Merge pull request #17 from lionelerard/master

Adds release group urls

README.md

@@ -93,7 +93,8 @@ MusicBrainz::ReleaseGroup.search(artist_name, title, type: 'Album')
   :type               => String,
   :title              => String,
   :desc               => String,
-  :first_release_date => Date
+  :first_release_date => Date,
+  :urls               => Hash
 }
 ```
 

lib/musicbrainz/bindings/release_group.rb

@@ -8,7 +8,10 @@ module MusicBrainz
           type: (xml.attribute('type').value rescue nil),
           title: (xml.xpath('./title').text rescue nil),
           desc: (xml.xpath('./disambiguation').text rescue nil),
-          first_release_date: (xml.xpath('./first-release-date').text rescue nil)
+          first_release_date: (xml.xpath('./first-release-date').text rescue nil),
+          urls: (Hash[xml.xpath('./relation-list[@target-type="url"]/relation').map{ |xml|
+            [xml.attribute('type').value.downcase.split(" ").join("_").to_sym, xml.xpath('./target').text]
+          }] rescue {})
         }
       end
 

lib/musicbrainz/models/artist.rb

@@ -9,7 +9,7 @@ module MusicBrainz
     field :urls, Hash
 
     def release_groups
-      @release_groups ||= client.load(:release_group, { artist: id }, {
+      @release_groups ||= client.load(:release_group, { artist: id, inc: [:url_rels] }, {
         binding: :artist_release_groups,
         create_models: :release_group,
         sort: :first_release_date

lib/musicbrainz/models/release_group.rb

@@ -5,6 +5,7 @@ module MusicBrainz
     field :title, String
     field :desc, String
     field :first_release_date, Date
+    field :urls, Hash
 
     alias_method :disambiguation, :desc
 
@@ -18,7 +19,7 @@ module MusicBrainz
 
     class << self
       def find(id)
-        client.load(:release_group, { id: id }, {
+        client.load(:release_group, { id: id, inc: [:url_rels] }, {
           binding: :release_group,
           create_model: :release_group
         })

spec/models/artist_spec.rb

@@ -56,5 +56,6 @@ describe MusicBrainz::Artist do
     release_groups.first.type.should == "Single"
     release_groups.first.title.should == "Club Foot"
     release_groups.first.first_release_date.should == Date.new(2004, 5, 10)
+    release_groups.first.urls[:discogs].should == 'http://www.discogs.com/master/125150'
   end
 end

spec/models/release_group_spec.rb

@@ -21,6 +21,7 @@ describe MusicBrainz::ReleaseGroup do
       release_group.type.should == "Album"
       release_group.title.should == "Empire"
       release_group.first_release_date.should == Date.new(2006, 8, 28)
+      release_group.urls[:wikipedia].should == 'http://en.wikipedia.org/wiki/Empire_(Kasabian_album)'
     end
   end