user.rb

class User < ActiveRecord::Base
  attr_accessible :email, :name
  
  validates :email, :presence => true
  validates :name, :presence => true
  validates_uniqueness_of :email, :scope => :user
  
  
  has_many :song_entries
  has_many :songs, :through => :song_entries
  
  require 'open-uri' 
  
  class << self
    def get_data(url)
      doc = Nokogiri::XML(open(url))
      songs = []
      doc.xpath('//rss/channel/item').each do |node|
        songs << { :track   => node.xpath('mm:Track/dc:title').text.strip.downcase,
                   :artist  => node.xpath('mm:Artist/dc:title').text.strip.downcase,
                   :artwork => node.xpath('albumArtUrl').text.strip }
      populate(songs.last)
      end
      
    end

    def populate(songs)
        song = Song.find_or_create_by_track_and_artist_and_artworkUrl( 
                 :track      => songs[:track],
                 :artist     => songs[:artist],
                 :artworkUrl => songs[:artwork]
                )
                song_entries.find_or_create_by_song_id(
                  :song_id => song.id)
    end
  end
end