Fix #785 - improve album handling when storing favorites

* use unique `extid` to identify albums imported from an online service
* use artist name in addition to album title to identify locally stored albums

Changelog8.html

@@ -21,6 +21,7 @@ <h2><a name="v8.3.0" id="v8.3.0"></a>Version 8.3.0</h2>
 		<li><a href="https://github.com/Logitech/slimserver/pull/708">#708</a> - Update to MP3, FLAC, Ogg and WMA Formats to use BPM tags - thanks kwarklabs!</li>
 		<li><a href="https://github.com/Logitech/slimserver/pull/751">#751</a> - Shuffle tracks added with "playlist loadtracks" for a given year (thanks philchillbill!)</li>
 		<li><a href="https://github.com/Logitech/slimserver/pull/758">#758</a> - Allow selection of regional language (eg. ZH_CH or EN_GB) through JSONRPC (thanks expectingtofly!)</li>
+		<li><a href="https://github.com/Logitech/slimserver/issues/785">#785</a> - Improve adding albums as favorites: don't rely on the album title alone, but use the artist to identify the album, too.</li>
 		<li>Remove support for media types other than audio (video, pictures).</li>
 		<li>Remove more legacy plugins: Amazon, MP3Tunes, Orange, YALP</li>
 	</ul>

Slim/Menu/BrowseLibrary.pm

@@ -1452,11 +1452,11 @@ sub _albums {
 				$_->{'playlist'}      = \&_tracks;
 				$_->{'url'}           = \&_tracks;
 				$_->{'passthrough'}   = [ { searchTags => [@searchTags, "album_id:" . $_->{'id'}], sort => 'sort:tracknum', remote_library => $remote_library } ];
-				# the favorites url is the album title here
+				# the favorites url is the album title and contributor name here (or extid for online albums)
 				# album id would be (much) better, but that would screw up the favorite on a rescan
 				# title is a really stupid thing to use, since there's no assurance it's unique
-				$_->{'favorites_url'} = 'db:album.title=' .
-						URI::Escape::uri_escape_utf8( $_->{'name'} );
+				$_->{'favorites_url'} = $_->{'extid'}
+					|| sprintf('db:album.title=%s&contributor.name=%s', URI::Escape::uri_escape_utf8($_->{'name'}), URI::Escape::uri_escape_utf8( $_->{'artist'}));
 
 				if ($_->{'artist_ids'}) {
 					$_->{'artists'} = $_->{'artist_ids'} =~ /,/ ? [ split /(?<!\s),(?!\s)/, $_->{'artists'} ] : [ $_->{'artists'} ];

Slim/Player/ProtocolHandlers.pm

@@ -26,7 +26,7 @@ my %protocolHandlers = (
 	spdr     => qw(Slim::Player::Protocols::SqueezePlayDirect),
 	http     => qw(Slim::Player::Protocols::HTTP),
 	https    => qw(Slim::Player::Protocols::HTTPS),
-	icy      => qw(Slim::Player::Protocols::HTTP),	
+	icy      => qw(Slim::Player::Protocols::HTTP),
 	playlist => 0,
 	db       => 1,
 );
@@ -155,15 +155,30 @@ sub iconForURL {
 		return 'html/images/playlists.png';
 	}
 
-	elsif ($url =~ /^db:album\.(\w+)=(.+)/) {
-		my $value = Slim::Utils::Misc::unescape($2);
+	elsif ($url =~ /^db:(album\..*)/) {
+		my $query = {};
+		for my $term (split('&', $1)) {
+			if ($term =~ /(.*)=(.*)/) {
+				my $key = $1;
+				my $value = Slim::Utils::Misc::unescape($2);
 
-		if (utf8::is_utf8($value)) {
-			utf8::decode($value);
-			utf8::encode($value);
+				$key =~ s/^album\./me./;
+
+				if (utf8::is_utf8($value)) {
+					utf8::decode($value);
+					utf8::encode($value);
+				}
+
+				$query->{$key} = $value;
+			}
+		}
+
+		my $params;
+		if (grep /^contributor/, keys %$query) {
+			$params->{prefetch} = 'contributor';
 		}
 
-		my $album = Slim::Schema->search('Album', { $1 => $value })->first;
+		my $album = Slim::Schema->search('Album', $query, $params)->first;
 
 		if ($album && $album->artwork) {
 			return 'music/' . $album->artwork . '/cover.png';