Error in graphql playground with `type: :append` about ash_graphql

[zachdaniel]

I see the issue. The options controlling if primary key/what identities should be used for looking up aren't set:

    lookup_with_primary_key?: [
      type: :boolean,
      doc: """
      If the managed_relationship has `on_lookup` behavior, this option determines whether or not the primary key is provided in the input object for looking up.

      This option is ignored if there is no `on_lookup`.
      """
    ],
    lookup_identities: [
      type: {:list, :atom},
      doc: """
      If the managed_relationship has `on_lookup` behavior, this option determines which identities are provided in the input object for looking up.

      This option is ignored if there is no `on_lookup`. By default *all* identities are provided.
      """
    ],

And whats happening is that the resulting input object has no fields. I'll make it raise a much more intelligible error in this case.