Override from_dict()

[mwerlberger]

In order to add some logic to the from_dict to instantiate the correct dataclass I would like to override the from_dict() function. Hence, I added the same as in the API. I could not get it to work and be picked up but don't understand why that is. A minimal example for this is attached below and the overridden function isn't called. I also tried to not inherit from DataClassJsonMixin but use the @dataclass_json decorator. Didn't change anything. What am I doing wrong?

from dataclasses_json import dataclass_json, Undefined, DataClassJsonMixin
from dataclasses_json.core import Json
from dataclasses import dataclass
from typing import Type, TypeVar


A = TypeVar("A", bound="DataClassJsonMixin")

@dataclass
class ParamsA(DataClassJsonMixin):
    value: int
    msg: str = "ParamsA"

    @classmethod
    def from_dict(cls: Type[A], kvs: Json, *, infer_missing=False) -> A:
      print("override from_dict...")
      print(kvs)
      return cls(value=kvs["value"], msg=kvs["msg"])


@dataclass_json(undefined=Undefined.RAISE)
@dataclass
class ParamsB:
    params: ParamsA
    msg: str = "paramsB"


b = ParamsB(params = ParamsA(value = 10))
print(b.to_dict())
print(type(b))
print(type(b.params))

b2 = ParamsB.from_dict(b.to_dict())
print(b2.to_dict())
print(type(b2))
print(type(b2.params))