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.findOne not passing results to callback


.findOne not passing results to callback

By : Jaclyn Karnowski
Date : November 22 2020, 09:00 AM
I hope this helps you . .findOne for the node MongoDB driver takes three arguments, and none of them seem to be optional. Try:
code :
this.db.collection('weather').findOne(
    weatherCacheQuery, {}, 
    function(err, doc) {
        console.log(JSON.stringify(err));
        console.log(JSON.stringify(doc));
    }
});
find().limit(1).next


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JQuery:Passing callback method with or without braces giving different results

JQuery:Passing callback method with or without braces giving different results


By : Sumeet Kumar Sinha
Date : March 29 2020, 07:55 AM
I wish this helpful for you In the second case, you're passing the result of evaluating sayHello(), whereas in the first case, you're passing the actual function sayHello.
So because sayHello shows an alert, it will show the alert as soon as it's executed. In the first case, it's executed when hide is complete (as a callback), whereas in the second case it's executed when you set up the call to hide() (probably before the hide actually occurs).
Mongoose findOne callback gives me null

Mongoose findOne callback gives me null


By : Owen Roman
Date : March 29 2020, 07:55 AM
hope this fix your issue Yet another victim of mongoose auto-pluralization of collection names. Mongoose is querying the collection 'Restaurants' instead of 'Restaurant'.
code :
var eventSchema = new mongoose.Schema({
  name: String,
  visit: Date
}, {collection: 'Restaurant'}); //override default collection name

var Restaurant = mongoose.model('Restaurant', eventSchema);
How to send final response from findOne() callback?

How to send final response from findOne() callback?


By : user2509334
Date : March 29 2020, 07:55 AM
hope this fix your issue First of all, your findOne is here a find. That's not related to your problem, but it is slightly confusing, and you should ensure you are getting data in the format you expect.
As for finishing the request after marking it bad, I have not used sails, but I was able to end execution in the past by using res.send(). EDIT: after looking at the docs, it seems this is done for you by .badRequest(), so ignore that part.
code :
var userQuery = User.findOne({ email: req.body.email }).exec();
userQuery.addBack(function(err, user) {
    if(!!user) res.badRequest('...');
    else create_user();
});
User.findOne({ email: req.body.email }, function(err, user) {
    if (user) { // or perhaps you want if (!err)
        User.create(...);
    } else {
        // handle error
    }
});
reactjs passing a callback results in undefined

reactjs passing a callback results in undefined


By : Avorthoren
Date : March 29 2020, 07:55 AM
This might help you It is because in your Exam component's map function inside render method this keyword is not refering to the Exam component object. you can either fix issue with Es6 arrow function or create local variable called _this and assign this to _this before map function
with arrow function
code :
    var questions = this.state.questions.map((question, index) =>{
        return (
            React.createElement(Question, {
                key: index, 
                index: index, 
                src: question, 
                handleAddChoice: this.onAddChoice})
        );
    });
Mongoose findOne() callback returning null

Mongoose findOne() callback returning null


By : Thanawat Phothisat
Date : March 29 2020, 07:55 AM
Does that help I'm trying to find a user in my node app with mongoose by using , In your userSchema the publicAddress is part of local object.
code :
var userSchema = mongoose.Schema({
    local: {
        username: String,
        password: String,
        pictureCaption: String,
        publicAddress: String,
        contractAddress: String
    }
});
User.findOne({"local.publicAddress": publicAddress}, (err, user) => {
        if (err) {
            res.status(500).send(err)
        } else {
            console.log(user);
        }
    });
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