def _build_value_for_union(union: Type, data: Any, config: Config) -> Any:
types = extract_generic(union)
if is_optional(union) and len(types) == 2:
return _build_value(type_=types[0], data=data, config=config)
union_matches = {}
for inner_type in types:
try:
# noinspection PyBroadException
try:
data = transform_value(type_hooks=config.type_hooks,
cast=config.cast,
target_type=inner_type,
value=data)
except Exception: # pylint: disable=broad-except
continue
value = _build_value(type_=inner_type, data=data, config=config)
if is_instance(value, inner_type):
if config.strict_unions_match:
union_matches[inner_type] = value
else:
return value
except DaciteError:
pass
if config.strict_unions_match:
if len(union_matches) > 1:
raise StrictUnionMatchError(union_matches)
return union_matches.popitem()[1]
if not config.check_types:
return data
raise UnionMatchError(field_type=union, value=data)
def get_default_value_for_field(field: Field) -> Any:
if field.default != MISSING:
return field.default
elif field.default_factory != MISSING: # type: ignore
return field.default_factory() # type: ignore
elif is_optional(field.type):
return None
raise DefaultValueNotFoundError()
def _build_value_for_union(union: Type, data: Any, config: Config) -> Any:
types = extract_generic(union)
if is_optional(union) and len(types) == 2:
return _build_value(type_=types[0], data=data, config=config)
for inner_type in types:
try:
value = _build_value(type_=inner_type, data=data, config=config)
if is_instance(value, inner_type):
return value
except DaciteError:
pass
if not config.check_types:
return data
raise UnionMatchError(field_type=union, value=data)
def test_is_optional_with_optional_of_union():
assert is_optional(Optional[Union[int, float]])
def test_is_optional_with_non_optional():
assert not is_optional(int)
def test_is_optional_with_optional():
assert is_optional(Optional[int])
def has_field_default_value(field: Field) -> bool:
return field.default != MISSING or field.default_factory != MISSING or is_optional(field.type) # type: ignore
