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snowhite lib open_weather weather weather_item.ex
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lib/open_weather/weather/weather_item.ex 

defmodule OpenWeather.Weather.WeatherItem do

  @keys ~w(id main description icon)a

  defstruct @keys

  use Starchoice.Decoder

  alias __MODULE__



  defdecoder do

    Enum.map(@keys, &field/1)

  end



  def icon_url(%WeatherItem{icon: icon}, size \\ "@2x") do

    "https://openweathermap.org/img/wn/#{icon}#{size}.png"

  end

end