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Matt WellsandHarrison Chase
e1ea191237
**Description** The docs for creating a RAG chain with Memory [currently use a manual lambda](https://python.langchain.com/docs/expression_language/cookbook/retrieval#with-memory-and-returning-source-documents) to format chat history messages. [There exists a helper method within the codebase](https://github.com/langchain-ai/langchain/blob/master/libs/langchain/langchain/schema/messages.py#L14C15-L14C15) to perform this task so I've updated the documentation to demonstrate its usage Also worth noting that the current documented method of using the included `_format_chat_history ` function actually results in an error: ``` TypeError: 'HumanMessage' object is not subscriptable ``` --------- Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
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