Merge FS and DB library raw items.

backend/application/src/video/service.rs

@@ -20,11 +20,21 @@ impl VideoService {
 
     pub fn list_root_folder(&self) -> Result<Vec<LibraryItem>, VideoError> {
         let read_items_with_possibly_no_id = self.video_port.list_root_folder()?;
-        let items_with_id = read_items_with_possibly_no_id.iter()
+        
+        let new_items = read_items_with_possibly_no_id.iter()
+            .filter(|item| item.id.is_none())
             .map(LibraryRawItem::map_to_library_item)
             .collect();
-        self.video_port.save_all(&items_with_id)?;
-        Ok(items_with_id)
+        
+        let already_existing_items = read_items_with_possibly_no_id.iter()
+            .filter(|item| item.id.is_some())
+            .map(LibraryRawItem::map_to_library_item)
+            .collect::<Vec<LibraryItem>>();
+        
+        self.video_port.save_all(&new_items)?;
+        
+        let all_items = already_existing_items.into_iter().chain(new_items).collect();
+        Ok(all_items)
     }
 }