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lib/construct/types/enum.ex
defmodule Construct.Types.Enum do
@moduledoc """
Implements an abstract enum type.
## Usage
defmodule MyApp.Order do
use Construct do
field :type, {Construct.Types.Enum, [:delivery, :pickup]}
end
end
Then you can validate that `:type` field accepts only specified
values.
iex> MyApp.Order.make(%{type: :delivery})
{:ok, %MyApp.Order{type: :delivery}}
iex> MyApp.Order.make(%{type: :other})
{:error, %{type: passed_value: :other, valid_values: [:delivery, :pickup]}}
"""
@behaviour Construct.TypeC
@impl true
def castc(value, variants) when is_list(variants) do
if value in variants do
{:ok, value}
else
{:error, passed_value: value, valid_values: variants}
end
end
end