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schema descriptor should raise AttributeError if build_schema_ is not implemented #2197

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Merged
cosmicBboy merged 1 commit into from
Jan 6, 2026
+11 −1
Merged

schema descriptor should raise AttributeError if build_schema_ is not implemented #2197

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12 changes: 11 additions & 1 deletion pandera/api/dataframe/model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -158,7 +158,17 @@ def __get__(self, obj, cls):
else:
kwargs = {}

MODEL_CACHE[(cls, thread_id)] = cls.build_schema_(**kwargs)
try:
MODEL_CACHE[(cls, thread_id)] = cls.build_schema_(**kwargs)
except NotImplementedError as e:
# Raise AttributeError to signal that this attribute is not available
# for abstract/incomplete model classes. This allows introspection tools
# like pydoc to continue without crashing.
raise AttributeError(
f"'{cls.__name__}' does not implement build_schema_() and cannot "
f"generate a schema. To be able to generate a schema, subclass the"
"DataFrameModel for a specific backend."
) from e

return MODEL_CACHE[(cls, thread_id)] # type: ignore

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