No value was obtained for history.messages in RedisChatMessageHistory

[1098842836]

Checked other resources

• I added a very descriptive title to this issue.
• I searched the LangChain documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

`from langchain_redis import RedisChatMessageHistory
from langchain_core.messages import AIMessage, HumanMessage

history = RedisChatMessageHistory(session_id="test002",
redis_url="redis://localhost:6379",
key_prefix="chat_test:",
)

Add messages to the history

history.add_user_message("Hello, AI assistant!")
history.add_ai_message("Hello! How can I assist you today?")

Retrieve messages

print("Chat History:")
for message in history.messages:
print(f"{type(message).name}: {message.content}")

(myenv) PS D:\java-project\RuoYi\Russ-AI-Python> d:; cd 'd:\java-project\RuoYi\Russ-AI-Python'; & 'd:\software\system-software\Anaconda\envs\myenv\python.exe' 'c:\Users\yl.cursor\extensions\ms-python.debugpy-2024.6.0-win32-x64\bundled\libs\debugpy\adapter/../..\debugpy\launcher' '60479' '--' 'd:\java-project\RuoYi\Russ-AI-Python\src\test555.py'
Chat History:

As long as key_prefix is added for the first initialization, history.messages will not get any value`

Error Message and Stack Trace (if applicable)

No response

Description

As long as key_prefix is added for the first initialization, history.messages will not get any value

System Info

(myenv) PS D:\java-project\RuoYi\Russ-AI-Python> d:; cd 'd:\java-project\RuoYi\Russ-AI-Python'; & 'd:\software\system-software\Anaconda\envs\myenv\python.exe' 'c:\Users\yl.cursor\extensions\ms-python.debugpy-2024.6.0-win32-x64\bundled\libs\debugpy\adapter/../..\debugpy\launcher' '60479' '--' 'd:\java-project\RuoYi\Russ-AI-Python\src\test555.py'
Chat History:

[1098842836]

session_id="RAG_admin_ceshi-999" also does not work, you must remove the superfluous symbol RAGadminceshi999

[eyurtsev]

Would appreciate a bug fix if you're able to do it!

---

We also recommend that users transition to langgraph for memory use cases. We have a much more limited offering there of integrations, but the implementations generalize to things beyond just a message history.

https://langchain-ai.github.io/langgraph/tutorials/introduction/

It's also much simpler to set up

[keenborder786]

@1098842836 what is the version of langchain_redis you are using. Since it works fine for me on the latest version.

[1098842836]

@1098842836 what is the version of langchain_redis you are using. Since it works fine for me on the latest version.

Name: langchain-redis
Version: 0.2.0
Summary: An integration package connecting Redis and LangChain
Home-page: https://github.com/langchain-ai/langchain-redis
Author: Brian Sam-Bodden
Author-email: [email protected]
License: MIT
Location: D:\software\system-software\Anaconda\envs\myenv\Lib\site-packages
Requires: jinja2, langchain-core, numpy, python-ulid, redisvl
Required-by:

[1098842836]

@1098842836 what is the version of langchain_redis you are using. Since it works fine for me on the latest version.

@1098842836 what is the version of langchain_redis you are using. Since it works fine for me on the latest version.

Would appreciate a bug fix if you're able to do it!

We also recommend that users transition to langgraph for memory use cases. We have a much more limited offering there of integrations, but the implementations generalize to things beyond just a message history.

https://langchain-ai.github.io/langgraph/tutorials/introduction/

It's also much simpler to set up

I'd be more than happy to fix this bug if the author would let me