gistfile1.rb

class Song < ActiveRecord::Base
  attr_accessible :artist, :artwork, :category, :credits, :tag_list, :title, :track, :year 
  
  belongs_to :user
  
  has_many :albumizations
  has_many :albums, :through => :albumizations
    
  validates_presence_of :user_id
  validates_presence_of :title
  
  acts_as_taggable
  
  mount_uploader :track, TrackUploader
  
  after_save :enqueue_track

  def track_name
    File.basename(track.path || track.filename) if track
  end

  def enqueue_track
    TrackWorker.perform_async(id, key) if key.present?
  end

  class TrackWorker
    include Sidekiq::Worker

    def perform(id, key)
      song = Song.find(id)
      song.key = key
      song.remote_track_url = song.track.direct_fog_url(with_path: true)
      song.save!
      song.update_column(:track_processed, true)
    end
  end
end