Implement the video adapter to retrieve the root folder content.

backend/application/src/video/service.rs

@@ -18,12 +18,12 @@ impl VideoService {
         Self { video_port }
     }
 
-    pub fn list_root_folder(self) -> Result<Vec<LibraryItem>, VideoError> {
+    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()
             .map(LibraryRawItem::map_to_library_item)
             .collect();
-        self.video_port.save_all(items_with_id);
+        self.video_port.save_all(&items_with_id)?;
         Ok(items_with_id)
     }
 }