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How to fetch certain quantity of objects from mongoDB with mongoose? (Node.js)


How to fetch certain quantity of objects from mongoDB with mongoose? (Node.js)

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How to fetch certain quantity of objects from mongoDB with mongoose? (Node.js)
Tag : javascript , By : Lex Viatkine
Date : November 28 2020, 12:01 PM

I hope this helps . I have a MongoDB database and a React web page that shows the content using http requests to my Node.js server. This Node.js uses mongoose to communicate with the DB. The react web page shows up to 10 entries per page and it is slow when the database gets big: , You can use skip() and limit() to do this.
Example:
const movies = await Movie.find()
    .select("-__v")
    .skip(perPage * currentPage)
    .limit(perPage)
    .sort("name");

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Mongoose, MongoDb, Node. Mongoose object not registering find()


Tag : node.js , By : Vijayant Singh
Date : March 29 2020, 07:55 AM
may help you . When i'm getting to my routes and requesting to getUSers from my mongoDB it says the User.find() is not defined. Sorry in advance if i use incorrect terminology i'm jumping in face first. , Change the line where you require User to
var User = require('./node_modules/user-app/user').User;
module.exports = {User:User};

Fetch entries from mongodb using mongoose


Tag : node.js , By : ffmmjj
Date : March 29 2020, 07:55 AM
it helps some times According to Mongo docs, you should pass either a string or javascript function to $where, and you pass javascript expression, which gets evaluated in place.
Also, your query can be simplified to
PostModel.Post.find({
    activeFlag: true,
    tags: {
      $exists: true,
      $not: /^(inc:|ecx:)/
    }
}, function(err, stack) {
    if (!err) {
        logger.debug('Posts found successfully.');
    } else {
        logger.error('Problem in finding posts, error :' + err);
    }
});

How to effectively fetch comments for posts with MongoDB/mongoose?


Tag : node.js , By : Hadley
Date : March 29 2020, 07:55 AM
I wish this helpful for you Try to do it through mongoose populate and aggregate. Sample codes as below.
var Post = mongoose.model('Post', PostSchema);
var Comment = mongoose.model('Comment', CommentSchema);

Comment.aggregate([
    {$group: {_id: '$_post', comments: {$push: '$body'}}}
    // ...
    ], function(err, result) {
        if (err)
           // error handling
        Post.populate(result, {path: "_id"}, function(err, ret) {
            if(err)
                console.log(err);
            else
                console.log(ret);
        });
});

Cannot fetch from or insert data to mongodb using mongoose


Tag : node.js , By : Adam Hill
Date : March 29 2020, 07:55 AM
it fixes the issue I figured out the issue, it wasn't an issue with the credentials. It was an issue with the mongoose version. The mongoose version I used didn't support the authentication. I had to remove the package and reinstall the latest version. with
node install mongoose@latest

Duplicate Objects after creating object within object in Mongoose (MongoDB, Node.JS, express)


Tag : node.js , By : mhedberg
Date : March 29 2020, 07:55 AM
wish helps you Because Array.forEach is blocking for asynchronous methods, you are getting duplicates. For an asynchronous-friendly version of Array.forEach, you can the async module or Promises.
The latter can be followed with this example (untested):
let regionsPromise = Region.insertMany(dummyregions);
let productsPromise = Product.insertMany(dummyproducts);

Promise.all([regionsPromise, productsPromise])
    .then(([regions, products]) => {

        console.log(regions); // check regions array
        console.log(products); // check products array

        let ids = regions.map(r => r._id);
        console.log(ids); // check ids

        Region.update(
            { '_id': {  '$in': ids } },
            { '$push': { 'products': { '$each': products } } },
            { 'multi': true }
        );
    })
    .catch((err) => {
        /* Error handling */
        console.error(`Error ${err.message}`);
    });
(async () => {

    try {

        const regions = await Promise.all(dummyregions.map(async (reg) => {
            await Region.create(reg);
        }));

        const products = await Promise.all(dummyproducts.map(async (prod) => {
            await Product.create(prod);
        }));

        for (let region of regions) {
            await region.findByIdAndUpdate(region._id, { 
                '$push': { 
                    'products': { '$each': products } 
                } 
            });
        }

        /*

        if (regions && regions.length) {
            await Promise.all(
                regions.map(async (r) => {
                    await r.findByIdAndUpdate(r._id, { 
                        '$push': { 
                            'products': { '$each': products } 
                        } 
                    });
                })
            );
        }

        */

    } catch (err) {
        console.error(`Error ${err.message}`);
    }
})();
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