langchain: add aprep_output method to langchain/chains/base.py
#20748
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….py` (#20748) ## Description Add `aprep_output` method to `langchain/chains/base.py`. Some downstream `ChatMessageHistory` objects that use async connections require an async way to append to the context. It turned out that `ainvoke()` was calling `prep_output` which is synchronous. --------- Co-authored-by: Bagatur <[email protected]>
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Description
Add
aprep_outputmethod tolangchain/chains/base.py. Some downstreamChatMessageHistoryobjects that use async connections require an async way to append to the context.It turned out that
ainvoke()was callingprep_outputwhich is synchronous.