Writing object ends up with function definitions

[ajfisher]

I'm trying to use the writer to output a CSV file. I have a list of objects that I'm processing with another part of my application and periodically I want to write the data out from those objects as they complete.

At the moment i'm simply doing a csvwriter.write(object) having already wired up the stream. When I do this, I get all the fields on the object correctly, however I then get all the methods that have been attached to the object prototype as well. A simplistic example of this is below:

const fastcsv = require('fast-csv');
const fs = require("fs");

function Place() {
    this.name = Math.random().toString(36).substring(10);
    this.id = Math.round(Math.random() * 100000);
    this.calculated_value = 0;
}

Place.prototype.calculate_something = function () {
    this.calculated_value = this.id * 2;
}

var csvwriter = fastcsv.createWriteStream({ headers: true });
csvwriter.pipe(process.stdout);

for (let i=0; i< 10; i++) {
    let temp_place = new Place();
    console.log(temp_place);
    csvwriter.write(temp_place);
}

If you run this you'll get something approximating the following output:

Place { name: 'c3byb30vrk162yb9', id: 5775, calculated_value: 0 }
name,id,calculated_value,calculate_something
c3byb30vrk162yb9,5775,0,"function () {

    this.calculated_value = this.id * 2;
}"Place { name: '6ie10d92e8p9fi529', id: 68461, calculated_value: 0 }

6ie10d92e8p9fi529,68461,0,"function () {

    this.calculated_value = this.id * 2;
}"Place { name: '6kfbqxd850l3yuv7vi', id: 34590, calculated_value: 0 }

6kfbqxd850l3yuv7vi,34590,0,"function () {

    this.calculated_value = this.id * 2;
}"
-- SNIP --

Which isn't expected. I've tried tracking this through to the write function but must confess I'm not really clear on what that's actually doing in this case...

Searching the docs, it doesn't appear I can limit the fields that are being passed which would get me sorted - however, it feels very brittle to me to taking the object, dumping just the keys I want and then passing that to the writer as that is a point of maintenance that will need to be kept in sync with original object.

[doug-martin]

Fixed in pr #159 will merge and publish in the morning.

[ajfisher]

Excellent - thanks for sorting that out!

On Tue, Sep 27, 2016 at 3:33 PM Doug Martin [email protected]
wrote:

Fixed in pr #159 #159 will merge
and publish in the morning.

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[doug-martin]

No Problem! Thanks for submitting the issue.