Converter copy does not copy unstructure hooks #398
Description
- cattrs version: 23.1.2
- Python version: 3.9.17
- Operating System: Gentoo
Description
I wanted to create a base Converter with some common unstructuring hooks, then copy it in other places and add extra hooks. After copying the Converter I found that the unstructuring hooks from the source Converter no longer work.
What I Did
from dataclasses import dataclass
from functools import partial
from typing import Any
import cattrs
@dataclass
class C:
value: int
@dataclass
class D:
child: Any
# https://github.com/python-attrs/cattrs/issues/320
def _unstructure_any(converter, value):
return converter.unstructure(value, unstructure_as=value.__class__)
converter = cattrs.Converter()
converter.register_unstructure_hook_func(
lambda t: t is Any, partial(_unstructure_any, converter)
)
d = D(child=C(value=42))
actual = converter.unstructure(d)
expected = {"child": {"value": 42}}
assert expected == actual
converter = converter.copy()
d = D(child=C(value=42))
actual = converter.unstructure(d)
expected = {"child": {"value": 42}}
assert expected == actual, "failure"Traceback (most recent call last):
File "tmp.py", line 36, in <module>
assert expected == actual, "failure"
AssertionError: failure