Error Handling mongoose with forEach loop
I have a mongodb with express and I'm getting Cannot set headers after they are sent to the client. Unhandled promise rejections are deprecated
error when doing the following.
exports.deleteBooking = (req, res, next) => {
req.body.courts.forEach(element => {
Booking.deleteOne({$and: [
{ cid: element.cid },
{ year: element.day.year }
]})
.then(result => {
res.status(201).json({
message: result
});
})
.catch(() => {
res.status(500).json({
error: 'error'
})
});
})
};
I am sending an array of objects to my server and want to perform one deletion per object.
Because of the forEach
it might run the .catch after the headers are sent to the client. What is the correct way of handling .then
and .catch
with a forEach loop?
Thank you!
EDIT: I forgot to add that if I would delete the .then
and .catch
the query would still run, and without errors. But I would like to keep the error handling in this case.
node.js mongodb mongodb-query
add a comment |
I have a mongodb with express and I'm getting Cannot set headers after they are sent to the client. Unhandled promise rejections are deprecated
error when doing the following.
exports.deleteBooking = (req, res, next) => {
req.body.courts.forEach(element => {
Booking.deleteOne({$and: [
{ cid: element.cid },
{ year: element.day.year }
]})
.then(result => {
res.status(201).json({
message: result
});
})
.catch(() => {
res.status(500).json({
error: 'error'
})
});
})
};
I am sending an array of objects to my server and want to perform one deletion per object.
Because of the forEach
it might run the .catch after the headers are sent to the client. What is the correct way of handling .then
and .catch
with a forEach loop?
Thank you!
EDIT: I forgot to add that if I would delete the .then
and .catch
the query would still run, and without errors. But I would like to keep the error handling in this case.
node.js mongodb mongodb-query
Should the response, whether it is error or message be send after the entire forEach loop is done or for each item in the loop?
– Jeevan
Nov 22 at 14:57
So I tried this but then it gives the errorCannot read property 'then' of undefined
– Devchris
Nov 22 at 15:17
add a comment |
I have a mongodb with express and I'm getting Cannot set headers after they are sent to the client. Unhandled promise rejections are deprecated
error when doing the following.
exports.deleteBooking = (req, res, next) => {
req.body.courts.forEach(element => {
Booking.deleteOne({$and: [
{ cid: element.cid },
{ year: element.day.year }
]})
.then(result => {
res.status(201).json({
message: result
});
})
.catch(() => {
res.status(500).json({
error: 'error'
})
});
})
};
I am sending an array of objects to my server and want to perform one deletion per object.
Because of the forEach
it might run the .catch after the headers are sent to the client. What is the correct way of handling .then
and .catch
with a forEach loop?
Thank you!
EDIT: I forgot to add that if I would delete the .then
and .catch
the query would still run, and without errors. But I would like to keep the error handling in this case.
node.js mongodb mongodb-query
I have a mongodb with express and I'm getting Cannot set headers after they are sent to the client. Unhandled promise rejections are deprecated
error when doing the following.
exports.deleteBooking = (req, res, next) => {
req.body.courts.forEach(element => {
Booking.deleteOne({$and: [
{ cid: element.cid },
{ year: element.day.year }
]})
.then(result => {
res.status(201).json({
message: result
});
})
.catch(() => {
res.status(500).json({
error: 'error'
})
});
})
};
I am sending an array of objects to my server and want to perform one deletion per object.
Because of the forEach
it might run the .catch after the headers are sent to the client. What is the correct way of handling .then
and .catch
with a forEach loop?
Thank you!
EDIT: I forgot to add that if I would delete the .then
and .catch
the query would still run, and without errors. But I would like to keep the error handling in this case.
node.js mongodb mongodb-query
node.js mongodb mongodb-query
asked Nov 22 at 14:27
Devchris
102
102
Should the response, whether it is error or message be send after the entire forEach loop is done or for each item in the loop?
– Jeevan
Nov 22 at 14:57
So I tried this but then it gives the errorCannot read property 'then' of undefined
– Devchris
Nov 22 at 15:17
add a comment |
Should the response, whether it is error or message be send after the entire forEach loop is done or for each item in the loop?
