[federation] _resolve_reference field not removed from schema

[tristantreb]

Hi,

I have implemented a reference resolver using absinthe federation and noticed that the _resolve_reference field is not removed from the schema.

It looks like the behaviour is present in the library code (in the module Absinthe.Federation.Schema.Phase.RemoveResolveReferenceFields) but is not working.

Btw, I also implemented a reference resolver in node.js, and in this case the __resolve_reference field is indeed removed from the schema, which suggest that it's the right behaviour.

How can I remove the _reference_resolver field from my schema ?

[kzlsakal]

I believe the RemoveResolveReferenceFields only runs for SDL generation which is used by the federated router/gateway and also the Mix task to print the subgraph's SDL.

This means that the _resolveReference fields don't make it to the supergraph schema, but it's in the subgraph's schema with the current implementation. @kdawgwilk may correct me if I'm wrong but we may need to change approach if we are to remove the _resolveReference field from the schema itself.

[kdawgwilk]

If we remove it from the schema absinthe might remove the field from the blueprint altogether so maybe a good medium would be to just hide it from introspection.