store.rb

{
  :tracks => {
    :uuid1 => {:track_name => "The Sign", :album_name => "The Sign", :artist_id => 1},
    :uuid2 => {:track_name => "Walking On Broken Glass", :album_name => "Diva", :artist_id => 2},
    :uuid3 => {:track_name => "Autumn Leaves", :album_name => "Philosophy", :artist_id => 3}
  }
}

track.rb

class Track
  include DataMapper::Resource
  
  property :track_name, String, :key => true
  property :album_name, String, :key => true
  property :artist_id, Integer, :key => true
end