Add failing test for ParseIDs middleware inside mutation

[howleysv]

I'm not sure exactly how this can be fixed, but figured submitting a failing test could be useful to illustrate the issue.

Basically, the ParseIDs middleware fails when resolving objects below the root payload object in relay mutations.

[howleysv]

Test error is

  1) test parsing nested ids works with nested id args (Absinthe.Relay.Node.ParseIDsTest)
     test/lib/absinthe/relay/node/parse_ids_test.exs:501
     ** (RuntimeError) Can't find ParseIDs schema root argument :input
     code: |> Absinthe.run(SchemaClassic)
     stacktrace:
       (absinthe_relay) lib/absinthe/relay/node/parse_ids.ex:240: Absinthe.Relay.Node.ParseIDs.find_schema_root!/2
       (absinthe_relay) lib/absinthe/relay/node/parse_ids.ex:216: Absinthe.Relay.Node.ParseIDs.parse/3
       (absinthe_relay) lib/absinthe/relay/node/parse_ids.ex:198: Absinthe.Relay.Node.ParseIDs.call/2
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:230: Absinthe.Phase.Document.Execution.Resolution.reduce_resolution/1
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:185: Absinthe.Phase.Document.Execution.Resolution.do_resolve_field/3
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:170: Absinthe.Phase.Document.Execution.Resolution.do_resolve_fields/6
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:88: Absinthe.Phase.Document.Execution.Resolution.walk_result/5
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:280: Absinthe.Phase.Document.Execution.Resolution.build_result/3
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:170: Absinthe.Phase.Document.Execution.Resolution.do_resolve_fields/6
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:88: Absinthe.Phase.Document.Execution.Resolution.walk_result/5
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:280: Absinthe.Phase.Document.Execution.Resolution.build_result/3
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:170: Absinthe.Phase.Document.Execution.Resolution.do_resolve_fields/6
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:88: Absinthe.Phase.Document.Execution.Resolution.walk_result/5
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:67: Absinthe.Phase.Document.Execution.Resolution.perform_resolution/3
       (absinthe) lib/absinthe/phase/document/execution/resolution.ex:24: Absinthe.Phase.Document.Execution.Resolution.resolve_current/3
       (absinthe) lib/absinthe/pipeline.ex:366: Absinthe.Pipeline.run_phase/3
       (absinthe) lib/absinthe.ex:103: Absinthe.run/3
       test/lib/absinthe/relay/node/parse_ids_test.exs:520: (test)

[benwilson512]

Ah. Yeah, if you're using the classic form it's expecting :input to be there, but that should be restricted to just mutation fields. Good catch, will fix!