Update operate.py

lightrag/operate.py

@@ -451,6 +451,58 @@ async def _rebuild_single_entity(
     if not current_entity:
         return
 
+    # Helper function to update entity in both graph and vector storage
+    async def _update_entity_storage(
+        final_description: str, 
+        entity_type: str, 
+        file_paths: set[str]
+    ):
+        # Update entity in graph storage
+        updated_entity_data = {
+            **current_entity,
+            "description": final_description,
+            "entity_type": entity_type,
+            "source_id": GRAPH_FIELD_SEP.join(chunk_ids),
+            "file_path": GRAPH_FIELD_SEP.join(file_paths) if file_paths else current_entity.get("file_path", "unknown_source"),
+        }
+        await knowledge_graph_inst.upsert_node(entity_name, updated_entity_data)
+
+        # Update entity in vector database
+        entity_vdb_id = compute_mdhash_id(entity_name, prefix="ent-")
+
+        # Delete old vector record first
+        try:
+            await entities_vdb.delete([entity_vdb_id])
+        except Exception as e:
+            logger.debug(f"Could not delete old entity vector record {entity_vdb_id}: {e}")
+
+        # Insert new vector record
+        entity_content = f"{entity_name}\n{final_description}"
+        await entities_vdb.upsert(
+            {
+                entity_vdb_id: {
+                    "content": entity_content,
+                    "entity_name": entity_name,
+                    "source_id": updated_entity_data["source_id"],
+                    "description": final_description,
+                    "entity_type": entity_type,
+                    "file_path": updated_entity_data["file_path"],
+                }
+            }
+        )
+
+    # Helper function to generate final description with optional LLM summary
+    async def _generate_final_description(combined_description: str) -> str:
+        if len(combined_description) > global_config["summary_to_max_tokens"]:
+            return await _handle_entity_relation_summary(
+                entity_name,
+                combined_description,
+                global_config,
+                llm_response_cache=llm_response_cache,
+            )
+        else:
+            return combined_description
+
     # Collect all entity data from relevant chunks
     all_entity_data = []
     for chunk_id in chunk_ids:
@@ -458,10 +510,41 @@ async def _rebuild_single_entity(
             all_entity_data.extend(chunk_entities[chunk_id][entity_name])
 
     if not all_entity_data:
-        logger.warning(f"No cached entity data found for {entity_name}")
+        logger.warning(f"No cached entity data found for {entity_name}, trying to rebuild from relationships")
+        
+        # Get all edges connected to this entity
+        edges = await knowledge_graph_inst.get_node_edges(entity_name)
+        if not edges:
+            logger.warning(f"No relationships found for entity {entity_name}")
+            return
+        
+        # Collect relationship data to extract entity information
+        relationship_descriptions = []
+        file_paths = set()
+        
+        # Get edge data for all connected relationships
+        for src_id, tgt_id in edges:
+            edge_data = await knowledge_graph_inst.get_edge(src_id, tgt_id)
+            if edge_data:
+                if edge_data.get("description"):
+                    relationship_descriptions.append(edge_data["description"])
+                
+                if edge_data.get("file_path"):
+                    edge_file_paths = edge_data["file_path"].split(GRAPH_FIELD_SEP)
+                    file_paths.update(edge_file_paths)
+        
+        # Generate description from relationships or fallback to current
+        if relationship_descriptions:
+            combined_description = GRAPH_FIELD_SEP.join(relationship_descriptions)
+            final_description = await _generate_final_description(combined_description)
+        else:
+            final_description = current_entity.get("description", "")
+        
+        entity_type = current_entity.get("entity_type", "UNKNOWN")
+        await _update_entity_storage(final_description, entity_type, file_paths)
         return
 
-    # Merge descriptions and get the most common entity type
+    # Process cached entity data
     descriptions = []
     entity_types = []
     file_paths = set()
@@ -488,52 +571,9 @@ async def _rebuild_single_entity(
         else current_entity.get("entity_type", "UNKNOWN")
     )
 
-    # Use summary if description is too long
-    if len(combined_description) > global_config["summary_to_max_tokens"]:
-        final_description = await _handle_entity_relation_summary(
-            entity_name,
-            combined_description,
-            global_config,
-            llm_response_cache=llm_response_cache,
-        )
-    else:
-        final_description = combined_description
-
-    # Update entity in graph storage
-    updated_entity_data = {
-        **current_entity,
-        "description": final_description,
-        "entity_type": entity_type,
-        "source_id": GRAPH_FIELD_SEP.join(chunk_ids),
-        "file_path": GRAPH_FIELD_SEP.join(file_paths)
-        if file_paths
-        else current_entity.get("file_path", "unknown_source"),
-    }
-    await knowledge_graph_inst.upsert_node(entity_name, updated_entity_data)
-
-    # Update entity in vector database
-    entity_vdb_id = compute_mdhash_id(entity_name, prefix="ent-")
-
-    # Delete old vector record first
-    try:
-        await entities_vdb.delete([entity_vdb_id])
-    except Exception as e:
-        logger.debug(f"Could not delete old entity vector record {entity_vdb_id}: {e}")
-
-    # Insert new vector record
-    entity_content = f"{entity_name}\n{final_description}"
-    await entities_vdb.upsert(
-        {
-            entity_vdb_id: {
-                "content": entity_content,
-                "entity_name": entity_name,
-                "source_id": updated_entity_data["source_id"],
-                "description": final_description,
-                "entity_type": entity_type,
-                "file_path": updated_entity_data["file_path"],
-            }
-        }
-    )
+    # Generate final description and update storage
+    final_description = await _generate_final_description(combined_description)
+    await _update_entity_storage(final_description, entity_type, file_paths)
 
 
 async def _rebuild_single_relationship(
@@ -798,7 +838,8 @@ async def _merge_edges_then_upsert(
                 )
 
     # Process edges_data with None checks
-    weight = sum([dp["weight"] for dp in edges_data] + already_weights)
+    all_weights = [dp["weight"] for dp in edges_data] + already_weights
+    weight = sum(all_weights) / len(all_weights)
     description = GRAPH_FIELD_SEP.join(
         sorted(
             set(