Add Album model that inherits Enclosure
user
```ruby
require 'pink_spider'
class Album < Enclosure
  def get_content
    PinkSpider.new.fetch_album(id)
  end

  def fetch_content
    @content = get_content
  end

  def title
    fetch_content if @content.nil?
    "#{@content["title"]} / #{@content["owner_name"]}"
  end

  def permalink_url provider, identifier
    fetch_content if @content.nil?
    @content["url"]
  end
end
```
assistant