Split artist/album metadata from collection

src/core/collection/album.rs

@@ -12,20 +12,26 @@ use crate::core::collection::{
 /// An album is a collection of tracks that were released together.
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Album {
+    pub meta: AlbumMeta,
+    pub tracks: Vec<Track>,
+}
+
+/// Album metadata.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct AlbumMeta {
     pub id: AlbumId,
     pub date: AlbumDate,
     pub seq: AlbumSeq,
     pub musicbrainz: Option<MbAlbumRef>,
     pub primary_type: Option<AlbumPrimaryType>,
     pub secondary_types: Vec<AlbumSecondaryType>,
-    pub tracks: Vec<Track>,
 }
 
 impl WithId for Album {
     type Id = AlbumId;
 
     fn id(&self) -> &Self::Id {
-        &self.id
+        &self.meta.id
     }
 }
 
@@ -139,18 +145,20 @@ impl Album {
         secondary_types: Vec<AlbumSecondaryType>,
     ) -> Self {
         Album {
+            meta: AlbumMeta {
                 id: id.into(),
                 date: date.into(),
                 seq: AlbumSeq::default(),
                 musicbrainz: None,
                 primary_type,
                 secondary_types,
+            },
             tracks: vec![],
         }
     }
 
     pub fn get_sort_key(&self) -> (&AlbumDate, &AlbumSeq, &AlbumId) {
-        (&self.date, &self.seq, &self.id)
+        (&self.meta.date, &self.meta.seq, &self.meta.id)
     }
 
     pub fn get_status(&self) -> AlbumStatus {
@@ -158,19 +166,19 @@ impl Album {
     }
 
     pub fn set_seq(&mut self, seq: AlbumSeq) {
-        self.seq = seq;
+        self.meta.seq = seq;
     }
 
     pub fn clear_seq(&mut self) {
-        self.seq = AlbumSeq::default();
+        self.meta.seq = AlbumSeq::default();
     }
 
     pub fn set_musicbrainz_ref(&mut self, mbref: MbAlbumRef) {
-        _ = self.musicbrainz.insert(mbref);
+        _ = self.meta.musicbrainz.insert(mbref);
     }
 
     pub fn clear_musicbrainz_ref(&mut self) {
-        _ = self.musicbrainz.take();
+        _ = self.meta.musicbrainz.take();
     }
 }
 
@@ -188,12 +196,14 @@ impl Ord for Album {
 
 impl Merge for Album {
     fn merge_in_place(&mut self, other: Self) {
-        assert_eq!(self.id, other.id);
-        self.seq = std::cmp::max(self.seq, other.seq);
+        assert_eq!(self.meta.id, other.meta.id);
+        self.meta.seq = std::cmp::max(self.meta.seq, other.meta.seq);
 
-        self.musicbrainz = self.musicbrainz.take().or(other.musicbrainz);
-        self.primary_type = self.primary_type.take().or(other.primary_type);
-        self.secondary_types.merge_in_place(other.secondary_types);
+        self.meta.musicbrainz = self.meta.musicbrainz.take().or(other.meta.musicbrainz);
+        self.meta.primary_type = self.meta.primary_type.take().or(other.meta.primary_type);
+        self.meta
+            .secondary_types
+            .merge_in_place(other.meta.secondary_types);
 
         let tracks = mem::take(&mut self.tracks);
         self.tracks = MergeSorted::new(tracks.into_iter(), other.tracks.into_iter()).collect();
@@ -266,28 +276,28 @@ mod tests {
     fn set_clear_seq() {
         let mut album = Album::new("An album", AlbumDate::default(), None, vec![]);
 
-        assert_eq!(album.seq, AlbumSeq(0));
+        assert_eq!(album.meta.seq, AlbumSeq(0));
 
         // Setting a seq on an album.
         album.set_seq(AlbumSeq(6));
-        assert_eq!(album.seq, AlbumSeq(6));
+        assert_eq!(album.meta.seq, AlbumSeq(6));
 
         album.set_seq(AlbumSeq(6));
-        assert_eq!(album.seq, AlbumSeq(6));
+        assert_eq!(album.meta.seq, AlbumSeq(6));
 
         album.set_seq(AlbumSeq(8));
-        assert_eq!(album.seq, AlbumSeq(8));
+        assert_eq!(album.meta.seq, AlbumSeq(8));
 
         // Clearing seq.
         album.clear_seq();
-        assert_eq!(album.seq, AlbumSeq(0));
+        assert_eq!(album.meta.seq, AlbumSeq(0));
     }
 
     #[test]
     fn merge_album_no_overlap() {
         let left = FULL_COLLECTION[0].albums[0].to_owned();
         let mut right = FULL_COLLECTION[0].albums[1].to_owned();
-        right.id = left.id.clone();
+        right.meta.id = left.meta.id.clone();
 
         let mut expected = left.clone();
         expected.tracks.append(&mut right.tracks.clone());
@@ -305,7 +315,7 @@ mod tests {
     fn merge_album_overlap() {
         let mut left = FULL_COLLECTION[0].albums[0].to_owned();
         let mut right = FULL_COLLECTION[0].albums[1].to_owned();
-        right.id = left.id.clone();
+        right.meta.id = left.meta.id.clone();
         left.tracks.push(right.tracks[0].clone());
         left.tracks.sort_unstable();
 
@@ -328,23 +338,23 @@ mod tests {
         let mut album = Album::new(AlbumId::new("an album"), AlbumDate::default(), None, vec![]);
 
         let mut expected: Option<MbAlbumRef> = None;
-        assert_eq!(album.musicbrainz, expected);
+        assert_eq!(album.meta.musicbrainz, expected);
 
         // Setting a URL on an album.
         album.set_musicbrainz_ref(MbAlbumRef::from_url_str(MUSICBRAINZ).unwrap());
         _ = expected.insert(MbAlbumRef::from_url_str(MUSICBRAINZ).unwrap());
-        assert_eq!(album.musicbrainz, expected);
+        assert_eq!(album.meta.musicbrainz, expected);
 
         album.set_musicbrainz_ref(MbAlbumRef::from_url_str(MUSICBRAINZ).unwrap());
-        assert_eq!(album.musicbrainz, expected);
+        assert_eq!(album.meta.musicbrainz, expected);
 
         album.set_musicbrainz_ref(MbAlbumRef::from_url_str(MUSICBRAINZ_2).unwrap());
         _ = expected.insert(MbAlbumRef::from_url_str(MUSICBRAINZ_2).unwrap());
-        assert_eq!(album.musicbrainz, expected);
+        assert_eq!(album.meta.musicbrainz, expected);
 
