How to call custom server side function with mongodb nodejs driver

Question

I add a function to system.js that returns if number is odd or not and could not call it with aggregate function of nodejs driver. How can I call it?

Community · Accepted Answer · 2017-05-23 12:09:48Z

1

To call a custom function:

You can use db.eval(). For example:

db.eval("echo(5)", function(err, result) {
    assert.equal(null, err);
    assert.equal(5, result);
});

But note that, as the documentation suggests, defining and calling a system level javascript function NOT recommended.

To use a function in an aggregation:

Basically, external/custom functions don't work with the aggregation framework. Everything is parsed to BSON on input, so no JavaScript or anything else is allowed.

Have a look at Call function inside mongodb's aggregate? to find a workaround.

edited May 23, 2017 at 12:09

CommunityBot

11 silver badge

answered Apr 17, 2017 at 8:15

Derlin

9,9112 gold badges34 silver badges57 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Cengiz Poyraz Over a year ago

I think that function should be able to be used with queries. Could you give an example with aggregate function?

Collectives™ on Stack Overflow

How to call custom server side function with mongodb nodejs driver

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related