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fix(pydantic): allow union of BaseModel types as stream_type #754

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fix(pydantic): allow union of BaseModel types as stream_type #754

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fix(pydantic): allow union of BaseModel types as stream_type
Ghraven May 3, 2026
3f7209d
fix(pydantic): allow union of BaseModel types as stream_type
Ghraven May 3, 2026
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5 changes: 3 additions & 2 deletions burr/core/action.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1511,14 +1511,15 @@ def pydantic(
writes: List[str],
state_input_type: Type["BaseModel"],
state_output_type: Type["BaseModel"],
stream_type: Union[Type["BaseModel"], Type[dict]],
stream_type: Union[Type["BaseModel"], Type[dict], object],
tags: Optional[List[str]] = None,
) -> Callable:
"""Creates a streaming action that uses pydantic models.

:param reads: The fields this consumes from the state.
:param writes: The fields this writes to the state.
:param stream_type: The pydantic model or dictionary type that is used to represent the partial results.
:param stream_type: The pydantic model, dictionary type, or a union of pydantic models
(e.g. ``ModelA | ModelB``) used to represent the partial results.
Use a dict if you want this untyped.
:param state_input_type: The pydantic model type that is used to represent the input state.
:param state_output_type: The pydantic model type that is used to represent the output state.
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4 changes: 2 additions & 2 deletions burr/integrations/pydantic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -269,7 +269,7 @@ async def async_action_function(state: State, **kwargs) -> State:
return decorator


PartialType = Union[Type[pydantic.BaseModel], Type[dict]]
PartialType = Union[Type[pydantic.BaseModel], Type[dict], object]

PydanticStreamingActionFunctionSync = Callable[
..., Generator[Tuple[Union[pydantic.BaseModel, dict], Optional[pydantic.BaseModel]], None, None]
Expand All @@ -290,7 +290,7 @@ async def async_action_function(state: State, **kwargs) -> State:

def _validate_and_extract_signature_types_streaming(
fn: PydanticStreamingActionFunction,
stream_type: Optional[Union[Type[pydantic.BaseModel], Type[dict]]],
stream_type: Optional[Union[Type[pydantic.BaseModel], Type[dict], object]],
state_input_type: Optional[Type[pydantic.BaseModel]] = None,
state_output_type: Optional[Type[pydantic.BaseModel]] = None,
) -> Tuple[
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