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absinthe lib absinthe phase document missing_variables.ex
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lib/absinthe/phase/document/missing_variables.ex 

defmodule Absinthe.Phase.Document.MissingVariables do

  @moduledoc false



  # Fills out missing arguments and input object fields.

  #

  # Filling out means inserting a stubbed `Input.Argument` or `Input.Field` struct.

  #

  # Only those arguments which are non null and / or have a default value are filled

  # out.

  #

  # If an argument or input object field is non null and missing, it is marked invalid



  use Absinthe.Phase

  alias Absinthe.{Blueprint, Type}



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

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

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

    {:ok, node}

  end



  defp handle_node(%Blueprint.Input.Argument{schema_node: schema_node, input_value: %{normalized: nil}} = node) do

    handle_defaults(node, schema_node)

  end

  defp handle_node(%Blueprint.Input.Field{schema_node: schema_node, input_value: %{normalized: nil}} = node) do

    handle_defaults(node, schema_node)

  end

  defp handle_node(node), do: node



  defp handle_defaults(node, schema_node) do

    case schema_node do

      %{default_value: val} when not is_nil(val) ->

        fill_default(node, val)

      %{deprecation: %{}} ->

        node

      %{type: %Type.NonNull{}} ->

        node |> flag_invalid(:missing)

      _ ->

        node

    end

  end



  defp fill_default(%{input_value: input} = node, val) do

    input = %{input | data: val, normalized: %Blueprint.Input.Generated{by: __MODULE__}}

    %{node | input_value: input}

  end

end