         // Clearing URLs.
         album.clear_musicbrainz_ref();
         _ = expected.take();
-        assert_eq!(album.musicbrainz, expected);
+        assert_eq!(album.meta.musicbrainz, expected);
     }
 }

src/core/collection/artist.rs

@@ -13,18 +13,24 @@ use crate::core::collection::{
 /// An artist.
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Artist {
+    pub meta: ArtistMeta,
+    pub albums: Vec<Album>,
+}
+
+/// Artist metadata.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct ArtistMeta {
     pub id: ArtistId,
     pub sort: Option<ArtistId>,
     pub musicbrainz: Option<MbArtistRef>,
     pub properties: HashMap<String, Vec<String>>,
-    pub albums: Vec<Album>,
 }
 
 impl WithId for Artist {
     type Id = ArtistId;
 
     fn id(&self) -> &Self::Id {
-        &self.id
+        &self.meta.id
     }
 }
 
@@ -38,32 +44,34 @@ impl Artist {
     /// Create new [`Artist`] with the given [`ArtistId`].
     pub fn new<Id: Into<ArtistId>>(id: Id) -> Self {
         Artist {
+            meta: ArtistMeta {
                 id: id.into(),
                 sort: None,
                 musicbrainz: None,
                 properties: HashMap::new(),
+            },
             albums: vec![],
         }
     }
 
     pub fn get_sort_key(&self) -> (&ArtistId,) {
-        (self.sort.as_ref().unwrap_or(&self.id),)
+        (self.meta.sort.as_ref().unwrap_or(&self.meta.id),)
     }
 
     pub fn set_sort_key<SORT: Into<ArtistId>>(&mut self, sort: SORT) {
-        self.sort = Some(sort.into());
+        self.meta.sort = Some(sort.into());
     }
 
     pub fn clear_sort_key(&mut self) {
-        _ = self.sort.take();
+        _ = self.meta.sort.take();
     }
 
     pub fn set_musicbrainz_ref(&mut self, mbref: MbArtistRef) {
-        _ = self.musicbrainz.insert(mbref);
+        _ = self.meta.musicbrainz.insert(mbref);
     }
 
     pub fn clear_musicbrainz_ref(&mut self) {
-        _ = self.musicbrainz.take();
+        _ = self.meta.musicbrainz.take();
     }
 
     // In the functions below, it would be better to use `contains` instead of `iter().any`, but for
@@ -71,7 +79,7 @@ impl Artist {
     // https://stackoverflow.com/questions/48985924/why-does-a-str-not-coerce-to-a-string-when-using-veccontains
 
     pub fn add_to_property<S: AsRef<str> + Into<String>>(&mut self, property: S, values: Vec<S>) {
-        match self.properties.get_mut(property.as_ref()) {
+        match self.meta.properties.get_mut(property.as_ref()) {
             Some(container) => {
                 container.append(
                     &mut values
@@ -82,7 +90,7 @@ impl Artist {
                 );
             }
             None => {
-                self.properties.insert(
+                self.meta.properties.insert(
                     property.into(),
                     values.into_iter().map(|s| s.into()).collect(),
                 );
@@ -91,23 +99,23 @@ impl Artist {
     }
 
     pub fn remove_from_property<S: AsRef<str>>(&mut self, property: S, values: Vec<S>) {
-        if let Some(container) = self.properties.get_mut(property.as_ref()) {
+        if let Some(container) = self.meta.properties.get_mut(property.as_ref()) {
             container.retain(|val| !values.iter().any(|x| x.as_ref() == val));
             if container.is_empty() {
-                self.properties.remove(property.as_ref());
+                self.meta.properties.remove(property.as_ref());
             }
         }
     }
 
     pub fn set_property<S: AsRef<str> + Into<String>>(&mut self, property: S, values: Vec<S>) {
-        self.properties.insert(
+        self.meta.properties.insert(
             property.into(),
             values.into_iter().map(|s| s.into()).collect(),
         );
     }
 
     pub fn clear_property<S: AsRef<str>>(&mut self, property: S) {
-        self.properties.remove(property.as_ref());
+        self.meta.properties.remove(property.as_ref());
     }
 }
 
@@ -125,11 +133,11 @@ impl Ord for Artist {
 
 impl Merge for Artist {
     fn merge_in_place(&mut self, other: Self) {
-        assert_eq!(self.id, other.id);
+        assert_eq!(self.meta.id, other.meta.id);
 
-        self.sort = self.sort.take().or(other.sort);
-        self.musicbrainz = self.musicbrainz.take().or(other.musicbrainz);
-        self.properties.merge_in_place(other.properties);
+        self.meta.sort = self.meta.sort.take().or(other.meta.sort);
+        self.meta.musicbrainz = self.meta.musicbrainz.take().or(other.meta.musicbrainz);
+        self.meta.properties.merge_in_place(other.meta.properties);
 
         let albums = mem::take(&mut self.albums);
         self.albums = MergeCollections::merge_iter(albums, other.albums);
@@ -181,32 +189,32 @@ mod tests {
 
         let mut artist = Artist::new(&artist_id.name);
 
-        assert_eq!(artist.id, artist_id);
-        assert_eq!(artist.sort, None);
+        assert_eq!(artist.meta.id, artist_id);
+        assert_eq!(artist.meta.sort, None);
         assert_eq!(artist.get_sort_key(), (&artist_id,));
         assert!(artist < Artist::new(sort_id_1.clone()));
         assert!(artist < Artist::new(sort_id_2.clone()));
 
         artist.set_sort_key(sort_id_1.clone());
 
-        assert_eq!(artist.id, artist_id);
-        assert_eq!(artist.sort.as_ref(), Some(&sort_id_1));
+        assert_eq!(artist.meta.id, artist_id);
+        assert_eq!(artist.meta.sort.as_ref(), Some(&sort_id_1));
         assert_eq!(artist.get_sort_key(), (&sort_id_1,));
         assert!(artist > Artist::new(artist_id.clone()));
         assert!(artist < Artist::new(sort_id_2.clone()));
 
         artist.set_sort_key(sort_id_2.clone());
 
-        assert_eq!(artist.id, artist_id);
-        assert_eq!(artist.sort.as_ref(), Some(&sort_id_2));
+        assert_eq!(artist.meta.id, artist_id);
+        assert_eq!(artist.meta.sort.as_ref(), Some(&sort_id_2));
         assert_eq!(artist.get_sort_key(), (&sort_id_2,));
         assert!(artist > Artist::new(artist_id.clone()));
         assert!(artist > Artist::new(sort_id_1.clone()));
 
         artist.clear_sort_key();
 
-        assert_eq!(artist.id, artist_id);
-        assert_eq!(artist.sort, None);
+        assert_eq!(artist.meta.id, artist_id);
+        assert_eq!(artist.meta.sort, None);
         assert_eq!(artist.get_sort_key(), (&artist_id,));
         assert!(artist < Artist::new(sort_id_1.clone()));
         assert!(artist < Artist::new(sort_id_2.clone()));
@@ -217,24 +225,24 @@ mod tests {
         let mut artist = Artist::new(ArtistId::new("an artist"));
 
         let mut expected: Option<MbArtistRef> = None;
-        assert_eq!(artist.musicbrainz, expected);
+        assert_eq!(artist.meta.musicbrainz, expected);
 
         // Setting a URL on an artist.
         artist.set_musicbrainz_ref(MbArtistRef::from_url_str(MUSICBRAINZ).unwrap());
         _ = expected.insert(MbArtistRef::from_url_str(MUSICBRAINZ).unwrap());
-        assert_eq!(artist.musicbrainz, expected);
+        assert_eq!(artist.meta.musicbrainz, expected);
 
         artist.set_musicbrainz_ref(MbArtistRef::from_url_str(MUSICBRAINZ).unwrap());
-        assert_eq!(artist.musicbrainz, expected);
+        assert_eq!(artist.meta.musicbrainz, expected);
 
         artist.set_musicbrainz_ref(MbArtistRef::from_url_str(MUSICBRAINZ_2).unwrap());
         _ = expected.insert(MbArtistRef::from_url_str(MUSICBRAINZ_2).unwrap());
-        assert_eq!(artist.musicbrainz, expected);
+        assert_eq!(artist.meta.musicbrainz, expected);
 
         // Clearing URLs.
         artist.clear_musicbrainz_ref();
         _ = expected.take();
-        assert_eq!(artist.musicbrainz, expected);
+        assert_eq!(artist.meta.musicbrainz, expected);
     }
 
