Many-to-Many relations and subscriptions in Amplify

Hello,

How can I have a subscription notification message (upon an update) include the full relation data in a many-to-many relation?

I have a many-to-many relations using the Amplify @model and @connection directives, as it is documented in the Amplify docs. In this case, I have a Person and City entities, where one person can belong to many cities, and one city can belong to many persons. To model this, I have a PersonCity connecting entity.

For queries, I am able to fetch all the cities for a person with a custom GraphQL query, which I pass to the graphqlOperation() function.

My problem is that I also want the cities returned via subscription messages when the Person is updated (for instance, a new city is added). Currently, I only receive City ID in the cities array inside Person. However, I want the subscription message to return all the City fields as well, e.g. name.

Any help would be greatly appreciated.

This is the general schema I'm working with:

type Person @model
{
  id: ID!,
  cities: [PersonCity] @connection(name: "PersonCities")
}

type City @model 
  {
  id: ID!
  name: String!
  persons: [PersonCity] @connection(name: "CityPersons")
}

type PersonCity @model(queries: null) 
 {
  id: ID!
  person: Person! @connection(name: "PersonCities")
  city: City! @connection(name: "CityPersons")  
}