Grabbing data from a related entity to override current info with formula script

[nramsay]

I've an entity called 'Web Deliveries' here that has shipping address fields so we know where to send things. If the delivery is going to a contact we current have in the system (repeat customer), I can attach that contact to the Web Deliveries entity. What I'd like is to be able to overwrite the shipping address information from the attached contact if I attach one.

I assume I want to grab fields from record. But how do I code it to only grab the fields if I've attached the contact entity?

[yuri]

Assuming the link name is 'contact', the address field name is 'shippingAddress'.

if (contact && contact.shippingAddressStreet) {
    shippingAddressStreet = contact.addressStreet;
    shippingAddressCity = contact.addressCity;
    shippingAddressPostalCode = contact.addressPostalCode;
    shippingAddressState = contact.addressState;
    shippingAddressCountry = contact.addressCountry;
}