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Schema creation, validation with serialization and deserialization for input data

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parameter lib parameter types datetime.ex
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lib/parameter/types/datetime.ex 

defmodule Parameter.Types.DateTime do

  @moduledoc """

  DateTime parameter type

  """



  use Parameter.Parametrizable



  @impl true

  def load(%DateTime{} = value) do

    {:ok, value}

  end



  def load(value) when is_binary(value) do

    case DateTime.from_iso8601(value) do

      {:error, _reason} -> error_tuple()

      {:ok, date, _offset} -> {:ok, date}

    end

  end



  def load(_value) do

    error_tuple()

  end



  @impl true

  def validate(%DateTime{}) do

    :ok

  end



  def validate(_value) do

    error_tuple()

  end



  defp error_tuple, do: {:error, "invalid datetime type"}

end