Refactored Release and Track models, fixed tests

lib/parsers/release.rb

@@ -6,7 +6,7 @@ module MusicBrainz
       class << self
         def model(xml)
           {
-            :id => safe_get_attr(xml, nil, "id") || safe_get_attr(xml, "release-group", "id"),
+            :id => safe_get_attr(xml, nil, "id") || safe_get_attr(xml, "release", "id"),
             :title => safe_get_value(xml, "title"),
             :status => safe_get_value(xml, "status"),
             :country => safe_get_value(xml, "country"),
@@ -14,6 +14,14 @@ module MusicBrainz
             :date => safe_get_value(xml, "date")
           }
         end
+
+        def tracks(xml)
+          tracks = []
+          xml.css("medium-list > medium > track-list > track").each do |r|
+            tracks << MusicBrainz::Parsers::Track.model(r)
+          end
+          tracks
+        end
       end
     end
   end

lib/parsers/track.rb

@@ -4,7 +4,14 @@ module MusicBrainz
   module Parsers
     class Track < Base
       class << self
-
+        def model(xml)
+          {
+            :position => safe_get_value(xml, "position"),
+            :recording_id => safe_get_attr(xml, "recording", "id"),
+            :title => safe_get_value(xml, "recording > title"),
+            :length => safe_get_value(xml, "length") || safe_get_value(xml, "recording > length")
+          }
+        end
       end
     end
   end