Iterate on clusters to better trace

src/libs/database/impl/Cluster.cpp

@@ -113,6 +113,14 @@ namespace lms::db
         return utils::execRangeQuery<Cluster::pointer>(query, params.range);
     }
 
+    void Cluster::find(Session& session, const FindParameters& params, std::function<void(const pointer& cluster)> _func)
+    {
+        session.checkReadTransaction();
+        auto query{ createQuery<Wt::Dbo::ptr<Cluster>>(session, params) };
+
+        return utils::forEachQueryResult(query, _func);
+    }
+
     RangeResults<ClusterId> Cluster::findOrphanIds(Session& session, std::optional<Range> range)
     {
         session.checkReadTransaction();

src/libs/subsonic/impl/responses/Album.cpp

@@ -132,9 +132,11 @@ namespace lms::api::subsonic
             params.setRelease(release->getId());
             params.setClusterTypeName(clusterTypeName);
 
-            for (const auto& cluster : Cluster::find(context.dbSession, params).results)
-                albumNode.addArrayValue(field, cluster->getName());
-        } };
+            Cluster::find(context.dbSession, params, [&](const Cluster::pointer& cluster)
+                {
+                    albumNode.addArrayValue(field, cluster->getName());
+                });
+        }};
 
         addClusters("moods", "MOOD");
 
@@ -146,8 +148,10 @@ namespace lms::api::subsonic
             params.setRelease(release->getId());
             params.setClusterType(genreClusterType->getId());
 
-            for (const auto& cluster : Cluster::find(context.dbSession, params).results)
-                albumNode.addArrayChild("genres", createItemGenreNode(cluster->getName()));
+            Cluster::find(context.dbSession, params, [&](const Cluster::pointer& cluster)
+                {
+                    albumNode.addArrayChild("genres", createItemGenreNode(cluster->getName()));
+                });
         }
 
         albumNode.createEmptyArrayChild("artists");