From d4c49b16e4aead34c16f9919be0000cdc775ca3a Mon Sep 17 00:00:00 2001 From: Philippe PRADOS Date: Tue, 22 Aug 2023 16:36:36 +0200 Subject: [PATCH] Fix ChatMessageHistory (#9594) The initialization of the array of ChatMessageHistory is buggy. The list is shared with all instances. --- .../langchain/memory/chat_message_histories/in_memory.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libs/langchain/langchain/memory/chat_message_histories/in_memory.py b/libs/langchain/langchain/memory/chat_message_histories/in_memory.py index d8db3f424b5..53fbbb201ea 100644 --- a/libs/langchain/langchain/memory/chat_message_histories/in_memory.py +++ b/libs/langchain/langchain/memory/chat_message_histories/in_memory.py @@ -1,6 +1,6 @@ from typing import List -from langchain.pydantic_v1 import BaseModel +from langchain.pydantic_v1 import BaseModel, Field from langchain.schema import ( BaseChatMessageHistory, ) @@ -13,7 +13,7 @@ class ChatMessageHistory(BaseChatMessageHistory, BaseModel): Stores messages in an in memory list. """ - messages: List[BaseMessage] = [] + messages: List[BaseMessage] = Field(default_factory=list) def add_message(self, message: BaseMessage) -> None: """Add a self-created message to the store"""