– Jeevan
Nov 22 at 14:57
So I tried this but then it gives the errorCannot read property 'then' of undefined
– Devchris
Nov 22 at 15:17
Should the response, whether it is error or message be send after the entire forEach loop is done or for each item in the loop?
– Jeevan
Nov 22 at 14:57
Should the response, whether it is error or message be send after the entire forEach loop is done or for each item in the loop?
– Jeevan
Nov 22 at 14:57
So I tried this but then it gives the error
Cannot read property 'then' of undefined
– Devchris
Nov 22 at 15:17
So I tried this but then it gives the error
Cannot read property 'then' of undefined
– Devchris
Nov 22 at 15:17
add a comment |
2 Answers
2
active
oldest
votes
You can use the Promise.all instead of using forEach
exports.deleteBooking = (req, res, next) => {
const promises = req.body.courts.map(element =>
Booking.deleteOne({$and: [
{ cid: element.cid },
{ year: element.day.year }
]})
);
Promise.all(promises).then((results) => {
// Handle the result response
})
.catch((error) => {
// Handle the error response
})
};
Thanks a lot! This fixed the problem!
– Devchris
Nov 25 at 18:55
add a comment |
res.status(201).json
is within the forEach
loop hence why you are getting the above error: you can only send data once.
To fix this, you basically need to send the deleteOne
operations once and use bulkWrite()
as it allows you to send multiple deleteOne operations to the MongoDB server in one command. It takes in input in form of an array of objects like the following
Booking.bulkWrite([
{ deleteOne: { filter: { cid: 1, year: 2007 } } },
{ deleteOne: { filter: { cid: 2, year: 2007 } } },
{ deleteOne: { filter: { cid: 3, year: 2007 } } },
{ deleteOne: { filter: { cid: 4, year: 2007 } } },
])
So in your case you can map req.body.courts
array to the above deleteOne
operations as
exports.deleteBooking = (req, res, next) => {
Booking.bulkWrite(
req.body.courts.map(({ cid, day }) => ({
deleteOne: { filter: { cid, year: day.year } }
}))
).then(message => {
res.status(201).json({ message })
}).catch(error => {
res.status(500).json({ error })
})
}
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use the Promise.all instead of using forEach
exports.deleteBooking = (req, res, next) => {
const promises = req.body.courts.map(element =>
Booking.deleteOne({$and: [
{ cid: element.cid },
{ year: element.day.year }
]})
);
Promise.all(promises).then((results) => {
// Handle the result response
})
.catch((error) => {
// Handle the error response
})
};
Thanks a lot! This fixed the problem!
– Devchris
Nov 25 at 18:55
add a comment |
You can use the Promise.all instead of using forEach
exports.deleteBooking = (req, res, next) => {
const promises = req.body.courts.map(element =>
Booking.deleteOne({$and: [
{ cid: element.cid },
{ year: element.day.year }
]})
);
Promise.all(promises).then((results) => {
// Handle the result response
})
.catch((error) => {
// Handle the error response
})
};
Thanks a lot! This fixed the problem!
– Devchris
Nov 25 at 18:55
add a comment |
You can use the Promise.all instead of using forEach
exports.deleteBooking = (req, res, next) => {
const promises = req.body.courts.map(element =>
Booking.deleteOne({$and: [
{ cid: element.cid },
{ year: element.day.year }
]})
);
Promise.all(promises).then((results) => {
// Handle the result response
})
.catch((error) => {
// Handle the error response
})
};
You can use the Promise.all instead of using forEach
exports.deleteBooking = (req, res, next) => {
const promises = req.body.courts.map(element =>
Booking.deleteOne({$and: [
{ cid: element.cid },
{ year: element.day.year }
]})
);
Promise.all(promises).then((results) => {
// Handle the result response
})
.catch((error) => {
// Handle the error response
})
};
answered Nov 22 at 15:19
Med Lazhari
26215
26215
Thanks a lot! This fixed the problem!
– Devchris
Nov 25 at 18:55
add a comment |
Thanks a lot! This fixed the problem!
– Devchris
Nov 25 at 18:55
Thanks a lot! This fixed the problem!
– Devchris
Nov 25 at 18:55
Thanks a lot! This fixed the problem!
– Devchris
Nov 25 at 18:55
add a comment |
res.status(201).json
is within the forEach
loop hence why you are getting the above error: you can only send data once.
