From 363c6e2e4cb3fa4ecf2dc5a3ca606eab04d81311 Mon Sep 17 00:00:00 2001 From: stneng Date: Sun, 1 Dec 2024 16:07:15 -0800 Subject: [PATCH] fix --- libs/langgraph/langgraph/graph/state.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libs/langgraph/langgraph/graph/state.py b/libs/langgraph/langgraph/graph/state.py index 0684fb29c..508f4e474 100644 --- a/libs/langgraph/langgraph/graph/state.py +++ b/libs/langgraph/langgraph/graph/state.py @@ -933,12 +933,12 @@ def _is_field_binop(typ: Type[Any]) -> Optional[BinaryOperatorAggregate]: if hasattr(typ, "__metadata__"): meta = typ.__metadata__ if len(meta) >= 1 and callable(meta[-1]): - sig = signature(meta[0]) + sig = signature(meta[-1]) params = list(sig.parameters.values()) if len(params) == 2 and all( p.kind in (p.POSITIONAL_ONLY, p.POSITIONAL_OR_KEYWORD) for p in params ): - return BinaryOperatorAggregate(typ, meta[0]) + return BinaryOperatorAggregate(typ, meta[-1]) else: raise ValueError( f"Invalid reducer signature. Expected (a, b) -> c. Got {sig}"