has_image_helper2.ex

defmodule App.ModelHelpers.HasImageHelper do

  alias App.Repo
  alias App.Image

  import Ecto.Changeset, only: [cast: 3]

  defmacro __using__(config) do

    quote do
      @conf unquote(config)
      def get_image_url(model, field, options \\ %{}) 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)
          width = options[:width]
          height = options[:height]
          url = if width || height do
            {:ok, image} = Image.resized_image(image, width, height)
            Image.url(image)
          else
            Image.url(image)
          end
          url
        else
          get_default_image(@conf[: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

      def save_uploaded_image(model, file, attr \\ :image_id) do
        type = to_string(__MODULE__)
        type = String.split(type, ".")
          |> List.last
          |> Macro.underscore
        {:ok, image} = Image.create_from_file(file.path, type, file.filename)
        params = %{}
        params = Map.put(params, attr, image.id)        
        changeset = cast(model, params, [to_string(attr)])
        user = Repo.update!(changeset)
        user
      end

    end
  end


end