How to store downloaded file local url in mongodb - mongodb

Question

i want to store the url path of downloaded file in mongodb so i can later use the path to open the file in my app.
i tried to store but the problem is whenever i download new file it upadate with the previous one .
this is the backend code
router.post('/download',function (req, res) {
console.log(req.body)
User.updateOne({_id:req.body.userid},{$set:{downloadurl:req.body.downloadurl
}}).then((user)=>{
console.log(user);
res.status(200).send({
data:user,
message:'success'
})
}).catch((err)=>{
console.log(err)
res.status(500).send({
data:err,
message:'not success'
})
})
});
this is the backend of ui
export async function DownloadUrl(data) {
let result = await fetch(url + 'user/download', {
method: 'POST',
body: JSON.stringify(data),
headers: {
Accept: 'application/json',
'Content-Type': 'application/json',
}
}).then(response => response.json());
console.log(result);
return result;
}

Answer 1

The problem here is that your urls are being stored in a plain text field. You need to store them in an array and, instead of using $set, that will overwrite the previous data, start using $push, that will append data to your url array:
router.post('/download',function (req, res) {
console.log(req.body)
User.updateOne(
{_id:req.body.userid},
{$push:{download_urls:req.body.downloadurl}}
).then((user)=>{
console.log(user);
res.status(200).send({
data:user,
message:'success'
})
}).catch((err)=>{
console.log(err)
res.status(500).send({
data:err,
message:'not success'
})
})
});
This way, you will end up with a User document like the one below:
{
"_id": "some_id_value",
// [...]
"dowload_urls": [
"someurl1",
"someurl2",
"someurl3"
]
}