I am connecting to a mongodb collection named ‘Users’ which has the _id field. I am attempting to find and update an existing document in the database using mongodb findOneAndUpdate() method. To begin with i pass in the id as an argument to my function which works fine. The document does indeed update using the $set method but still outputs the resolve when it should catch the reject when there is no existing document.
How do i catch the error with a promise. I think the issue here is that i am not getting any response back from the mongodb api unless i pass it to a variable. However still knowing this, how do i catch the error when there is no existing document that does not match the query?
Heres my code:
let findOneAndUpdate = ( (id) => {
return new Promise( (resolve, reject) => {
if(id){
db.collection('Users').findOneAndUpdate({_id: new ObjectID(id)}, {
$set: {
name: 'Andrea',
age: 1,
location: 'Andromeda'
}
}
);
resolve('Document matching the _id has been successfully updated.')
}else{
reject(new Error('Unable to find the _id matching your query'));
}
});
});
To pass in an id and to call my promise
const find = findOneAndUpdate(‘id goes here’);
find.then(
success => console.log(success),
).catch(
reason => console.log(reason)
)
Appreciate any help, thanks in advance !
Answer
You need to specify a callback in mongodb’s findOneAndUpdate.
https://github.com/mongodb/node-mongodb-native#user-content-update-a-document
let findOneAndUpdate = (id) => {
return new Promise((resolve, reject) => {
if (!id) {
reject(new Error('No id specified'));
}
db.collection('Users').findOneAndUpdate({
_id: new ObjectID(id)
}, {
$set: {
name: 'Andrea',
age: 1,
location: 'Andromeda'
}
}, function(err, result) {
if (err) {
return reject(err);
}
resolve('Document matching the _id has been successfully updated.');
})
});
};