Implements MusicBrainz::ReleaseGroup.search and .find_by_artist_and_title

lib/musicbrainz.rb

@@ -24,6 +24,7 @@ require "musicbrainz/bindings/artist"
 require "musicbrainz/bindings/artist_search"
 require "musicbrainz/bindings/artist_release_groups"
 require "musicbrainz/bindings/release_group"
+require "musicbrainz/bindings/release_group_search"
 require "musicbrainz/bindings/release_group_releases"
 require "musicbrainz/bindings/release"
 require "musicbrainz/bindings/release_tracks"

lib/musicbrainz/bindings/release_group_search.rb

@@ -0,0 +1,20 @@
+# encoding: UTF-8
+module MusicBrainz
+  module Bindings
+    module ReleaseGroupSearch
+      def parse(xml)
+        xml.xpath('./release-group-list/release-group').map do |xml|
+          {
+            id: (xml.attribute('id').value rescue nil),
+            mbid: (xml.attribute('id').value rescue nil), # Old shit
+            title: (xml.xpath('./title').text.gsub(/[`’]/, "'") rescue nil),
+            type: (xml.attribute('type').value rescue nil),
+            score: (xml.attribute('score').value.to_i rescue nil)
+          } rescue nil
+        end.delete_if{ |item| item.nil? }
+      end
+
+      extend self
+    end
+  end
+end

lib/musicbrainz/models/release_group.rb

@@ -23,6 +23,23 @@ module MusicBrainz
           create_model: :release_group
         })
       end
+      
+      def search(artist_name, title, options = {})
+        artist_name = CGI.escape(artist_name).gsub(/\!/, '\!')
+        title = CGI.escape(title).gsub(/\!/, '\!')
+        query = ["artist:\"#{artist_name}\"", "releasegroup:\"#{title}\""]
+        query << "type: #{options[:type]}" if options[:type]
+
+        client.load(
+          :release_group, { query: query.join(' AND '), limit: 10 }, 
+          { binding: :release_group_search }
+        )
+      end
+      
+      def find_by_artist_and_title(artist_name, title, options = {})
+        matches = search(artist_name, title, options)
+        matches.empty? ? nil : find(matches.first[:id])
+      end
     end
   end
 end