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fix(langgraph): treat clear_cache([]) as no-op instead of clearing all #9337

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fix(langgraph): treat clear_cache([]) as no-op instead of clearing all #9337

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6 changes: 4 additions & 2 deletions libs/langgraph/langgraph/pregel/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4225,7 +4225,8 @@ def clear_cache(self, nodes: Sequence[str] | None = None) -> None:
"""Clear the cache for the given nodes."""
if not self.cache:
raise ValueError("No cache is set for this graph. Cannot clear cache.")
nodes = nodes or self.nodes.keys()
if nodes is None:
nodes = self.nodes.keys()
# collect namespaces to clear
namespaces: list[tuple[str, ...]] = []
for node in nodes:
Expand All @@ -4244,7 +4245,8 @@ async def aclear_cache(self, nodes: Sequence[str] | None = None) -> None:
"""Asynchronously clear the cache for the given nodes."""
if not self.cache:
raise ValueError("No cache is set for this graph. Cannot clear cache.")
nodes = nodes or self.nodes.keys()
if nodes is None:
nodes = self.nodes.keys()
# collect namespaces to clear
namespaces: list[tuple[str, ...]] = []
for node in nodes:
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