Mongoose programatically update single array property item

Question

I'm trying to update a single array property item using mongoose:

const updatePurchaseItem = async (purchaseOrder, itemIndex, product) => {

    let position = "items." + itemIndex + ".product_id";
    let query = {
            _id: purchaseOrder._id,
            deletedAt: null
    };

    await PurchaseOrderModel.update(query, position: product._id);
}

I'm getting the following error:

Cast to ObjectId failed for value "items.1.product_id" at path "_id" for model "PurchaseOrder"

What is the code proper syntax to make this work?

What does path "_id" means ?

Both purchaseOrder and product are read from the database using mongoose.findOne() .

Answer 1

Have you tried parsing the parameter as an object? As in {position: product._id}