     #[test]
@@ -242,70 +250,70 @@ mod tests {
         let mut artist = Artist::new(ArtistId::new("an artist"));
 
         let mut expected: Vec<String> = vec![];
-        assert!(artist.properties.is_empty());
+        assert!(artist.meta.properties.is_empty());
 
         // Adding a single URL.
         artist.add_to_property("MusicButler", vec![MUSICBUTLER]);
         expected.push(MUSICBUTLER.to_owned());
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         // Adding a URL that already exists is ok, but does not do anything.
         artist.add_to_property("MusicButler", vec![MUSICBUTLER]);
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         // Adding another single URL.
         artist.add_to_property("MusicButler", vec![MUSICBUTLER_2]);
         expected.push(MUSICBUTLER_2.to_owned());
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         artist.add_to_property("MusicButler", vec![MUSICBUTLER_2]);
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         // Removing a URL.
         artist.remove_from_property("MusicButler", vec![MUSICBUTLER]);
         expected.retain(|url| url != MUSICBUTLER);
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         // Removing URls that do not exist is okay, they will be ignored.
         artist.remove_from_property("MusicButler", vec![MUSICBUTLER]);
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         // Removing a URL.
         artist.remove_from_property("MusicButler", vec![MUSICBUTLER_2]);
         expected.retain(|url| url.as_str() != MUSICBUTLER_2);
-        assert!(artist.properties.is_empty());
+        assert!(artist.meta.properties.is_empty());
 
         artist.remove_from_property("MusicButler", vec![MUSICBUTLER_2]);
-        assert!(artist.properties.is_empty());
+        assert!(artist.meta.properties.is_empty());
 
         // Adding URLs if some exist is okay, they will be ignored.
         artist.add_to_property("MusicButler", vec![MUSICBUTLER]);
         expected.push(MUSICBUTLER.to_owned());
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         artist.add_to_property("MusicButler", vec![MUSICBUTLER, MUSICBUTLER_2]);
         expected.push(MUSICBUTLER_2.to_owned());
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         // Removing URLs if some do not exist is okay, they will be ignored.
         artist.remove_from_property("MusicButler", vec![MUSICBUTLER]);
         expected.retain(|url| url.as_str() != MUSICBUTLER);
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         artist.remove_from_property("MusicButler", vec![MUSICBUTLER, MUSICBUTLER_2]);
         expected.retain(|url| url.as_str() != MUSICBUTLER_2);
-        assert!(artist.properties.is_empty());
+        assert!(artist.meta.properties.is_empty());
 
         // Adding mutliple URLs without clashes.
         artist.add_to_property("MusicButler", vec![MUSICBUTLER, MUSICBUTLER_2]);
         expected.push(MUSICBUTLER.to_owned());
         expected.push(MUSICBUTLER_2.to_owned());
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         // Removing multiple URLs without clashes.
         artist.remove_from_property("MusicButler", vec![MUSICBUTLER, MUSICBUTLER_2]);
         expected.clear();
-        assert!(artist.properties.is_empty());
+        assert!(artist.meta.properties.is_empty());
     }
 
     #[test]
@@ -313,40 +321,43 @@ mod tests {
         let mut artist = Artist::new(ArtistId::new("an artist"));
 
         let mut expected: Vec<String> = vec![];
-        assert!(artist.properties.is_empty());
+        assert!(artist.meta.properties.is_empty());
 
         // Set URLs.
         artist.set_property("MusicButler", vec![MUSICBUTLER]);
         expected.push(MUSICBUTLER.to_owned());
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         artist.set_property("MusicButler", vec![MUSICBUTLER_2]);
         expected.clear();
         expected.push(MUSICBUTLER_2.to_owned());
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         artist.set_property("MusicButler", vec![MUSICBUTLER, MUSICBUTLER_2]);
         expected.clear();
         expected.push(MUSICBUTLER.to_owned());
         expected.push(MUSICBUTLER_2.to_owned());
-        assert_eq!(artist.properties.get("MusicButler"), Some(&expected));
+        assert_eq!(artist.meta.properties.get("MusicButler"), Some(&expected));
 
         // Clear URLs.
         artist.clear_property("MusicButler");
         expected.clear();
-        assert!(artist.properties.is_empty());
+        assert!(artist.meta.properties.is_empty());
     }
 
     #[test]
     fn merge_artist_no_overlap() {
         let left = FULL_COLLECTION[0].to_owned();
         let mut right = FULL_COLLECTION[1].to_owned();
-        right.id = left.id.clone();
-        right.musicbrainz = None;
-        right.properties = HashMap::new();
+        right.meta.id = left.meta.id.clone();
+        right.meta.musicbrainz = None;
+        right.meta.properties = HashMap::new();
 
         let mut expected = left.clone();
-        expected.properties = expected.properties.merge(right.clone().properties);
+        expected.meta.properties = expected
+            .meta
+            .properties
+            .merge(right.clone().meta.properties);
         expected.albums.append(&mut right.albums.clone());
         expected.albums.sort_unstable();
 
@@ -362,12 +373,15 @@ mod tests {
     fn merge_artist_overlap() {
         let mut left = FULL_COLLECTION[0].to_owned();
         let mut right = FULL_COLLECTION[1].to_owned();
-        right.id = left.id.clone();
+        right.meta.id = left.meta.id.clone();
         left.albums.push(right.albums[0].clone());
         left.albums.sort_unstable();
 
         let mut expected = left.clone();
-        expected.properties = expected.properties.merge(right.clone().properties);
+        expected.meta.properties = expected
+            .meta
+            .properties
+            .merge(right.clone().meta.properties);
         expected.albums.append(&mut right.albums.clone());
         expected.albums.sort_unstable();
         expected.albums.dedup();

src/core/musichoard/base.rs

@@ -59,14 +59,14 @@ impl<Database, Library> IMusicHoardBasePrivate for MusicHoard<Database, Library>
     }
 
     fn get_artist<'a>(collection: &'a Collection, artist_id: &ArtistId) -> Option<&'a Artist> {
-        collection.iter().find(|a| &a.id == artist_id)
+        collection.iter().find(|a| &a.meta.id == artist_id)
     }
 
     fn get_artist_mut<'a>(
         collection: &'a mut Collection,
         artist_id: &ArtistId,
     ) -> Option<&'a mut Artist> {
-        collection.iter_mut().find(|a| &a.id == artist_id)
+        collection.iter_mut().find(|a| &a.meta.id == artist_id)
     }
 
     fn get_artist_mut_or_err<'a>(
@@ -79,7 +79,7 @@ impl<Database, Library> IMusicHoardBasePrivate for MusicHoard<Database, Library>
     }
 
     fn get_album_mut<'a>(artist: &'a mut Artist, album_id: &AlbumId) -> Option<&'a mut Album> {
-        artist.albums.iter_mut().find(|a| &a.id == album_id)
+        artist.albums.iter_mut().find(|a| &a.meta.id == album_id)
     }
 
     fn get_album_mut_or_err<'a>(
@@ -115,7 +115,7 @@ mod tests {
             library_cache: left
                 .clone()
                 .into_iter()
-                .map(|a| (a.id.clone(), a))
+                .map(|a| (a.meta.id.clone(), a))
                 .collect(),
             database_cache: right.clone(),
             ..Default::default()
@@ -129,7 +129,7 @@ mod tests {
             library_cache: right
                 .clone()
                 .into_iter()
-                .map(|a| (a.id.clone(), a))
+                .map(|a| (a.meta.id.clone(), a))
                 .collect(),
             database_cache: left.clone(),
             ..Default::default()
@@ -153,7 +153,7 @@ mod tests {
             library_cache: left
                 .clone()
                 .into_iter()
-                .map(|a| (a.id.clone(), a))
+                .map(|a| (a.meta.id.clone(), a))
                 .collect(),
             database_cache: right.clone(),
             ..Default::default()
@@ -167,7 +167,7 @@ mod tests {
             library_cache: right
                 .clone()
                 .into_iter()
-                .map(|a| (a.id.clone(), a))
+                .map(|a| (a.meta.id.clone(), a))
                 .collect(),
             database_cache: left.clone(),
             ..Default::default()
@@ -191,20 +191,20 @@ mod tests {
 
         assert!(right.first().unwrap() > left.first().unwrap());
         let artist_sort = Some(ArtistId::new("Album_Artist 0"));
-        right[0].sort = artist_sort.clone();
+        right[0].meta.sort = artist_sort.clone();
         assert!(right.first().unwrap() < left.first().unwrap());
 
         // The result of the merge should be the same list of artists, but with the last artist now
         // in first place.
         let mut expected = left.to_owned();
-        expected.last_mut().as_mut().unwrap().sort = artist_sort.clone();
+        expected.last_mut().as_mut().unwrap().meta.sort = artist_sort.clone();
         expected.rotate_right(1);
 
         let mut mh = MusicHoard {
             library_cache: left
                 .clone()
                 .into_iter()
-                .map(|a| (a.id.clone(), a))
+                .map(|a| (a.meta.id.clone(), a))
                 .collect(),
             database_cache: right.clone(),
             ..Default::default()
@@ -218,7 +218,7 @@ mod tests {
             library_cache: right
                 .clone()
                 .into_iter()
-                .map(|a| (a.id.clone(), a))
+                .map(|a| (a.meta.id.clone(), a))
                 .collect(),
             database_cache: left.clone(),
             ..Default::default()

src/core/musichoard/database.rs

@@ -91,7 +91,9 @@ impl<Database: IDatabase, Library> IMusicHoardDatabase for MusicHoard<Database,
 
     fn remove_artist<Id: AsRef<ArtistId>>(&mut self, artist_id: Id) -> Result<(), Error> {
         self.update_collection(|collection| {
-            let index_opt = collection.iter().position(|a| &a.id == artist_id.as_ref());
+            let index_opt = collection
+                .iter()
+                .position(|a| &a.meta.id == artist_id.as_ref());
             if let Some(index) = index_opt {
                 collection.remove(index);
             }
@@ -434,29 +436,29 @@ mod tests {
         assert!(music_hoard.add_artist(artist_id.clone()).is_ok());
 
         let mut expected: Option<MbArtistRef> = None;
-        assert_eq!(music_hoard.collection[0].musicbrainz, expected);
+        assert_eq!(music_hoard.collection[0].meta.musicbrainz, expected);
 
         // Setting a URL on an artist not in the collection is an error.
         assert!(music_hoard
             .set_artist_musicbrainz(&artist_id_2, MUSICBRAINZ)
             .is_err());
-        assert_eq!(music_hoard.collection[0].musicbrainz, expected);
+        assert_eq!(music_hoard.collection[0].meta.musicbrainz, expected);
 
         // Setting a URL on an artist.
         assert!(music_hoard
             .set_artist_musicbrainz(&artist_id, MUSICBRAINZ)
             .is_ok());
         _ = expected.insert(MbArtistRef::from_url_str(MUSICBRAINZ).unwrap());
-        assert_eq!(music_hoard.collection[0].musicbrainz, expected);
+        assert_eq!(music_hoard.collection[0].meta.musicbrainz, expected);
 
         // Clearing URLs on an artist that does not exist is an error.
         assert!(music_hoard.clear_artist_musicbrainz(&artist_id_2).is_err());
-        assert_eq!(music_hoard.collection[0].musicbrainz, expected);
+        assert_eq!(music_hoard.collection[0].meta.musicbrainz, expected);
 
         // Clearing URLs.
         assert!(music_hoard.clear_artist_musicbrainz(&artist_id).is_ok());
         _ = expected.take();
-        assert_eq!(music_hoard.collection[0].musicbrainz, expected);
+        assert_eq!(music_hoard.collection[0].meta.musicbrainz, expected);
     }
 
     #[test]
@@ -472,13 +474,13 @@ mod tests {
         assert!(music_hoard.add_artist(artist_id.clone()).is_ok());
 
         let mut expected: Vec<String> = vec![];
-        assert!(music_hoard.collection[0].properties.is_empty());
+        assert!(music_hoard.collection[0].meta.properties.is_empty());
 
         // Adding URLs to an artist not in the collection is an error.
         assert!(music_hoard
             .add_to_artist_property(&artist_id_2, "MusicButler", vec![MUSICBUTLER])
             .is_err());
-        assert!(music_hoard.collection[0].properties.is_empty());
+        assert!(music_hoard.collection[0].meta.properties.is_empty());
 
         // Adding mutliple URLs without clashes.
         assert!(music_hoard
@@ -487,7 +489,7 @@ mod tests {
         expected.push(MUSICBUTLER.to_owned());
         expected.push(MUSICBUTLER_2.to_owned());
         assert_eq!(
-            music_hoard.collection[0].properties.get("MusicButler"),
+            music_hoard.collection[0].meta.properties.get("MusicButler"),
             Some(&expected)
         );
 
@@ -496,7 +498,7 @@ mod tests {
             .remove_from_artist_property(&artist_id_2, "MusicButler", vec![MUSICBUTLER])
             .is_err());
         assert_eq!(
-            music_hoard.collection[0].properties.get("MusicButler"),
+            music_hoard.collection[0].meta.properties.get("MusicButler"),
             Some(&expected)
         );
 
@@ -509,7 +511,7 @@ mod tests {
             )
             .is_ok());
         expected.clear();
-        assert!(music_hoard.collection[0].properties.is_empty());
+        assert!(music_hoard.collection[0].meta.properties.is_empty());
     }
 
     #[test]
@@ -525,13 +527,13 @@ mod tests {
         assert!(music_hoard.add_artist(artist_id.clone()).is_ok());
 
         let mut expected: Vec<String> = vec![];
-        assert!(music_hoard.collection[0].properties.is_empty());
+        assert!(music_hoard.collection[0].meta.properties.is_empty());
 
         // Seting URL on an artist not in the collection is an error.
         assert!(music_hoard
             .set_artist_property(&artist_id_2, "MusicButler", vec![MUSICBUTLER])
             .is_err());
-        assert!(music_hoard.collection[0].properties.is_empty());
+        assert!(music_hoard.collection[0].meta.properties.is_empty());
 
         // Set URLs.
         assert!(music_hoard
@@ -541,7 +543,7 @@ mod tests {
         expected.push(MUSICBUTLER.to_owned());
         expected.push(MUSICBUTLER_2.to_owned());
         assert_eq!(
-            music_hoard.collection[0].properties.get("MusicButler"),
+            music_hoard.collection[0].meta.properties.get("MusicButler"),
             Some(&expected)
         );
 
@@ -555,7 +557,7 @@ mod tests {
             .clear_artist_property(&artist_id, "MusicButler")
             .is_ok());
         expected.clear();
-        assert!(music_hoard.collection[0].properties.is_empty());
+        assert!(music_hoard.collection[0].meta.properties.is_empty());
     }
 
     #[test]
@@ -581,17 +583,17 @@ mod tests {
         database.expect_save().times(2).returning(|_| Ok(()));
 
         let mut music_hoard = MusicHoard::database(database).unwrap();
-        assert_eq!(music_hoard.collection[0].albums[0].seq, AlbumSeq(0));
+        assert_eq!(music_hoard.collection[0].albums[0].meta.seq, AlbumSeq(0));
 
