Error with schemas defined via macro with modern payloads

[avitex]

Based on this comment.

With this macro

defmodule SupportingSchema do
  defmacro __using__(flavor) do
    quote do
      use Absinthe.Schema
      use Absinthe.Relay.Schema, unquote(flavor)

      # ...
      
      mutation do
        payload field :update_foo do
          input do
            field :foo, :string
          end
          output do
            field :foo, :string
          end
          resolve fn %{foo: foo}, _ -> {:ok, %{foo: foo}} end
        end
      end

      # ...

    end
  end
end

And this definition

defmodule SchemaModern do
  use SupportingSchema, :modern # Classic works (assuming you also account for clientMutationId)
end

This query

"""
mutation updateFoo {
  updateFoo(input: {foo: "bar"}) {
    foo
  }
}
"""
|> Absinthe.run(SchemaModern)

Fails with

{:ok,
 %{errors: [%{locations: [],
      message: "Unknown argument \"input\" on field \"updateFoo\" of type \"RootMutationType\"."}]}}

[bruce]

@avitex To clarify, is this only present with the changes in #96?

[avitex]

Nope, this is with master. I only discovered it while I was working on refactoring the tests in that PR.
Note that PR can be merged. The solution with the test works, once this this issue is resolved I'll continue refactoring the tests.