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snowhite lib open_weather forecast.ex
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lib/open_weather/forecast.ex 

defmodule OpenWeather.Forecast do

  @keys ~w(city list)a

  defstruct @keys



  alias OpenWeather.Forecast.{City, ForecastItem}

  use Snowhite.Helpers.Decoder, @keys



  def decode_field(_, nil), do: nil

  def decode_field(:city, city), do: City.decode(city)

  def decode_field(:list, list), do: Enum.map(list, &ForecastItem.decode/1)

  def decode_field(_, value), do: value

end