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Make expand() error vague so it's not misleading #24018

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Jun 2, 2022
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Make expand() error vague so it's not misleading #24018

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2 changes: 1 addition & 1 deletion airflow/models/mappedoperator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -201,7 +201,7 @@ def _expand(self, **mapped_kwargs: "Mappable") -> "MappedOperator":
from airflow.operators.empty import EmptyOperator

validate_mapping_kwargs(self.operator_class, "expand", mapped_kwargs)
prevent_duplicates(self.kwargs, mapped_kwargs, fail_reason="mapping already partial")
prevent_duplicates(self.kwargs, mapped_kwargs, fail_reason="unmappable or already specified")
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Suggested change
prevent_duplicates(self.kwargs, mapped_kwargs, fail_reason="unmappable or already specified")
prevent_duplicates(self.kwargs, mapped_kwargs, fail_reason="unmappable or already specified (see https://airflow.apache.org/docs/apache-airflow/stable/concepts/dynamic-task-mapping.html#mapping-with-non-taskflow-operators )")

Don't we want to direct the user to the exact place in the docs where more context and details is explained? I think that would be an empathetic bahaviour towards the users who see it for the very first time.

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We can even create a short link for it:

Suggested change
prevent_duplicates(self.kwargs, mapped_kwargs, fail_reason="unmappable or already specified")
prevent_duplicates(self.kwargs, mapped_kwargs, fail_reason="unmappable or already specified (see https://s.apache.org/airflow-unmappable) ")

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Personally I don’t like putting documentation links in the error message. We could make this more prominent in the documentation page though, perhaps adding a section with the error message in the title.

ensure_xcomarg_return_value(mapped_kwargs)

partial_kwargs = self.kwargs.copy()
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