def test_invalid_module_name(self):
# Arrange/Assert/act
with self.assertRaises(InvalidFunctionError) as context:
FunctionBuilder.parse_function_str("tests.custom_functions_for_tests_nope.sum(5)")
# Assert
self.assertTrue("Invalid module for a custom function" in str(context.exception))
def get_transform_functions_from_field(
transform_field: Union[str, List[str]]) -> List[Callable]:
"""Generate a list of transform functions from a list of string
values (or a single string value).
:param transform_field: A list of string values (or a single string value)
that reference one or several transform functions.
:type transform_field: Union[str, List[str]]
:return: List of transform functions.
:rtype: List[Callable]
"""
# First, get a string list
function_str_list = None
if transform_field is None:
function_str_list = []
elif isinstance(transform_field, str):
function_str_list = [transform_field]
else:
function_str_list = transform_field
return [
FunctionBuilder.parse_function_str(function_str)
for function_str in function_str_list
]
def test_parsed_function_str(self):
builtin_function_test = "copyFrom(field_to_copy)"
custom_function_test = "tests.custom_functions_for_tests.sum(2)"
input_record = {
("field_1",): "hola",
("field_to_copy",): 42,
("field_3",): 7
}
expected_builtin_res = 42
expected_custom_res = 9
# Act
parsed_builtin_function = FunctionBuilder.parse_function_str(builtin_function_test)
parsed_custom_function = FunctionBuilder.parse_function_str(custom_function_test)
# Assert
self.assertEqual(parsed_builtin_function(7, input_record, None, {}), expected_builtin_res)
self.assertEqual(parsed_custom_function(7, input_record, None, {}), expected_custom_res)
def get_selector_function(selector_field: str) -> Callable:
"""Generates a Selector function from a string.
:param selector_field: A string that represents a Selector function.
:type selector_field: str
:return: A Selector function.
:rtype: Callable
"""
if selector_field is None:
return None
else:
return FunctionBuilder.parse_function_str(selector_field)