Fix file_path error in PostgreSQL storage

lightrag/kg/postgres_impl.py

@@ -1891,9 +1891,9 @@ SQL_TEMPLATES = {
             FROM LIGHTRAG_DOC_CHUNKS
             WHERE {doc_ids} IS NULL OR full_doc_id = ANY(ARRAY[{doc_ids}])
         )
-        SELECT id FROM
+        SELECT id, content, file_path FROM
             (
-                SELECT id, 1 - (content_vector <=> '[{embedding_string}]'::vector) as distance
+                SELECT id, content, file_path, 1 - (content_vector <=> '[{embedding_string}]'::vector) as distance
                 FROM LIGHTRAG_DOC_CHUNKS
                 where workspace=$1
                 AND id IN (SELECT chunk_id FROM relevant_chunks)

lightrag/operate.py

@@ -1338,7 +1338,9 @@ async def _get_node_data(
 
     text_units_section_list = [["id", "content", "file_path"]]
     for i, t in enumerate(use_text_units):
-        text_units_section_list.append([i, t["content"], t["file_path"]])
+        text_units_section_list.append(
+            [i, t["content"], t.get("file_path", "unknown_source")]
+        )
     text_units_context = list_of_list_to_csv(text_units_section_list)
     return entities_context, relations_context, text_units_context
 
@@ -1601,7 +1603,9 @@ async def _get_edge_data(
 
     text_units_section_list = [["id", "content", "file_path"]]
     for i, t in enumerate(use_text_units):
-        text_units_section_list.append([i, t["content"], t["file_path"]])
+        text_units_section_list.append(
+            [i, t["content"], t.get("file_path", "unknown_source")]
+        )
     text_units_context = list_of_list_to_csv(text_units_section_list)
     return entities_context, relations_context, text_units_context