         // Seting seq on an album not belonging to the artist is an error.
         assert!(music_hoard
             .set_album_seq(&artist_id, &album_id_2, 6)
             .is_err());
-        assert_eq!(music_hoard.collection[0].albums[0].seq, AlbumSeq(0));
+        assert_eq!(music_hoard.collection[0].albums[0].meta.seq, AlbumSeq(0));
 
         // Set seq.
         assert!(music_hoard.set_album_seq(&artist_id, &album_id, 6).is_ok());
-        assert_eq!(music_hoard.collection[0].albums[0].seq, AlbumSeq(6));
+        assert_eq!(music_hoard.collection[0].albums[0].meta.seq, AlbumSeq(6));
 
         // Clearing seq on an album that does not exist is an error.
         assert!(music_hoard
@@ -600,7 +602,7 @@ mod tests {
 
         // Clear seq.
         assert!(music_hoard.clear_album_seq(&artist_id, &album_id).is_ok());
-        assert_eq!(music_hoard.collection[0].albums[0].seq, AlbumSeq(0));
+        assert_eq!(music_hoard.collection[0].albums[0].meta.seq, AlbumSeq(0));
     }
 
     #[test]

src/core/musichoard/library.rs

@@ -86,17 +86,17 @@ impl<Database, Library: ILibrary> MusicHoard<Database, Library> {
                     .or_insert_with(|| Artist::new(artist_id)),
             };
 
-            if artist.sort.is_some() {
-                if artist_sort.is_some() && (artist.sort != artist_sort) {
+            if artist.meta.sort.is_some() {
+                if artist_sort.is_some() && (artist.meta.sort != artist_sort) {
                     return Err(Error::CollectionError(format!(
                         "multiple album_artist_sort found for artist '{}': '{}' != '{}'",
-                        artist.id,
-                        artist.sort.as_ref().unwrap(),
+                        artist.meta.id,
+                        artist.meta.sort.as_ref().unwrap(),
                         artist_sort.as_ref().unwrap()
                     )));
                 }
             } else if artist_sort.is_some() {
-                artist.sort = artist_sort;
+                artist.meta.sort = artist_sort;
             }
 
             // Do a linear search as few artists have more than a handful of albums. Search from the
@@ -105,7 +105,7 @@ impl<Database, Library: ILibrary> MusicHoard<Database, Library> {
                 .albums
                 .iter_mut()
                 .rev()
-                .find(|album| album.id == album_id)
+                .find(|album| album.meta.id == album_id)
             {
                 Some(album) => album.tracks.push(track),
                 None => {
@@ -197,13 +197,13 @@ mod tests {
         assert!(music_hoard.get_collection()[0]
             .albums
             .iter()
-            .any(|album| album.id.title == "album_title a.a"));
+            .any(|album| album.meta.id.title == "album_title a.a"));
 
         music_hoard.rescan_library().unwrap();
         assert!(!music_hoard.get_collection()[0]
             .albums
             .iter()
-            .any(|album| album.id.title == "album_title a.a"));
+            .any(|album| album.meta.id.title == "album_title a.a"));
     }
 
     #[test]
@@ -234,8 +234,8 @@ mod tests {
         let mut library = MockILibrary::new();
 
         let mut expected = LIBRARY_COLLECTION.to_owned();
-        let removed_album_id = expected[0].albums[0].id.clone();
-        let clashed_album_id = &expected[1].albums[0].id;
+        let removed_album_id = expected[0].albums[0].meta.id.clone();
+        let clashed_album_id = &expected[1].albums[0].meta.id;
 
         let mut items = LIBRARY_ITEMS.to_owned();
         for item in items
@@ -245,7 +245,7 @@ mod tests {
             item.album_title = clashed_album_id.title.clone();
         }
 
-        expected[0].albums[0].id = clashed_album_id.clone();
+        expected[0].albums[0].meta.id = clashed_album_id.clone();
 
         let library_input = Query::new();
         let library_result = Ok(items);

src/core/testmod.rs

@@ -2,8 +2,8 @@ use once_cell::sync::Lazy;
 use std::collections::HashMap;
 
 use crate::core::collection::{
-    album::{Album, AlbumId, AlbumPrimaryType, AlbumSeq},
-    artist::{Artist, ArtistId},
+    album::{Album, AlbumId, AlbumMeta, AlbumPrimaryType, AlbumSeq},
+    artist::{Artist, ArtistId, ArtistMeta},
     musicbrainz::{MbAlbumRef, MbArtistRef},
     track::{Track, TrackFormat, TrackId, TrackNum, TrackQuality},
 };

src/external/database/json/mod.rs

@@ -83,7 +83,7 @@ mod tests {
         let mut expected = FULL_COLLECTION.to_owned();
         for artist in expected.iter_mut() {
             for album in artist.albums.iter_mut() {
-                album.date = AlbumDate::default();
+                album.meta.date = AlbumDate::default();
                 album.tracks.clear();
             }
         }

src/external/database/serde/deserialize.rs

@@ -3,7 +3,7 @@ use std::{collections::HashMap, fmt};
 use serde::{de::Visitor, Deserialize, Deserializer};
 
 use crate::{
-    collection::musicbrainz::Mbid,
+    collection::{album::AlbumMeta, artist::ArtistMeta, musicbrainz::Mbid},
     core::collection::{
         album::{Album, AlbumDate, AlbumId, AlbumSeq},
         artist::{Artist, ArtistId},
@@ -86,10 +86,12 @@ impl<'de> Deserialize<'de> for DeserializeMbid {
 impl From<DeserializeArtist> for Artist {
     fn from(artist: DeserializeArtist) -> Self {
         Artist {
+            meta: ArtistMeta {
                 id: ArtistId::new(artist.name),
                 sort: artist.sort.map(ArtistId::new),
                 musicbrainz: artist.musicbrainz.map(Into::<Mbid>::into).map(Into::into),
                 properties: artist.properties,
+            },
             albums: artist.albums.into_iter().map(Into::into).collect(),
         }
     }
@@ -98,12 +100,14 @@ impl From<DeserializeArtist> for Artist {
 impl From<DeserializeAlbum> for Album {
     fn from(album: DeserializeAlbum) -> Self {
         Album {
+            meta: AlbumMeta {
                 id: AlbumId { title: album.title },
                 date: AlbumDate::default(),
                 seq: AlbumSeq(album.seq),
                 musicbrainz: album.musicbrainz.map(Into::<Mbid>::into).map(Into::into),
                 primary_type: album.primary_type.map(Into::into),
                 secondary_types: album.secondary_types.into_iter().map(Into::into).collect(),
+            },
             tracks: vec![],
         }
     }

