findOne function queries for id and not the param

[JulSeb42]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

8.12.1

Node.js version

20.18.0

MongoDB server version

7.0.14

Typescript version (if applicable)

5.8.2

Description

I'm having an issue with the findOne function. I'm trying to get some data with the slug, and I'm getting this error:

CastError: Cast to ObjectId failed for value "<slug>" (type string) at path "_id" for model "<model>"

Steps to Reproduce

This is the function I'm using:

router.get("/product-slug/:slug", (req, res, next) => {
    return ProductModel.findOne({ slug: req.params.slug })
        .then(foundProduct => res.status(200).json(foundProduct))
        .catch(err => next(err))
})

Expected Behavior

No response