From f499e6ea6a90c00074ef244ce0e5f172d0e7a8a6 Mon Sep 17 00:00:00 2001
From: Nikita Pokidyshev <nik96lip@gmail.com>
Date: Fri, 28 Jul 2023 03:45:27 +0400
Subject: [PATCH] Add FunctionMessage to _message_from_dict (#8374)

<!-- Thank you for contributing to LangChain!

Replace this comment with:
  - Description: a description of the change,
  - Issue: the issue # it fixes (if applicable),
  - Dependencies: any dependencies required for this change,
- Tag maintainer: for a quicker response, tag the relevant maintainer
(see below),
- Twitter handle: we announce bigger features on Twitter. If your PR
gets announced and you'd like a mention, we'll gladly shout you out!

Please make sure you're PR is passing linting and testing before
submitting. Run `make format`, `make lint` and `make test` to check this
locally.

If you're adding a new integration, please include:
1. a test for the integration, preferably unit tests that do not rely on
network access,
  2. an example notebook showing its use.

Maintainer responsibilities:
  - General / Misc / if you don't know who to tag: @baskaryan
  - DataLoaders / VectorStores / Retrievers: @rlancemartin, @eyurtsev
  - Models / Prompts: @hwchase17, @baskaryan
  - Memory: @hwchase17
  - Agents / Tools / Toolkits: @hinthornw
  - Tracing / Callbacks: @agola11
  - Async: @agola11

If no one reviews your PR within a few days, feel free to @-mention the
same people again.

See contribution guidelines for more information on how to write/run
tests, lint, etc:
https://github.com/hwchase17/langchain/blob/master/.github/CONTRIBUTING.md
 -->
---
 libs/langchain/langchain/schema/messages.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libs/langchain/langchain/schema/messages.py b/libs/langchain/langchain/schema/messages.py
index 8895ed7e25..c926bcc8f6 100644
--- a/libs/langchain/langchain/schema/messages.py
+++ b/libs/langchain/langchain/schema/messages.py
@@ -230,6 +230,8 @@ def _message_from_dict(message: dict) -> BaseMessage:
         return SystemMessage(**message["data"])
     elif _type == "chat":
         return ChatMessage(**message["data"])
+    elif _type == "function":
+        return FunctionMessage(**message["data"])
     else:
         raise ValueError(f"Got unexpected message type: {_type}")