Mongoose query always returns empty array

Question

Im trying to make a greater than query but it always returns an empty array.

    const productSchema = require("./productsSchema");
const getProductsGreaterThan = async (minimum_id) => {
try{
    console.log(minimum_id);
    const productById = await productSchema.find({id: {$gt:minimum_id}});
    return productById
}
catch(err){
    console.error(err);
}
}

This is my controller:

if (req.params.minimum_id) {
    const productsById = await productsModel.getProductsGreaterThan(req.params.minimum_id);
    res.status(200).json(productsById);
}

It should return the products with an ID greater than what i type in the req.params...

routes.get("/products/:minimum_id?",productRoutes.getProductsGreaterThan);

But when i write the route like this in the url it gives me an empty array => http://localhost:3000/products/10 What is wrong with this code? Im very confused, because other queries like find({}) work. My mongoose version is 6.2.10.

Have you tried const productById = await productSchema.find({id: {$gt:parseInt(minimum_id, 10)}});? — chridam
– chridam, Commented Apr 12, 2022 at 14:09
I just tried, but its not working :( It gives me an empty string aswell — Alberto Enríquez
– Alberto Enríquez, Commented Apr 12, 2022 at 14:50
Would be helpful if you can provide your sample dataset. A common error is filtering on incorrect field, such as filtering on id instead of _id — ray
– ray, Commented Apr 12, 2022 at 16:48

Alberto Enríquez · Accepted Answer · 2022-04-24 15:51:23Z

4

Solved. Somehow the problem was in the name of the collection of mongoDB. It seems it should be always in lower-case and plural.

answered Apr 24, 2022 at 15:51

Alberto Enríquez

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1 Comment

Adri w Ukraine May 26 at 19:50

Crazy. 's' is required in collection names. c.f. stackoverflow.com/questions/10547118

Quzu · Accepted Answer · 2022-11-21 21:00:44Z

2

I solved my issue by changing MongoDB table name. The problem was in the name of the collection of mongoDB. Your table names should be always in lower-case and plural (this was most critical thing in my case). Maybe you can try this.

answered Nov 21, 2022 at 21:00

Quzu

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Comments

Dylan L. · Accepted Answer · 2022-04-12 19:23:31Z

1

If you are using mongoose and MongoDB the correct id format is _id. So you would do the following:

productSchema.find({_id: {$gt:minimum_id}})

answered Apr 12, 2022 at 19:23

Dylan L.

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1 Comment

Alberto Enríquez Over a year ago

Yeah, but that id is one I put in the Schema. Not the authomatic one.

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