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ViewsWhy am I getting an "undefined" result from my MongoDBQuery in Node?
I've already stablished a DB with it's schema like this:
When I use my search function in Nodejs it works perfectly and returns my info like this:\
So, why is is than when I try to fectch my user from mongodb and get the parameter "examenes":
I get this undefined return?:
3 answers
Answer question0
I think you should use the await keyword
try{
var user = await model.findOne({ _id: req.params.id});
} catch (e) {
// Handle Errors
};
Or
model.findOne({ _id: req.params.id}).then(result => {
var user = result;
}).catch(e=> {
// Handle Errors
});
0
Have you added mergeParams in your router?
This options adds params object to the request
const router = express.Router({ mergeParams: true });
then
/predict/:id results in req.params.id
By default this option is disabled in express
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The problem is you are not using await so in the line console.log(user.examenes) the variable user is not the data returned by mongo; is another object without attribute examenes. And trying to access the value is undefined.
So you can use:
let user = await (usuario.findOne({_id: req.params.id}))