Using a nested primary id for update and deletes

[trevordammon]

I am trying to make a graphql update to a data object on my mock server. The data object's primary key is nested in another object. The structure looks like this:
type PersonId {

  id_: String!
}

type Person {
  person_id: PersonId
  name: Name!
}

In my Apollo Client I declare that keyField as primary:

const options = {
  typePolicies: {
    Person: {
      keyFields: ['person_id', ['id_']],
    },
  },
};

export const client = new ApolloClient({
  uri: '/graphql',
  cache: new InMemoryCache(options),
});

However I am not able perform updates using that nested id.

I expect to be able to make updates to the People object with:

const people = server.schema.db._collections.filter(
                (record) => record.name === 'people',
              );

const updatedPerson = people[0].update({primary_id:{id_:args.id_}} {
                name: {
                  first_name: args.first_name,
                  last_name: args.last_name,
                  middle_name: args.middle_name,
                },
                person_id: { id_: args.id_ },
              });

I have been working on this for quite a while and I can make the update when the id is on the People object but I can't seem to get things functioning with the nested structure.