Don't crash when editing a song that doesn't exist any more, also don't even add deleted songs to the playlist. Fixes issue #253.

src/librarybackend.cpp

@@ -906,7 +906,7 @@ PlaylistItemList LibraryBackend::GetPlaylistItems(int playlist) {
     if (!item)
       continue;
 
-    item->InitFromQuery(q);
+    if (item->InitFromQuery(q))
       ret << item;
   }
 

src/libraryplaylistitem.cpp

@@ -39,9 +39,11 @@ void LibraryPlaylistItem::Reload() {
   song_.InitFromFile(song_.filename(), song_.directory_id());
 }
 
-void LibraryPlaylistItem::InitFromQuery(const QSqlQuery &query) {
+bool LibraryPlaylistItem::InitFromQuery(const QSqlQuery &query) {
   // Rows from the songs table come first
   song_.InitFromQuery(query);
+
+  return song_.is_valid();
 }
 
 QVariant LibraryPlaylistItem::DatabaseValue(DatabaseColumn column) const {

src/libraryplaylistitem.h

@@ -25,7 +25,7 @@ class LibraryPlaylistItem : public PlaylistItem {
   LibraryPlaylistItem(const QString& type);
   LibraryPlaylistItem(const Song& song);
 
-  void InitFromQuery(const QSqlQuery &query);
+  bool InitFromQuery(const QSqlQuery &query);
   void BindToQuery(QSqlQuery *query) const;
   void Reload();
 

src/playlistitem.h

@@ -47,7 +47,7 @@ class PlaylistItem {
 
   virtual Options options() const { return Default; }
 
-  virtual void InitFromQuery(const QSqlQuery& query) = 0;
+  virtual bool InitFromQuery(const QSqlQuery& query) = 0;
   void BindToQuery(QSqlQuery* query) const;
   virtual void Reload() {}
 

src/radioplaylistitem.cpp

@@ -40,7 +40,7 @@ RadioPlaylistItem::RadioPlaylistItem(RadioService* service, const QUrl& url,
   InitMetadata();
 }
 
-void RadioPlaylistItem::InitFromQuery(const QSqlQuery &query) {
+bool RadioPlaylistItem::InitFromQuery(const QSqlQuery &query) {
   // The song table gets joined first, plus one for the song ROWID
   const int row = Song::kColumns.count() + 1;
 
@@ -52,6 +52,7 @@ void RadioPlaylistItem::InitFromQuery(const QSqlQuery &query) {
   service_ = RadioModel::ServiceByName(service);
 
   InitMetadata();
+  return true;
 }
 
 QVariant RadioPlaylistItem::DatabaseValue(DatabaseColumn column) const {

src/radioplaylistitem.h

@@ -32,7 +32,7 @@ class RadioPlaylistItem : public PlaylistItem {
 
   Options options() const;
 
-  void InitFromQuery(const QSqlQuery &query);
+  bool InitFromQuery(const QSqlQuery &query);
   void BindToQuery(QSqlQuery *query) const;
 
   Song Metadata() const;

src/song.cpp

@@ -490,6 +490,9 @@ bool Song::Save() const {
 
   scoped_ptr<TagLib::FileRef> fileref(factory_->GetFileRef(d->filename_));
 
+  if (!fileref || fileref->isNull()) // The file probably doesn't exist
+    return false;
+
   fileref->tag()->setTitle(QStringToTaglibString(d->title_));
   fileref->tag()->setArtist(QStringToTaglibString(d->artist_));
   fileref->tag()->setAlbum(QStringToTaglibString(d->album_));

src/songplaylistitem.cpp

@@ -31,7 +31,7 @@ SongPlaylistItem::SongPlaylistItem(const Song& song)
 {
 }
 
-void SongPlaylistItem::InitFromQuery(const QSqlQuery &query) {
+bool SongPlaylistItem::InitFromQuery(const QSqlQuery &query) {
   // The song table gets joined first, plus one for the song ROWID
   const int row = Song::kColumns.count() + 1;
 
@@ -53,7 +53,11 @@ void SongPlaylistItem::InitFromQuery(const QSqlQuery &query) {
     song_.Init(title, artist, album, length);
   } else {
     song_.InitFromFile(filename, -1);
+
+    if (!song_.is_valid())
+      return false;
   }
+  return true;
 }
 
 QVariant SongPlaylistItem::DatabaseValue(DatabaseColumn column) const {

src/songplaylistitem.h

@@ -25,7 +25,7 @@ class SongPlaylistItem : public PlaylistItem {
   SongPlaylistItem(const QString& type);
   SongPlaylistItem(const Song& song);
 
-  void InitFromQuery(const QSqlQuery &query);
+  bool InitFromQuery(const QSqlQuery &query);
   void Reload();
 
   Song Metadata() const { return song_; }

tests/mock_playlistitem.h

@@ -30,7 +30,7 @@ class MockPlaylistItem : public PlaylistItem {
   MOCK_CONST_METHOD0(options,
       Options());
   MOCK_METHOD1(InitFromQuery,
-      void(const QSqlQuery& settings));
+      bool(const QSqlQuery& settings));
   MOCK_METHOD0(Reload,
       void());
   MOCK_CONST_METHOD0(Metadata,