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Specific error when updating state as an unknown node #1015

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merged 1 commit into from
Jul 14, 2024
Merged

Specific error when updating state as an unknown node #1015

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4 changes: 4 additions & 0 deletions libs/langgraph/langgraph/pregel/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -555,6 +555,8 @@ def update_state(
as_node = last_seen_by_node[-1][1]
if as_node is None:
raise InvalidUpdateError("Ambiguous update, specify as_node")
if as_node not in self.nodes:
raise InvalidUpdateError(f"Node {as_node} does not exist")
# update channels
with ChannelsManager(self.channels, checkpoint, config) as channels:
# create task to run all writers of the chosen node
Expand Down Expand Up @@ -644,6 +646,8 @@ async def aupdate_state(
as_node = last_seen_by_node[-1][1]
if as_node is None:
raise InvalidUpdateError("Ambiguous update, specify as_node")
if as_node not in self.nodes:
raise InvalidUpdateError(f"Node {as_node} does not exist")
# update channels, acting as the chosen node
async with AsyncChannelsManager(self.channels, checkpoint, config) as channels:
# create task to run all writers of the chosen node
Expand Down
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