has_image_helper.ex

defmodule App.ModelHelpers.HasImageHelper do

  alias App.Repo
  alias App.Image

  defmacro __using__(_) do
    quote do

      def get_image_url(model, field, base_path \\ "", default_image \\ nil) do
        field = if is_bitstring(field), do: String.to_atom(field), else: field
        image_id = Map.get(model, field)

        unless is_nil(image_id) do
          image = Repo.get!(Image, image_id)          
          Image.url(image)
        else
          get_default_image(default_image)
        end
      end

      def has_image?(model, field) do
        !is_nil(model.field)
      end

      #defp get_default_image(default_image) when is_function(default_image), do: default_image()
      defp get_default_image(default_image), do: default_image


    end
  end


end