guard.exs

defp from_model(resource) when is_map(resource) do
  resource.__struct__ 
  |> extract 
end

defp from_model(resource) do
  resource
  |> extract 
end

defp extract(resource) do
  resource
  |> Mix.Utils.underscore
  |> String.split("/")
  |> List.last
  |> to_string
end

om nog cleaner in de module de externals importeren

import String,    only: [split: 2]
import Mix.Utils, only: [underscore: 1]
import List,      only: [last: 1]