Question 115658 in Mongodb Question posted in
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How to solve TypeError: result.select is not a function in a Node.JS, Express JS and MongoDB App

I am creating a store API.

I am trying to filter out the result using the field from req.query and select. Everything else works fine except the select.

Error: TypeError: result.select is not a function

if (field) {
        const sortField = field.split(",").join(" ");
        result = result.select(sortField);
    }

enter image description here

Not sure why is the select not a function.

Tags:

2

Answers


  1. 0

    From the image, looks like result is a unresolved promise when you call the select.
    Also, there’s no select method for an array (witch I believe, is what you’re trying to filter out); instead you can use filter

    Try this:

    let newResult;
if (field && result) {
        const sortField = field.split(",").join(" ");
        newResult = result.filter(x=> x === sortField);
}
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  2. 0

    Try with:

    let products;
if (field) {
    products = await product.find(queryObject).select(field.split(',').join(' '));
} else {
    products = await product.find(queryObject);
}
res.status(200).json({ products, number: products.length });
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