removes __schema node from a query.

skip_introspection.ex

  defmodule SkipIntrospection do
    @behaviour Absinthe.Phase

    def run(doc, options \\ []) do
      node = Absinthe.Blueprint.prewalk(doc, &handle_node/1)
      {:ok, node}
    end

    defp handle_node(%Absinthe.Blueprint.Document.Operation{} = node) do
      selections =
        node.selections
        |> Enum.reduce([], fn e, acc ->
          if e.schema_node.identifier == :__schema do
            acc
          else
            [e | acc]
          end
        end)
        |> Enum.reverse()

      %{node | selections: selections}
    end

    defp handle_node(node) do
      node
    end
  end