status(200).json(photos);
})
.catch(err => res.status(500).json({message: "Something went wrong"}));
};
and this is the schema of the image. Is there any way to get the files without specifying the schema?
const mongoose = require("mongoose");
const {ObjectId} = mongoose.Schema;
const photoSchema = new mongoose.Schema({
lenght: {
type: String,
},
chunkSize: {
type: String,
required: true
},
uploadDate: {
type: Date,
},
filename: {
type: String,
},
md5: {
type: String,
},
contentType: {
type: String,
},
});
module.exports = mongoose.model("Photo", photoSchema);

Answer 1

i use gridfs so it could upload larger files too . a piece of sample code below
//Connecting to mongo
const conn = mongoose.createConnection(mongoURI);
//Init gfs
let gfs;
conn.once('open', ()=>{
gfs = GridFsStream(conn.db, mongoose.mongo);
gfs.collection('uploads');
})
//Creating Storage engine
const storage = new GridFsStorage({
url:mongoURI,
file: (req, file) => {
return new Promise((resolve, reject)=>{
crypto.randomBytes(16,(err, buf)=>{
if(err){
return reject(err)
}
const fileName = buf.toString('hex') + path.extname(file.originalname)
//bucket name should match the collection name
const fileInfo = {
filename:fileName,
bucketName:'uploads'
}
resolve(fileInfo);
})
})
}
})
const upload = multer({storage})
now use this upload const in your paths like the one below there are a few methods for upload like array , single and ... depends on number of files you are uploading . the 'uploadedFile' argument is the name of the file input and you should be consider setting it in your frontend.
app.post('/',upload.single('uploadedFile'),(req, res)=>{
res.json('file uploaded')
})
this upload middleware adds a files to your request which you can use to put file names in your database and later fetch it by that uniqe names with a route like the one below .
app.get('/:filename', (req, res)=>{
gfs.files.findOne({filename:req.params.filename},(err,file)=>{
if(!file || file.length === 0){
return res.status(404).json({
err:'No file Exists'
})
}
const readStream = gfs.createReadStream(file.filename);
readStream.pipe(res)
})
})