record.attach

Hi,

I have a customer with almost 800 projects.

We have a need to set up primary contact via script.
I imagine to do this with mass update script.

Adding the contact is working fine, but i can't set role as primary contact.
Has anyone done this ?

var id = record.attach({
                    record: {
                        type: 'contact',
                        id: obj[params.id]
                    },
                    to: {
                        type: params.type,
                        id: params.id,
                        attributes: {
                            role: -10,
                        }
                    }
                });

Vesku