Distinguish initial scan to import last time write as added time, ref #601

src/libs/database/impl/MediaLibrary.cpp

@@ -78,6 +78,13 @@ namespace lms::db
         });
     }
 
+    bool MediaLibrary::isEmpty() const
+    {
+        assert(session());
+        auto query{ session()->query<bool>("SELECT EXISTS (SELECT 1 FROM track WHERE media_library_id = ? LIMIT 1) AS is_media_library_empty").bind(getId()) };
+        return !utils::fetchQuerySingleResult(query);
+    }
+
     void MediaLibrary::setPath(const std::filesystem::path& p)
     {
         assert(p.is_absolute());

src/libs/database/include/database/MediaLibrary.hpp

@@ -50,6 +50,7 @@ namespace lms::db
         // getters
         std::string_view getName() const { return _name; }
         const std::filesystem::path& getPath() const { return _path; }
+        bool isEmpty() const;
 
         // setters
         void setName(std::string_view name) { _name = name; }

src/libs/database/test/Track.cpp

@@ -151,19 +151,31 @@ namespace lms::db::tests
         ScopedMediaLibrary library{ session, "MyLibrary", "/root" };
         ScopedMediaLibrary otherLibrary{ session, "OtherLibrary", "/otherRoot" };
 
+        {
+            auto transaction{ session.createReadTransaction() };
+            EXPECT_TRUE(library->isEmpty());
+            EXPECT_TRUE(otherLibrary->isEmpty());
+        }
+
         {
             auto transaction{ session.createWriteTransaction() };
             track.get().modify()->setMediaLibrary(library.get());
         }
 
         {
-            auto transaction{ session.createWriteTransaction() };
+            auto transaction{ session.createReadTransaction() };
+            EXPECT_FALSE(library->isEmpty());
+            EXPECT_TRUE(otherLibrary->isEmpty());
+        }
+
+        {
+            auto transaction{ session.createReadTransaction() };
             const auto tracks{ Track::findIds(session, Track::FindParameters{}.setMediaLibrary(library->getId())) };
             ASSERT_EQ(tracks.results.size(), 1);
             EXPECT_EQ(tracks.results.front(), track.getId());
         }
         {
-            auto transaction{ session.createWriteTransaction() };
+            auto transaction{ session.createReadTransaction() };
             const auto tracks{ Track::findIds(session, Track::FindParameters{}.setMediaLibrary(otherLibrary->getId())) };
             EXPECT_EQ(tracks.results.size(), 0);
         }