fix: generate answer node

Author: VinciGit00

scrapegraphai/nodes/generate_answer_node.py

@@ -3,6 +3,7 @@
 """
 from typing import List, Optional
 from json.decoder import JSONDecodeError
+import time
 from langchain.prompts import PromptTemplate
 from langchain_core.output_parsers import JsonOutputParser
 from langchain_core.runnables import RunnableParallel
@@ -12,14 +13,13 @@
 from tqdm import tqdm
 from .base_node import BaseNode
 from ..utils.output_parser import get_structured_output_parser, get_pydantic_output_parser
+from requests.exceptions import Timeout
+from langchain.callbacks.manager import CallbackManager
+from langchain.callbacks import get_openai_callback
 from ..prompts import (
     TEMPLATE_CHUNKS, TEMPLATE_NO_CHUNKS, TEMPLATE_MERGE,
     TEMPLATE_CHUNKS_MD, TEMPLATE_NO_CHUNKS_MD, TEMPLATE_MERGE_MD
 )
-from langchain.callbacks.manager import CallbackManager
-from langchain.callbacks import get_openai_callback
-from requests.exceptions import Timeout
-import time
 
 class GenerateAnswerNode(BaseNode):
     """
@@ -82,11 +82,8 @@ def execute(self, state: dict) -> dict:
 
         if self.node_config.get("schema", None) is not None:
             if isinstance(self.llm_model, ChatOpenAI):
-                self.llm_model = self.llm_model.with_structured_output(
-                    schema=self.node_config["schema"]
-                )
-                output_parser = get_structured_output_parser(self.node_config["schema"])
-                format_instructions = "NA"
+                output_parser = get_pydantic_output_parser(self.node_config["schema"])
+                format_instructions = output_parser.get_format_instructions()
             else:
                 if not isinstance(self.llm_model, ChatBedrock):
                     output_parser = get_pydantic_output_parser(self.node_config["schema"])