Fix neo4j outdated get_edge() return data format.

lightrag/kg/neo4j_impl.py

@@ -278,14 +278,16 @@ class Neo4JStorage(BaseGraphStorage):
 
                 result = await session.run(query)
                 record = await result.single()
-                if record and "edge_properties" in record:
+                if record:
                     try:
                         result = dict(record["edge_properties"])
+                        logger.info(f"Result: {result}")
                         # Ensure required keys exist with defaults
                         required_keys = {
                             "weight": 0.0,
                             "source_id": None,
-                            "target_id": None,
+                            "description": None,
+                            "keywords": None,
                         }
                         for key, default_value in required_keys.items():
                             if key not in result:
@@ -305,20 +307,20 @@ class Neo4JStorage(BaseGraphStorage):
                             f"and {entity_name_label_target}: {str(e)}"
                         )
                         # Return default edge properties on error
-                        return {"weight": 0.0, "source_id": None, "target_id": None}
+                        return {"weight": 0.0, "description": None, "keywords": None, "source_id": None}
 
                 logger.debug(
                     f"{inspect.currentframe().f_code.co_name}: No edge found between {entity_name_label_source} and {entity_name_label_target}"
                 )
                 # Return default edge properties when no edge found
-                return {"weight": 0.0, "source_id": None, "target_id": None}
+                return {"weight": 0.0, "description": None, "keywords": None, "source_id": None}
 
         except Exception as e:
             logger.error(
                 f"Error in get_edge between {source_node_id} and {target_node_id}: {str(e)}"
             )
             # Return default edge properties on error
-            return {"weight": 0.0, "source_id": None, "target_id": None}
+            return {"weight": 0.0, "description": None, "keywords": None, "source_id": None}
 
     async def get_node_edges(self, source_node_id: str) -> list[tuple[str, str]] | None:
         node_label = source_node_id.strip('"')