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fix: Fields of pydantic can be updated by aliases #2585

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fix: Fields of pydantic can be updated by aliases #2585

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9 changes: 9 additions & 0 deletions libs/langgraph/langgraph/graph/state.py
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Original file line number Diff line number Diff line change
Expand Up @@ -641,6 +641,13 @@ def _get_state_key(input: Union[None, dict, Any], *, key: str) -> Any:
if input is None:
return SKIP_WRITE
elif isinstance(input, dict):
if hasattr(self.builder.output, 'model_fields'):
model_fields = self.builder.output.model_fields
# Extract the alias for the key if it exists
if key in model_fields:
alias = model_fields[key].alias
if alias in input:
return input.get(alias, SKIP_WRITE)
if all(k not in output_keys for k in input):
raise InvalidUpdateError(
f"Expected node {node_key} to update at least one of {output_keys}, got {input}"
Expand Down Expand Up @@ -823,6 +830,8 @@ def _get_state_reader(


def _coerce_state(schema: Type[Any], input: dict[str, Any]) -> dict[str, Any]:
if hasattr(schema, '__fields__') and any(field.alias and field.alias != name for name, field in schema.__fields__.items()):
input = {schema.model_fields[key].alias if key in schema.model_fields else key: value for key, value in input.items()}
return schema(**input)


Expand Down