I'm working on a project in which, at a moment, have to redirect the user if the id of a course does not exist.
This is the code:
router.get('/taller/:id', (req, res) => {
let tallerId = req.params.id;
Taller.findOne({_id: tallerId}).then(taller => {
if(taller) {
res.render('taller');
} else {
res.redirect('/dashboard');
}
});
});
The idea is that if the id passed in the params actually exists in the Talleres collection, the taller view is rendered. But, if it isn't, then the user should be redirected to the dashboard.
When the code with an invalid id runs I get:
UnhandledPromiseRejectionWarning: CastError: Cast to ObjectId failed for value "5c7d9da0567a653a40295bc}" at path "_id" for model "Taller"
Thanks in advance for any help.
Tom.
You did not define the catch block so the rejections i.e errors are not handled try below code
router.get('/taller/:id', (req, res) => {
let tallerId = req.params.id;
Taller.findOne({_id: tallerId}).then(taller => {
if(taller) {
res.render('taller');
} else {
res.redirect('/dashboard')
}
});
}).catch(err=>{console.log(err)});
Related
I've been working on one of my first API projects with NodeJS, Express and MongoDB. I can save new documents into the database with collection.insertOne(newDocument) method but I can not take existing documents and output them using collection.find({}).
Can you please help me:')
export const visualizeUser = (req, res) => {
console.log("you are searching the user with username " + req.body.username);
users.find({username: 'yavuz'}, (err, data) => {
if(err)
console.log(err);
else
console.log(data);
});
}
thats the code I have written.
MongoInvalidArgumentError: Argument "options" must not be function
and that is the error I am getting.
Your help is really appreciated.
Like error message is saying, you cannot pass function as options argument.
Look here: docs
Your code should look like this:
const visualizeUser = async (req, res) => {
try{
console.log("you are searching the user with username " +
req.body.username);
let data = await users.find({username: 'yavuz'});
console.log(data)
} catch(e) {
console.log(e)
}
}
I have been playing around with ExpressJS I normally use FastAPI. I can't seem to generate an error using Supabase.
I have this endpoint
app.delete('/api/delete-book/:id', cors(corsOptions), async (req, res) => {
const {data, error} = await supabase
.from('books-express')
.delete()
.match({id: req.params.id})
if (error) {
res.status(400).send({message: `ERROR! ${error.message}`})
}
if (data)
res.send({
message: `Book ID ${req.params.id} has been deleted from the database`,
})
})
This works when it comes to deleting a book via an ID. However if I enter an invalid ID I get the data if block firing.
There is no book with an ID of 222 in the database, I would expect the error to fire but its just null
Any ideas here?
This is expected behaviour; not matching any rows is not considered an error condition in postgres.
If you'd like to check if any rows were deleted, you can use something akin to (on supabase-js 2.x):
const { data, error } = await supabase.from('books-express')
.delete()
.match({id: req.params.id})
.select() // not needed on 1.x libs
if (error || data.length === 0) {
res.status(400).send({...})
}
I am write API in expressjs with Sequence. But I got problem with return value when update!
I follow a tutorial on internet but it got error when num=[1] not num=1 although updating success!
exports.update = (req, res) => {
const { id } = req.params;
Post.update(req.body, {
where: { id }
})
.then((num) => {
if (num === 1) {
res.send({
message: 'Post was updated successfully.'
});
}
else {
res.send({
message: `Cannot update Post with id=${id}. Maybe Post was not found or req.body is empty!`
});
}
})
.catch((err) => {
res.status(500).send({
message: `Error updating Post with id=${id}`
});
});
};
So, what return value after call update method? and how do I solve it? Thanks.
The sequelize document of update is
public static async update(values: object, options: object): Promise<Array<number, number>>
Promise<Array<number, number>>
The promise returns an array with one or two elements. The first element is always the number of affected rows, while the second element is the actual affected rows (only supported in postgres with options.returning true).
So, it will not return only the number. you need to follow the document.
To resolve
.then((nums) => {
const num = nums[0]
.....
I want to bind params in node js and this is my code but shows some erros,
app.get("/single/:id", async (req, res) => {
let id = req.params.id;
console.log(id);
try{
const singleMovie = await Movies.findById(id)
res.render("single", {
singleMovie: singleMovie
});
}catch(err){
console.error(err.message);
}
});
shows me this warning,
Cast to ObjectId failed for value "undefined" at path "_id" for model
"Movies" and id is undifined
any way to fix this?
In your code res.render("single", { should be res.json("single", {
Try the code below... sending the response in json just to test it....
if you get the same error you are getting, then there is a problem somewhere in your code. Because The block of code you posted looks fine!
app.get("/single/:id", async (req, res) => {
let id = req.params.id;
console.log(id);
try{
const singleMovie = await Movies.findById(id)
res.json({
singleMovie: singleMovie
});
}catch(err){
console.error(err.message);
}
});
Also make sure you are using nodejs -v 8+ and mongoose -v 5+
what's the proper way to check for undefined values? What I want to do is to have a PUT method that will update those fields that are not empty. For example, if I send req.body.name = 'John' and no req.body.job I want my request to only change the name.
Some code:
router.put('/:id', (req, res) => {
const query = {_id: req.params.id};
const update = {
$set: {
name: req.body.name,
job: req.body.job
}
};
User.findOneAndUpdate(query, update,
(err, userUpdated) => {
if (err) {
console.log('Error while updating');
console.log(err);
} else {
res.send(userUpdated);
}
});
});
This will of course throw an error:
CastError: Cast to number failed for value "undefined" at path "job"
Now I can manually check if req.body.job is empty and if it is set it's value to the value the user had previously, but that seems like a hack, not elegant and a lot of writing for each route.
I have checked the docs but none of the options provided there seem to do the job. I also came across something like express validator but this will probably just do a return if the value is empty. Another options would be to simply send the value from the front-end part.
I'm new to backend development and I'm not sure if I'm doing stuff the "right way". So please, any comment on how it should be done would be nice (also if my code looks odd, feel free to guide me :)), thanks!
You can write your own method to do this.
For example this example
var req = {body: {name: undefined, job: 'yes'}};
const _ = require('lodash');
const out = {};
_(req.body).forEach((value,key) => {
if (!_.isEmpty(value)){
out[key] = value;
}
});
console.log(out);
Is having this output
{ job: 'yes' }
You can also write it as middleware, if you want, if you write it as this
function onlyNotEmpty(req, res, next) => {
const out = {};
_(req.body).forEach((value, key) => {
if (!_.isEmpty(value)) {
out[key] = value;
}
});
req.bodyNotEmpty = out;
next();
}
Then you can write your method with middleware
router.put('/:id', onlyNotEmpty, (req, res) => {
const query = {_id: req.params.id};
const update = {
$set: req.bodyNotEmpty
};
// This will be the same
});