Handle different cases of release's format attribute.

lib/musicbrainz/bindings/release.rb

@@ -3,14 +3,23 @@ module MusicBrainz
     module Release
       def parse(xml)
         xml = xml.xpath('./release') unless xml.xpath('./release').empty?
-        {
+        
+        hash = {
           id: (xml.attribute('id').value rescue nil),
           title: (xml.xpath('./title').text rescue nil),
           status: (xml.xpath('./status').text rescue nil),
           country: (xml.xpath('./country').text rescue nil),
-          format: (xml.xpath('./medium-list/medium/format').text rescue nil),
           date: (xml.xpath('./date').text rescue nil)
         }
+        
+        formats = (xml.xpath('./medium-list/medium/format') rescue []).map(&:text)
+        
+        hash[:format] = formats.uniq.map do |format|
+          format_count = formats.select{|f| f == format}.length
+          format_count == 1 ? format : "#{format_count}x#{format}"
+        end.join(' + ')
+        
+        hash
       end
 
       extend self

spec/bindings/release_spec.rb

@@ -0,0 +1,43 @@
+# -*- encoding: utf-8 -*-
+
+require "spec_helper"
+
+describe MusicBrainz::Bindings::Release do
+  describe '.parse' do
+    describe 'attributes' do
+      describe 'format' do
+        context 'single cd' do
+          it 'returns CD' do
+            response = '<release><medium-list count="1"><medium><format>CD</format></medium></medium-list></release>'
+            xml = Nokogiri::XML.parse(response)
+            described_class.parse(xml)[:format].should == 'CD'
+          end
+        end
+        
+        context 'multiple cds' do
+          it 'returns 2xCD' do
+            response = '<release><medium-list count="2"><medium><format>CD</format><track-list count="11" /></medium><medium><title>bonus disc</title><format>CD</format></medium></medium-list></release>'
+            xml = Nokogiri::XML.parse(response)
+            described_class.parse(xml)[:format].should == '2xCD'
+          end
+        end
+        
+        context 'different formats' do
+          it 'returns DVD + CD' do
+            response = '<release><medium-list count="2"><medium><format>DVD</format></medium><medium><format>CD</format></medium></medium-list></release>'
+            xml = Nokogiri::XML.parse(response)
+            described_class.parse(xml)[:format].should == 'DVD + CD'
+          end
+        end
+        
+        context 'different formats plus multiple mediums with same format' do
+          it 'returns 2xCD + DVD' do
+            response = '<release><medium-list count="2"><medium><format>CD</format></medium><medium><format>CD</format></medium><medium><format>DVD</format></medium></medium-list></release>'
+            xml = Nokogiri::XML.parse(response)
+            described_class.parse(xml)[:format].should == '2xCD + DVD'
+          end
+        end
+      end
+    end
+  end
+end