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absinthe lib absinthe phase document variables.ex
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lib/absinthe/phase/document/variables.ex 

defmodule Absinthe.Phase.Document.Variables do

  @moduledoc false



  # Provided a set of variable values:

  #

  # - Set the `variables` field on the `Blueprint.Document.Operation.t` to the reconciled

  #   mapping of variable values, supporting defined default values.

  #

  # ## Examples

  #

  # Given a GraphQL document that looks like:

  #

  # ```

  # query Item($id: ID!, $text = String = "Another") {

  #   item(id: $id, category: "Things") {

  #     name

  #   }

  # }

  # ```

  #

  # And this phase configuration:

  #

  # ```

  # run(blueprint, %{"id" => "1234"})

  # ``

  #

  # - The operation's `variables` field would have an `"id"` value set to

  #   `%Blueprint.Input.String{value: "1234"}`

  # - The operation's `variables` field would have an `"text"` value set to

  #   `%Blueprint.Input.String{value: "Another"}`

  #

  # ```

  # run(blueprint, %{})

  # ```

  #

  # - The operation's `variables` field would have an `"id"` value set to

  #   `nil`

  # - The operation's `variables` field would have an `"text"` value set to

  #   `%Blueprint.Input.String{value: "Another"}`

  #

  # Note that no validation occurs in this phase.



  use Absinthe.Phase

  alias Absinthe.Blueprint



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

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

    variables = options[:variables] || %{}

    {:ok, update_operations(input, variables)}

  end



  def update_operations(input, variables) do

    operations =

      for op <- input.operations do

        update_operation(op, variables)

      end



    %{input | operations: operations}

  end



  def update_operation(%{variable_definitions: variable_definitions} = operation, variables) do

    {variable_definitions, provided_values} =

      Enum.map_reduce(variable_definitions, %{}, fn node, acc ->

        provided_value = calculate_value(node, variables)



        {

          %{node | provided_value: provided_value},

          Map.put(acc, node.name, provided_value)

        }

      end)



    %{operation | variable_definitions: variable_definitions, provided_values: provided_values}

  end



  defp calculate_value(node, variables) do

    case Map.fetch(variables, node.name) do

      :error ->

        node.default_value



      {:ok, value} ->

        value

        |> preparse_nil

        |> Blueprint.Input.parse()

    end

  end



  defp preparse_nil(nil), do: %Blueprint.Input.Null{}

  defp preparse_nil(other), do: other

end