I'm trying to create a patch API for a database of products in a MERN application that keeps track of expiry dates.

The idea is when a product's UPC is given, as well as the date in which it expires, the specific product is updated with the date given added to expiry dates, provided the date isn't in there already.

Sample data:

[
{
     "_id":{"$oid":"6795e982c4e5586be7dc5bfc"},
     "section":"Dairy",
     "products":
     [
          {
               "productUPC":"068700115004",
               "name":"Dairyland 2% Milk Carton 2L",
               "expiryDates":
               [
                    {
                         "dateGiven":"2025-01-30T00:00:00.000-06:00",
                         "discounted":true
                    }
               ]
          },
          {
               "productUPC":"068700011825",
               "name":"Dairyland 1% Milk Carton 2L",
               "expiryDates":[
               ]
          }
     ]
}
]

The following is the node for the patch API:

router.patch("/products/:productUPC&:expiryDate", async (req, res) => {
    try {
        let collection = await db.collection("storeSections");
        let result = await collection.updateOne({
          "products.expiryDates.dateGiven": {
            $ne: new Date(moment(req.params.expiryDate)).toISOString(true)
          }
          },
          {
            $push: {
              "products.$[x].expiryDates": {
                "dateGiven": new Date(moment(req.params.expiryDate)).toISOString(true),
                "discounted": false
              }
            }
          },
          {
            arrayFilters: [
              {
                "x.productUPC": req.params.productUPC
              }
            ]
          })
          
        res.send(result).status(200);
    } catch(err) {
        console.error(err);
        res.status(500).send("Error updating record.");
    }
});

And here is a sample patch that I sent with Postman:

localhost:5050/record/products/productUPC=068700115004&expiryDate=2025-02-21

The update worked just fine in a mongoDB playground... why isn't it working now?