How to access linked object attributes to define a constraint in EdgeDB SDL?

[aarandamendoza]

0

Hi there,
I'd like to create a constraint in an object's link that can check one or more attributes of the linked object to validate the relationship.

i.e. assign the ownership of a credit card to a person, but only if the person is 18 or older:

type CreditCard{
    required property card_number -> int64;
    required link owner -> Person {
        constraint expression on ( HoweverYouReferToTheLinkedObject.age >= 18 )
    };
    ...
}

Adding a multi link credit_cards attribute to the Person object won't be a valid workaround for me in this case.