How do I handle a mongodb id between angular and mongoose?

Because of Typescript's strong typing, I am passing Mongodb's _id as a string in angular. Example:

public setSelectedProduct = async (productId: string) => {...}


When I pass productId to the backend and try to access Mongodb using Mongoose in Node.js, it tells me productId is not a valid Mongodb id.

exports.getProduct = async (req, res) => {
console.log('req.params.productId', req.params.productId)
const productId = req.params.productId;

// const productId = new mongoose.Types.ObjectId(Number(req.params.productId));


try {
const product = await Product.findOne({_id: productId})
console.log('product', product);
// res.status(200).json(product);
} catch(error) {
console.error(error);
res.status(500).send("Problem getting selected product.");
}
}

CastError: Cast to ObjectId failed for value " 67420003204128e379f42946" (type string) at path "_id" for model "Product"
​

I try to convert from string to ObjectId using the following:

const productId = new mongoose.Types.ObjectId(Number(req.params.productId));


But the existing associated product is not returned.

How do I handle this?

Continue reading...