refac

Author: tjbck

backend/open_webui/routers/retrieval.py

@@ -760,7 +760,11 @@ def _get_docs_info(docs: list[Document]) -> str:
     # for meta-data so convert them to string.
     for metadata in metadatas:
         for key, value in metadata.items():
-            if isinstance(value, datetime):
+            if (
+                isinstance(value, datetime)
+                or isinstance(value, list)
+                or isinstance(value, dict)
+            ):
                 metadata[key] = str(value)
 
     try: