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MongoDB and URL routing


MongoDB and URL routing

By : nayhem
Date : November 20 2020, 03:01 PM
like below fixes the issue While creating a document if we provide _id as part of our insert statement then the value provided by the user will be taken by mongodb, for this approach all we need to ensure is the _id should be unique value. No worries even if you give a repeated value for _id then we will be getting an error message.
I have a sample collection named stackoverflow and its document having two attributes
code :
db.stackoverflow.insert({ _id:1, movie:"Mission Impossible 1"})
WriteResult({ "nInserted" : 1 })
WriteResult({
        "nInserted" : 0,
        "writeError" : {
                "code" : 11000,
                "errmsg" : "E11000 duplicate key error collection: test.stackove
rflow index: _id_ dup key: { : 1.0 }"
        }
})
// Find the document and store it in a variable
doc = db.movies.findOne({_id: ObjectId("5dd45467d55f4d2d2a115502")})

// Give a convenient new _id
doc._id = 1

// Insert the document using the new _id
db.movies.insert(doc)

// Now we will be having two documents for the same movie, so remove the old one
db.movies.remove({_id: ObjectId("5dd45467d55f4d2d2a115502")})


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Node.js Express routing with MongoDB

Node.js Express routing with MongoDB


By : deadlockuk
Date : March 29 2020, 07:55 AM
it helps some times to Wes Johnson, I found my way out. I was blindly following a dated tutorial, which used deprecated methods from MongoDb. Below is the code snippet I finally used to implement the 'list documents' feature:
code :
exports.list = function(req, res){
    Document.find({},function(err, documents) {
        switch (req.params.format) {
            case 'json':
                res.send(documents.map(function(d) {
                    return d.toObject();
                }));
            break;
            default:
                res.render('index', { title: 'Indx' });
        }
    });
};
MongoDB Shard Cluster routing

MongoDB Shard Cluster routing


By : Dima L
Date : March 29 2020, 07:55 AM
around this issue The query is sent from your application to a local or remote mongos instance which, contrary to its name (Mongo Shard), is in fact a router.
If your query contains the shard key then the mongos router will use cached data from the config servers to determine what shards to query.
Nodejs still routing to a deleted entry in mongodb

Nodejs still routing to a deleted entry in mongodb


By : Emmanuel
Date : March 29 2020, 07:55 AM
With these it helps send to show only if student is found. according to your logic if there is no error it will got to 'show' as not found is not error so it will goto show.
code :
router.get('/:id', function(req, res) {
    Student.findById(req.params.id, function(err, foundStudent) {
        if(err) {
            console.log(err);
            return res.redirect('/students');
        }

        if(foundStudent){
        res.render('pages/students/show', { student : foundStudent });
        }

           return res.redirect('/students');
    });
});
Is there any option similar to ElasticSearch's routing in MongoDB?

Is there any option similar to ElasticSearch's routing in MongoDB?


By : Casmar
Date : March 29 2020, 07:55 AM
Hope that helps The equivalent concept in MongoDB is the shard key. If mongos can determine from the shard key that only some (or one) of the shards holds data relevant to the query, only those shards will be accessed.
MongoDB, Nodejs routing order

MongoDB, Nodejs routing order


By : rar lumii
Date : March 29 2020, 07:55 AM
This might help you You have written the same API path twice. :param_name can't be used to differentiate between two different paths. Try
code :
//Get a ticket by ID

app.get('/tickets/byid/:_id', function(req, res) {
    Ticket.getTicketById(req.params._id, function(err, ticket) {
        if (err) {
            throw err;
        }
        res.json(ticket);
    });
});

//Get a ticket by registration number

app.get('/tickets/byreg/:vehRegistration', function(req, res) {
    Ticket.getTicketByReg(req.params.vehRegistration, function(err, ticket) {
        if (err) {
            throw err;
        }
        res.json(ticket);
    });
});
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