init=False and inheritance

[robertodr]

I think this is related to #333. Before #334, init=False fields would end up being passed to the __init__ method during deserialization. After #334, that's no longer the case, however, when this is mixed with inheritance I see the init=False fields pop up in the subclasses.

Here is an example:

from __future__ import annotations

from abc import ABC, abstractmethod
from dataclasses import dataclass, field

from serde import serde
from serde.json import from_json, to_json


@serde
@dataclass
class FooBase(ABC):
    i: int
    j: float = field(
        init=False,
        repr=False,
        compare=False,
    )

    def __post_init__(self) -> None:
        self.j = self.i * 10

    @abstractmethod
    def compute(self, k: float) -> list[float]:
        pass


@serde
@dataclass
class ConcreteA(FooBase):
    bar: list[float]
    foo: dict[str, float] = field(
        init=False,
        default_factory=lambda: {"a": 0.25, "b": 0.43},
    )

    def __post_init__(self) -> None:
        super().__post_init__()

    def compute(self, k: float) -> list[float]:
        return [x * k for x in self.bar]


foo = ConcreteA(
    i=10,
    bar=[
        1.0,
        2.0,
        0.5,
    ],
)
print(f"{to_json(foo)=}")

bar = from_json(ConcreteA, to_json(foo))
print(bar)

here the initialization of bar fails with the familiar:

Traceback (most recent call last):
  File "/workspaces/aurora/.venv/lib/python3.10/site-packages/serde/de.py", line 400, in from_obj
    return deserializable_to_obj(c)
  File "/workspaces/aurora/.venv/lib/python3.10/site-packages/serde/de.py", line 380, in deserializable_to_obj
    res = serde_scope.funcs[func_name](cls, maybe_generic=maybe_generic, data=o, reuse_instances=reuse_instances)
  File "<string>", line 29, in from_dict
serde.compat.UserError: ConcreteA.__init__() takes 3 positional arguments but 4 were given

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/workspaces/aurora/check.py", line 54, in <module>
    bar = from_json(ConcreteA, to_json(foo))
  File "/workspaces/aurora/.venv/lib/python3.10/site-packages/serde/json.py", line 77, in from_json
    return from_dict(c, de.deserialize(s, **opts), reuse_instances=False)
  File "/workspaces/aurora/.venv/lib/python3.10/site-packages/serde/de.py", line 486, in from_dict
    return from_obj(cls, o, named=True, reuse_instances=reuse_instances)
  File "/workspaces/aurora/.venv/lib/python3.10/site-packages/serde/de.py", line 460, in from_obj
    raise e.inner
  File "<string>", line 19, in from_dict
TypeError: ConcreteA.__init__() takes 3 positional arguments but 4 were given