src/external/database/serde/serialize.rs

@@ -52,13 +52,15 @@ impl<'a> Serialize for SerializeMbid<'a> {
 impl<'a> From<&'a Artist> for SerializeArtist<'a> {
     fn from(artist: &'a Artist) -> Self {
         SerializeArtist {
-            name: &artist.id.name,
-            sort: artist.sort.as_ref().map(|id| id.name.as_ref()),
+            name: &artist.meta.id.name,
+            sort: artist.meta.sort.as_ref().map(|id| id.name.as_ref()),
             musicbrainz: artist
+                .meta
                 .musicbrainz
                 .as_ref()
                 .map(|mbref| SerializeMbid(mbref.mbid())),
             properties: artist
+                .meta
                 .properties
                 .iter()
                 .map(|(k, v)| (k.as_ref(), v))
@@ -71,14 +73,16 @@ impl<'a> From<&'a Artist> for SerializeArtist<'a> {
 impl<'a> From<&'a Album> for SerializeAlbum<'a> {
     fn from(album: &'a Album) -> Self {
         SerializeAlbum {
-            title: &album.id.title,
-            seq: album.seq.0,
+            title: &album.meta.id.title,
+            seq: album.meta.seq.0,
             musicbrainz: album
+                .meta
                 .musicbrainz
                 .as_ref()
                 .map(|mbref| SerializeMbid(mbref.mbid())),
-            primary_type: album.primary_type.map(Into::into),
+            primary_type: album.meta.primary_type.map(Into::into),
             secondary_types: album
+                .meta
                 .secondary_types
                 .iter()
                 .copied()

src/testmod/full.rs

@@ -2,6 +2,7 @@ macro_rules! full_collection {
     () => {
         vec![
             Artist {
+                meta: ArtistMeta {
                     id: ArtistId {
                         name: "Album_Artist ‘A’".to_string(),
                     },
@@ -19,8 +20,10 @@ macro_rules! full_collection {
                             )
                         ]),
                     ]),
+                },
                 albums: vec![
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title a.a".to_string(),
                             },
@@ -31,6 +34,7 @@ macro_rules! full_collection {
                             ).unwrap()),
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -82,6 +86,7 @@ macro_rules! full_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title a.b".to_string(),
                             },
@@ -90,6 +95,7 @@ macro_rules! full_collection {
                             musicbrainz: None,
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -118,6 +124,7 @@ macro_rules! full_collection {
                 ],
             },
             Artist {
+                meta: ArtistMeta {
                     id: ArtistId {
                         name: "Album_Artist ‘B’".to_string(),
                     },
@@ -139,8 +146,10 @@ macro_rules! full_collection {
                             )
                         ]),
                     ]),
+                },
                 albums: vec![
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title b.a".to_string(),
                             },
@@ -149,6 +158,7 @@ macro_rules! full_collection {
                             musicbrainz: None,
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -178,6 +188,7 @@ macro_rules! full_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title b.b".to_string(),
                             },
@@ -188,6 +199,7 @@ macro_rules! full_collection {
                             ).unwrap()),
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -217,6 +229,7 @@ macro_rules! full_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title b.c".to_string(),
                             },
@@ -227,6 +240,7 @@ macro_rules! full_collection {
                             ).unwrap()),
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -256,6 +270,7 @@ macro_rules! full_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title b.d".to_string(),
                             },
@@ -264,6 +279,7 @@ macro_rules! full_collection {
                             musicbrainz: None,
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -295,6 +311,7 @@ macro_rules! full_collection {
                 ],
             },
             Artist {
+                meta: ArtistMeta {
                     id: ArtistId {
                         name: "The Album_Artist ‘C’".to_string(),
                     },
@@ -305,8 +322,10 @@ macro_rules! full_collection {
                         "https://musicbrainz.org/artist/11111111-1111-1111-1111-111111111111"
                     ).unwrap()),
                     properties: HashMap::new(),
+                },
                 albums: vec![
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title c.a".to_string(),
                             },
@@ -315,6 +334,7 @@ macro_rules! full_collection {
                             musicbrainz: None,
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -344,6 +364,7 @@ macro_rules! full_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title c.b".to_string(),
                             },
@@ -352,6 +373,7 @@ macro_rules! full_collection {
                             musicbrainz: None,
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -383,14 +405,17 @@ macro_rules! full_collection {
                 ],
             },
             Artist {
+                meta: ArtistMeta {
                     id: ArtistId {
                         name: "Album_Artist ‘D’".to_string(),
                     },
                     sort: None,
                     musicbrainz: None,
                     properties: HashMap::new(),
+                },
                 albums: vec![
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title d.a".to_string(),
                             },
@@ -399,6 +424,7 @@ macro_rules! full_collection {
                             musicbrainz: None,
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -428,6 +454,7 @@ macro_rules! full_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title d.b".to_string(),
                             },
@@ -436,6 +463,7 @@ macro_rules! full_collection {
                             musicbrainz: None,
                             primary_type: Some(AlbumPrimaryType::Album),
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {

src/testmod/library.rs

@@ -3,14 +3,17 @@ macro_rules! library_collection {
     () => {
         vec![
             Artist {
+                meta: ArtistMeta {
                     id: ArtistId {
                         name: "Album_Artist ‘A’".to_string(),
                     },
                     sort: None,
                     musicbrainz: None,
                     properties: HashMap::new(),
+                },
                 albums: vec![
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title a.a".to_string(),
                             },
@@ -19,6 +22,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -70,6 +74,7 @@ macro_rules! library_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title a.b".to_string(),
                             },
@@ -78,6 +83,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -106,14 +112,17 @@ macro_rules! library_collection {
                 ],
             },
             Artist {
+                meta: ArtistMeta {
                     id: ArtistId {
                         name: "Album_Artist ‘B’".to_string(),
                     },
                     sort: None,
                     musicbrainz: None,
                     properties: HashMap::new(),
+                },
                 albums: vec![
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title b.a".to_string(),
                             },
@@ -122,6 +131,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -151,6 +161,7 @@ macro_rules! library_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title b.b".to_string(),
                             },
@@ -159,6 +170,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -188,6 +200,7 @@ macro_rules! library_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title b.c".to_string(),
                             },
@@ -196,6 +209,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -225,6 +239,7 @@ macro_rules! library_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title b.d".to_string(),
                             },
@@ -233,6 +248,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -264,6 +280,7 @@ macro_rules! library_collection {
                 ],
             },
             Artist {
+                meta: ArtistMeta {
                     id: ArtistId {
                         name: "The Album_Artist ‘C’".to_string(),
                     },
@@ -272,8 +289,10 @@ macro_rules! library_collection {
                     }),
                     musicbrainz: None,
                     properties: HashMap::new(),
+                },
                 albums: vec![
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title c.a".to_string(),
                             },
@@ -282,6 +301,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -311,6 +331,7 @@ macro_rules! library_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title c.b".to_string(),
                             },
@@ -319,6 +340,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -350,14 +372,17 @@ macro_rules! library_collection {
                 ],
             },
             Artist {
+                meta: ArtistMeta {
                     id: ArtistId {
                         name: "Album_Artist ‘D’".to_string(),
                     },
                     sort: None,
                     musicbrainz: None,
                     properties: HashMap::new(),
+                },
                 albums: vec![
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title d.a".to_string(),
                             },
@@ -366,6 +391,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {
@@ -395,6 +421,7 @@ macro_rules! library_collection {
                         ],
                     },
                     Album {
+                        meta: AlbumMeta {
                             id: AlbumId {
                                 title: "album_title d.b".to_string(),
                             },
@@ -403,6 +430,7 @@ macro_rules! library_collection {
                             musicbrainz: None,
                             primary_type: None,
                             secondary_types: vec![],
+                        },
                         tracks: vec![
                             Track {
                                 id: TrackId {

src/tui/app/machine/browse.rs

@@ -93,13 +93,13 @@ impl IAppInteractBrowse for AppMachine<AppBrowse> {
 
         let (matches_tx, matches_rx) = mpsc::channel::<AppMatchesInfo>();
 
