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graphqexl

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Fully-loaded, pure-Elixir GraphQL server implementation with developer tools

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graphqexl lib graphqexl schema ref.ex
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lib/graphqexl/schema/ref.ex 

alias Graphqexl.Schema.{

  Field,

  Interface,

  Type,

  Union,

}



defmodule Graphqexl.Schema.Ref do

  @moduledoc """

  Ref struct, representing a connection to another user-defined type

  (that may not yet actually be defined in the run-time context)

  """

  @moduledoc since: "0.1.0"

  defstruct type: %{}



  @type component:: Interface.t | Type.t | Union.t



  @type t:: %Graphqexl.Schema.Ref{type: atom}



  @placeholder %{}



  @doc """

  Returns a list of the `t:Graphqexl.Schema.Field.t/0`s available on the type resolved to by the

  given `t:Graphqexl.Schema.Ref.t/0`.



  Returns: `[t:Graphqexl.Schema.Field.t/0]`

  """

  @doc since: "0.1.0"

  @spec fields(t) :: list(Field.t)

  def fields(ref) do

    case ref.type do

      :Interface -> ref.type |> Interface.fields

      :Type -> ref.type |> Type.fields

      :Union -> ref.type |> Union.fields

      _ -> raise "Unknown ref type! Got: #{ref.type}}"

    end

  end



  @doc """

  Resolves the given `t:Graphqexl.Schema.Ref.t/0` into its corresponding

  `t:Graphqexl.Schema.Ref.component/0`.



  Returns: `t:Graphqexl.Schema.Ref.component/0`

  """

  @doc since: "0.1.0"

  @spec resolve(t) :: component

  # TODO: fully implement

  def resolve(ref), do: @placeholder |> Map.get(ref.type)

end