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import sys
from dataclasses import dataclass, replace
from typing import Optional
import pytest
from apischema import ValidationError, deserialize, serialize
from apischema.metadata import none_as_undefined
from apischema.objects import object_fields, set_object_fields
@dataclass
class Foo:
bar: Optional[str] = None
@pytest.mark.skipif(
(sys.version_info < (3, 8) or ((3, 9) < sys.version_info < (3, 9, 5))),
reason="dataclasses.replace bug with InitVar",
)
def test_object_fields_overriding():
set_object_fields(Foo, [])
assert serialize(Foo, Foo()) == {}
set_object_fields(
Foo,
[
replace(f, metadata=none_as_undefined | f.metadata)
for f in object_fields(Foo, default=None).values()
],
)
assert serialize(Foo, Foo()) == {}
with pytest.raises(ValidationError):
deserialize(Foo, {"bar": None})
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