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Improve uncaught PydanticUseDefault exception message #1730

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Merged
merged 1 commit into from
Jun 5, 2025
Merged

Improve uncaught PydanticUseDefault exception message #1730

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2 changes: 1 addition & 1 deletion src/errors/validation_exception.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,7 @@ impl ValidationError {
}

pub fn use_default_error() -> PyErr {
py_schema_error_type!("Uncaught UseDefault error, please check your usage of `default` validators.")
py_schema_error_type!("Uncaught `PydanticUseDefault` exception: the error was raised in a field validator and no default value is available for that field.")
}

fn maybe_add_cause(self_: PyRef<'_, Self>, py: Python) -> Option<PyErr> {
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10 changes: 8 additions & 2 deletions tests/validators/test_with_default.py
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Original file line number Diff line number Diff line change
Expand Up @@ -627,12 +627,18 @@ def val_func(v: Any, handler: core_schema.ValidatorFunctionWrapHandler) -> Any:
validator = SchemaValidator(
core_schema.with_default_schema(core_schema.no_info_wrap_validator_function(val_func, core_schema.int_schema()))
)
with pytest.raises(SchemaError, match='Uncaught UseDefault error, please check your usage of `default` validators'):
with pytest.raises(
SchemaError,
match='Uncaught `PydanticUseDefault` exception: the error was raised in a field validator and no default value is available for that field.',
):
validator.validate_python('')

# same if there is no WithDefault validator
validator = SchemaValidator(core_schema.no_info_wrap_validator_function(val_func, core_schema.int_schema()))
with pytest.raises(SchemaError, match='Uncaught UseDefault error, please check your usage of `default` validators'):
with pytest.raises(
SchemaError,
match='Uncaught `PydanticUseDefault` exception: the error was raised in a field validator and no default value is available for that field.',
):
validator.validate_python('')


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