GraphQL Subscriptions

toGraphQL is not enough to generate a subscription query. ngrx-entity-relationship provides a helper function called toSubscription to solve the issue.

For example

const query = toSubscription(
  toGraphQL('users', action.selector),
);

will generate

subscription {
  users {
    id
    # ...
  }
}

With Apollo service, it can be used like that

apollo.subscribe({
  query: gql(
    toSubscription(
      toGraphQL('users', action.selector),
    ),
  ),
}).subscribe(update => {
  // magic is here.
});