Joining Types

Adding edges between GraphQL types

In this example we are adding a reference to the User type on the Todo type.

final class TodoToUserSchemaModule extends SchemaModule {
  @SchemaModification(addField = "creator", onType = Todo.class)
  ListenableFuture<User> todoCreatorToUser(UserService userService, Todo todo) {
    return userService.getUserByEmail(todo.getCreatorEmail());
  }
}

In this case the Todo parameter is the parent object which can be referenced to get the creator's email.

This is how types are joined within and across APIs.