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absinthe lib absinthe phase document arguments coerce_lists.ex
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lib/absinthe/phase/document/arguments/coerce_lists.ex 

defmodule Absinthe.Phase.Document.Arguments.CoerceLists do

  @moduledoc false



  # Coerce non-list inputs to lists when appropriate.

  #

  # IE

  # ```

  # foo(ids: 1)

  # ```

  # becomes

  # ```

  # foo(ids: [1])

  # ```

  #

  # if `ids` is a list type.



  use Absinthe.Phase

  alias Absinthe.{Blueprint, Type}

  alias Absinthe.Blueprint.Input



  @spec run(Blueprint.t, Keyword.t) :: {:ok, Blueprint.t}

  def run(input, _options \\ []) do

    node = Blueprint.prewalk(input, &coerce_node/1)

    {:ok, node}

  end



  defp coerce_node(%Input.Value{normalized: nil} = node), do: node

  defp coerce_node(%Input.Value{} = node) do

    case Type.unwrap_non_null(node.schema_node) do

      %Type.List{} ->

        %{node | normalized: Input.List.wrap(node.normalized, node.schema_node)}

      _ ->

        node

    end

  end

  defp coerce_node(node), do: node



end