dragon fly helper

one.rb

  def thumb_url photo, size
    case photo
    when ImageUploader
      if Rails.env.development?
        path = photo.path
      else
        path = photo.url
      end
    when String
      path = photo
    else
      raise "Unknown photo type #{photo.class}"
    end

    if path.starts_with? 'http'
      Dragonfly.app.fetch_url(path).thumb(size).url
    else
      Dragonfly.app.fetch_file(path).thumb(size).url
    end
  end