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Schema creation, validation with serialization and deserialization for input data

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parameter lib parameter types decimal.ex
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lib/parameter/types/decimal.ex 

if Code.ensure_loaded?(Decimal) do

  defmodule Parameter.Types.Decimal do

    @moduledoc """

    Decimal parameter type.

    Include the Decimal library on your application to use this type:

        def deps do

          [

            {:parameter, "~> ..."},

            {:decimal, "~> 2.0"}

          ]

        end

    """



    use Parameter.Parametrizable



    @impl true

    def load(value) do

      case Decimal.cast(value) do

        :error -> error_tuple()

        {:ok, decimal} -> {:ok, decimal}

      end

    end



    @impl true

    def validate(%Decimal{}) do

      :ok

    end



    def validate(_value) do

      error_tuple()

    end



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

  end

end