To fix this, you basically need to send the deleteOne
operations once and use bulkWrite()
as it allows you to send multiple deleteOne operations to the MongoDB server in one command. It takes in input in form of an array of objects like the following
Booking.bulkWrite([
{ deleteOne: { filter: { cid: 1, year: 2007 } } },
{ deleteOne: { filter: { cid: 2, year: 2007 } } },
{ deleteOne: { filter: { cid: 3, year: 2007 } } },
{ deleteOne: { filter: { cid: 4, year: 2007 } } },
])
So in your case you can map req.body.courts
array to the above deleteOne
operations as
exports.deleteBooking = (req, res, next) => {
Booking.bulkWrite(
req.body.courts.map(({ cid, day }) => ({
deleteOne: { filter: { cid, year: day.year } }
}))
).then(message => {
res.status(201).json({ message })
}).catch(error => {
res.status(500).json({ error })
})
}
add a comment |
res.status(201).json
is within the forEach
loop hence why you are getting the above error: you can only send data once.
To fix this, you basically need to send the deleteOne
operations once and use bulkWrite()
as it allows you to send multiple deleteOne operations to the MongoDB server in one command. It takes in input in form of an array of objects like the following
Booking.bulkWrite([
{ deleteOne: { filter: { cid: 1, year: 2007 } } },
{ deleteOne: { filter: { cid: 2, year: 2007 } } },
{ deleteOne: { filter: { cid: 3, year: 2007 } } },
{ deleteOne: { filter: { cid: 4, year: 2007 } } },
])
So in your case you can map req.body.courts
array to the above deleteOne
operations as
exports.deleteBooking = (req, res, next) => {
Booking.bulkWrite(
req.body.courts.map(({ cid, day }) => ({
deleteOne: { filter: { cid, year: day.year } }
}))
).then(message => {
res.status(201).json({ message })
}).catch(error => {
res.status(500).json({ error })
})
}
add a comment |
res.status(201).json
is within the forEach
loop hence why you are getting the above error: you can only send data once.
To fix this, you basically need to send the deleteOne
operations once and use bulkWrite()
as it allows you to send multiple deleteOne operations to the MongoDB server in one command. It takes in input in form of an array of objects like the following
Booking.bulkWrite([
{ deleteOne: { filter: { cid: 1, year: 2007 } } },
{ deleteOne: { filter: { cid: 2, year: 2007 } } },
{ deleteOne: { filter: { cid: 3, year: 2007 } } },
{ deleteOne: { filter: { cid: 4, year: 2007 } } },
])
So in your case you can map req.body.courts
array to the above deleteOne
operations as
exports.deleteBooking = (req, res, next) => {
Booking.bulkWrite(
req.body.courts.map(({ cid, day }) => ({
deleteOne: { filter: { cid, year: day.year } }
}))
).then(message => {
res.status(201).json({ message })
}).catch(error => {
res.status(500).json({ error })
})
}
res.status(201).json
is within the forEach
loop hence why you are getting the above error: you can only send data once.
To fix this, you basically need to send the deleteOne
operations once and use bulkWrite()
as it allows you to send multiple deleteOne operations to the MongoDB server in one command. It takes in input in form of an array of objects like the following
Booking.bulkWrite([
{ deleteOne: { filter: { cid: 1, year: 2007 } } },
{ deleteOne: { filter: { cid: 2, year: 2007 } } },
{ deleteOne: { filter: { cid: 3, year: 2007 } } },
{ deleteOne: { filter: { cid: 4, year: 2007 } } },
])
So in your case you can map req.body.courts
array to the above deleteOne
operations as
exports.deleteBooking = (req, res, next) => {
Booking.bulkWrite(
req.body.courts.map(({ cid, day }) => ({
deleteOne: { filter: { cid, year: day.year } }
}))
).then(message => {
res.status(201).json({ message })
}).catch(error => {
res.status(500).json({ error })
})
}
answered Nov 22 at 15:33
chridam
65.9k12104137
65.9k12104137
add a comment |
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Should the response, whether it is error or message be send after the entire forEach loop is done or for each item in the loop?
– Jeevan
Nov 22 at 14:57
So I tried this but then it gives the error
Cannot read property 'then' of undefined
– Devchris
Nov 22 at 15:17