[adamkl]

Well, Postgraphile is offering you a shortcut that comes with limitations.

A more complete approach would be to structure your application in a more typical fashion, and put a GraphQL layer on top. Have a data access layer that maps from our back end sources (databases/REST/RPC services) to GraphQL types. Then have a logic/authorization layer, with GraphQL on top. Using Postgrapile seems to take those application layers away for the sake of convenience.