-        match artist.musicbrainz {
+        match artist.meta.musicbrainz {
             Some(ref mbid) => {
                 let arid = mbid.mbid();
 
                 let mut album_iter = artist.albums.iter().peekable();
                 while let Some(album) = album_iter.next() {
-                    if album.musicbrainz.is_some() {
+                    if album.meta.musicbrainz.is_some() {
                         continue;
                     }
 

src/tui/app/machine/matches.rs

@@ -194,8 +194,8 @@ mod tests {
         let album_match_1_1 = Match::new(100, album_1_1);
 
         let mut album_1_2 = album_1.clone();
-        album_1_2.id.title.push_str(" extra title part");
-        album_1_2.secondary_types.pop();
+        album_1_2.meta.id.title.push_str(" extra title part");
+        album_1_2.meta.secondary_types.pop();
         let album_match_1_2 = Match::new(100, album_1_2);
 
         let list = vec![album_match_1_1.clone(), album_match_1_2.clone()];

src/tui/app/machine/search.rs

@@ -181,10 +181,10 @@ impl IAppInteractSearchPrivate for AppMachine<AppSearch> {
     }
 
     fn predicate_artists(case_sens: bool, char_sens: bool, search: &str, probe: &Artist) -> bool {
-        let name = Self::normalize_search(&probe.id.name, !case_sens, !char_sens);
+        let name = Self::normalize_search(&probe.meta.id.name, !case_sens, !char_sens);
         let mut result = name.starts_with(search);
 
-        if let Some(ref probe_sort) = probe.sort {
+        if let Some(ref probe_sort) = probe.meta.sort {
             if !result {
                 let name = Self::normalize_search(&probe_sort.name, !case_sens, !char_sens);
                 result = name.starts_with(search);
@@ -195,7 +195,7 @@ impl IAppInteractSearchPrivate for AppMachine<AppSearch> {
     }
 
     fn predicate_albums(case_sens: bool, char_sens: bool, search: &str, probe: &Album) -> bool {
-        Self::predicate_title(case_sens, char_sens, search, &probe.id.title)
+        Self::predicate_title(case_sens, char_sens, search, &probe.meta.id.title)
     }
 
     fn predicate_tracks(case_sens: bool, char_sens: bool, search: &str, probe: &Track) -> bool {

src/tui/lib/external/musicbrainz/mod.rs

@@ -33,7 +33,7 @@ impl<Http> MusicBrainz<Http> {
 
 impl<Http: IMusicBrainzHttp> IMusicBrainz for MusicBrainz<Http> {
     fn search_artist(&mut self, artist: &Artist) -> Result<Vec<Match<Artist>>, Error> {
-        let query = SearchArtistRequest::new().string(&artist.id.name);
+        let query = SearchArtistRequest::new().string(&artist.meta.id.name);
 
         let mb_response = self.client.search_artist(query)?;
 
@@ -51,14 +51,14 @@ impl<Http: IMusicBrainzHttp> IMusicBrainz for MusicBrainz<Http> {
     ) -> Result<Vec<Match<Album>>, Error> {
         // Some release groups may have a promotional early release messing up the search. Searching
         // with just the year should be enough anyway.
-        let date = AlbumDate::new(album.date.year, None, None);
+        let date = AlbumDate::new(album.meta.date.year, None, None);
 
         let query = SearchReleaseGroupRequest::new()
             .arid(arid)
             .and()
             .first_release_date(&date)
             .and()
-            .release_group(&album.id.title);
+            .release_group(&album.meta.id.title);
 
         let mb_response = self.client.search_release_group(query)?;
 

src/tui/testmod.rs

@@ -1,8 +1,8 @@
 use std::collections::HashMap;
 
 use musichoard::collection::{
-    album::{Album, AlbumId, AlbumPrimaryType, AlbumSeq},
-    artist::{Artist, ArtistId},
+    album::{Album, AlbumId, AlbumMeta, AlbumPrimaryType, AlbumSeq},
+    artist::{Artist, ArtistId, ArtistMeta},
     musicbrainz::{MbAlbumRef, MbArtistRef},
     track::{Track, TrackFormat, TrackId, TrackNum, TrackQuality},
 };

src/tui/ui/browse.rs

@@ -120,7 +120,7 @@ impl<'a, 'b> ArtistState<'a, 'b> {
         let list = List::new(
             artists
                 .iter()
-                .map(|a| ListItem::new(a.id.name.as_str()))
+                .map(|a| ListItem::new(a.meta.id.name.as_str()))
                 .collect::<Vec<ListItem>>(),
         );
 
@@ -158,12 +158,12 @@ impl<'a, 'b> AlbumState<'a, 'b> {
              Date: {}\n\
              Type: {}\n\
              Status: {}",
-            album.map(|a| a.id.title.as_str()).unwrap_or(""),
+            album.map(|a| a.meta.id.title.as_str()).unwrap_or(""),
             album
-                .map(|a| UiDisplay::display_date(&a.date, &a.seq))
+                .map(|a| UiDisplay::display_date(&a.meta.date, &a.meta.seq))
                 .unwrap_or_default(),
             album
-                .map(|a| UiDisplay::display_type(&a.primary_type, &a.secondary_types))
+                .map(|a| UiDisplay::display_type(&a.meta.primary_type, &a.meta.secondary_types))
                 .unwrap_or_default(),
             album
                 .map(|a| UiDisplay::display_album_status(&a.get_status()))
@@ -180,10 +180,10 @@ impl<'a, 'b> AlbumState<'a, 'b> {
 
     fn to_list_item(album: &Album) -> ListItem {
         let line = match album.get_status() {
-            AlbumStatus::None => Line::raw(album.id.title.as_str()),
+            AlbumStatus::None => Line::raw(album.meta.id.title.as_str()),
             AlbumStatus::Owned(format) => match format {
-                TrackFormat::Mp3 => Line::styled(album.id.title.as_str(), UiColor::FG_WARN),
-                TrackFormat::Flac => Line::styled(album.id.title.as_str(), UiColor::FG_GOOD),
+                TrackFormat::Mp3 => Line::styled(album.meta.id.title.as_str(), UiColor::FG_WARN),
+                TrackFormat::Flac => Line::styled(album.meta.id.title.as_str(), UiColor::FG_GOOD),
             },
         };
         ListItem::new(line)

src/tui/ui/display.rs

@@ -99,14 +99,14 @@ impl UiDisplay {
     }
 
     pub fn display_artist_matching(artist: &Artist) -> String {
-        format!("Matching artist: {}", &artist.id.name)
+        format!("Matching artist: {}", &artist.meta.id.name)
     }
 
     pub fn display_album_matching(album: &Album) -> String {
         format!(
             "Matching album: {} | {}",
-            UiDisplay::display_album_date(&album.date),
-            &album.id.title
+            UiDisplay::display_album_date(&album.meta.date),
+            &album.meta.id.title
         )
     }
 
@@ -128,7 +128,7 @@ impl UiDisplay {
         match match_option {
             MatchOption::Match(match_artist) => format!(
                 "{}{} ({}%)",
-                &match_artist.item.id.name,
+                &match_artist.item.meta.id.name,
                 &match_artist
                     .disambiguation
                     .as_ref()
@@ -144,11 +144,11 @@ impl UiDisplay {
         match match_option {
             MatchOption::Match(match_album) => format!(
                 "{:010} | {} [{}] ({}%)",
-                UiDisplay::display_album_date(&match_album.item.date),
-                &match_album.item.id.title,
+                UiDisplay::display_album_date(&match_album.item.meta.date),
+                &match_album.item.meta.id.title,
                 UiDisplay::display_type(
-                    &match_album.item.primary_type,
-                    &match_album.item.secondary_types
+                    &match_album.item.meta.primary_type,
+                    &match_album.item.meta.secondary_types
                 ),
                 match_album.score,
             ),

src/tui/ui/info.rs

@@ -72,12 +72,12 @@ impl<'a> ArtistOverlay<'a> {
             "Artist: {}\n\n{item_indent}\
              MusicBrainz: {}\n{item_indent}\
              Properties: {}",
-            artist.map(|a| a.id.name.as_str()).unwrap_or(""),
+            artist.map(|a| a.meta.id.name.as_str()).unwrap_or(""),
             artist
-                .and_then(|a| a.musicbrainz.as_ref().map(|mb| mb.url().as_str()))
+                .and_then(|a| a.meta.musicbrainz.as_ref().map(|mb| mb.url().as_str()))
                 .unwrap_or(""),
             Self::opt_hashmap_to_string(
-                artist.map(|a| &a.properties),
+                artist.map(|a| &a.meta.properties),
                 &double_item_indent,
                 &double_list_indent
             ),
@@ -100,9 +100,9 @@ impl<'a> AlbumOverlay<'a> {
         let properties = Paragraph::new(format!(
             "Album: {}\n\n{item_indent}\
              MusicBrainz: {}",
-            album.map(|a| a.id.title.as_str()).unwrap_or(""),
+            album.map(|a| a.meta.id.title.as_str()).unwrap_or(""),
             album
-                .and_then(|a| a.musicbrainz.as_ref().map(|mb| mb.url().as_str()))
+                .and_then(|a| a.meta.musicbrainz.as_ref().map(|mb| mb.url().as_str()))
                 .unwrap_or(""),
         ));
 

tests/database/json.rs

@@ -18,7 +18,7 @@ fn expected() -> Collection {
     let mut expected = COLLECTION.to_owned();
     for artist in expected.iter_mut() {
         for album in artist.albums.iter_mut() {
-            album.date = AlbumDate::default();
+            album.meta.date = AlbumDate::default();
             album.tracks.clear();
         }
     }

tests/testlib.rs

@@ -2,8 +2,8 @@ use once_cell::sync::Lazy;
 use std::collections::HashMap;
 
 use musichoard::collection::{
-    album::{Album, AlbumId, AlbumPrimaryType, AlbumSecondaryType, AlbumSeq},
-    artist::{Artist, ArtistId},
+    album::{Album, AlbumId, AlbumMeta, AlbumPrimaryType, AlbumSecondaryType, AlbumSeq},
+    artist::{Artist, ArtistId, ArtistMeta},
     musicbrainz::MbArtistRef,
     track::{Track, TrackFormat, TrackId, TrackNum, TrackQuality},
     Collection,
@@ -12,6 +12,7 @@ use musichoard::collection::{
 pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
     vec![
         Artist {
+            meta: ArtistMeta {
                 id: ArtistId {
                     name: String::from("Аркона"),
                 },
@@ -32,7 +33,9 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                         "https://www.qobuz.com/nl-nl/interpreter/arkona/download-streaming-albums",
                     )]),
                 ]),
+            },
             albums: vec![Album {
+                meta: AlbumMeta {
                     id: AlbumId {
                         title: String::from("Slovo"),
                     },
@@ -41,6 +44,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                     musicbrainz: None,
                     primary_type: Some(AlbumPrimaryType::Album),
                     secondary_types: vec![],
+                },
                 tracks: vec![
                     Track {
                         id: TrackId {
@@ -200,6 +204,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
             }],
         },
         Artist {
+            meta: ArtistMeta {
                 id: ArtistId {
                     name: String::from("Eluveitie"),
                 },
@@ -215,8 +220,10 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                         "https://www.qobuz.com/nl-nl/interpreter/eluveitie/download-streaming-albums",
                     )]),
                 ]),
+            },
             albums: vec![
                 Album {
+                    meta: AlbumMeta {
                         id: AlbumId {
                             title: String::from("Vên [re‐recorded]"),
                         },
@@ -225,6 +232,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                         musicbrainz: None,
                         primary_type: Some(AlbumPrimaryType::Ep),
                         secondary_types: vec![],
+                    },
                     tracks: vec![
                         Track {
                             id: TrackId {
@@ -295,6 +303,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                     ],
                 },
                 Album {
+                    meta: AlbumMeta {
                         id: AlbumId {
                             title: String::from("Slania"),
                         },
@@ -303,6 +312,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                         musicbrainz: None,
                         primary_type: Some(AlbumPrimaryType::Album),
                         secondary_types: vec![],
+                    },
                     tracks: vec![
                         Track {
                             id: TrackId {
@@ -441,6 +451,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
             ],
         },
         Artist {
+            meta: ArtistMeta {
                 id: ArtistId {
                     name: String::from("Frontside"),
                 },
@@ -456,7 +467,9 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                         "https://www.qobuz.com/nl-nl/interpreter/frontside/download-streaming-albums",
                     )]),
                 ]),
+            },
             albums: vec![Album {
+                meta: AlbumMeta {
                     id: AlbumId {
                         title: String::from("…nasze jest królestwo, potęga i chwała na wieki…"),
                     },
@@ -465,6 +478,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                     musicbrainz: None,
                     primary_type: Some(AlbumPrimaryType::Album),
                     secondary_types: vec![],
+                },
                 tracks: vec![
                     Track {
                         id: TrackId {
@@ -591,6 +605,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
             }],
         },
         Artist {
+            meta: ArtistMeta {
                 id: ArtistId {
                     name: String::from("Heaven’s Basement"),
                 },
@@ -608,7 +623,9 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                         "https://www.qobuz.com/nl-nl/interpreter/heaven-s-basement/download-streaming-albums",
                     )]),
                 ]),
+            },
             albums: vec![Album {
+                meta: AlbumMeta {
                     id: AlbumId {
                         title: String::from("Paper Plague"),
                     },
@@ -617,6 +634,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                     musicbrainz: None,
                     primary_type: None,
                     secondary_types: vec![],
+                },
                 tracks: vec![
                     Track {
                         id: TrackId {
@@ -631,6 +649,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                     },
                 ],
             }, Album {
+                meta: AlbumMeta {
                     id: AlbumId {
                         title: String::from("Unbreakable"),
                     },
@@ -639,6 +658,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                     musicbrainz: None,
                     primary_type: Some(AlbumPrimaryType::Album),
                     secondary_types: vec![],
+                },
                 tracks: vec![
                     Track {
                         id: TrackId {
@@ -721,6 +741,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
             }],
         },
         Artist {
+            meta: ArtistMeta {
                 id: ArtistId {
                     name: String::from("Metallica"),
                 },
@@ -736,8 +757,10 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                         "https://www.qobuz.com/nl-nl/interpreter/metallica/download-streaming-albums",
                     )]),
                 ]),
+            },
             albums: vec![
                 Album {
+                    meta: AlbumMeta {
                         id: AlbumId {
                             title: String::from("Ride the Lightning"),
                         },
@@ -746,6 +769,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                         musicbrainz: None,
                         primary_type: Some(AlbumPrimaryType::Album),
                         secondary_types: vec![],
+                    },
                     tracks: vec![
                         Track {
                             id: TrackId {
@@ -838,6 +862,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                     ],
                 },
                 Album {
+                    meta: AlbumMeta {
                         id: AlbumId {
                             title: String::from("S&M"),
                         },
@@ -846,6 +871,7 @@ pub static COLLECTION: Lazy<Vec<Artist>> = Lazy::new(|| -> Collection {
                         musicbrainz: None,
                         primary_type: Some(AlbumPrimaryType::Album),
                         secondary_types: vec![AlbumSecondaryType::Live],
+                    },
                     tracks: vec![
                         Track {
                             id: TrackId {