Python prevent overriding serialization

DataclassJSON.py

class DataclassJSONEncoder(JSONEncoder):
    """ JSON encoder for JSON mysql fields to handle encoding dataclasses and enum classes """
    def default(self, o):
        if is_dataclass(o):
            return dataclasses.asdict(o)
        elif isinstance(o, Enum):
            return o.value
        return super().default(o)
class DataclassJSONField(JSONField):
    """
  Override to handle database level serialization/deserialization of dataclasses
    - should be serialized from dataclass -> JSON
    - should be deserialized from JSON -> dataclass
  """
    def __init__(self, *args, **kwargs):
        self.dataclass_cls = kwargs.pop("dataclass_cls", None)
        kwargs["encoder"] = kwargs.pop("encoder", DataclassJSONEncoder(allow_nan=False))
        super().__init__(*args, **kwargs)
    def from_db_value(self, *args):
        value = super().from_db_value(*args)
        if value is None:
            return None
        # Note: this error checking would be better implemented in the __init__ method
        #   but we ran into issues with django migrations on existing fields placing it there.
    if self.dataclass_cls is None:
            raise NotImplementedError("No dataclass_cls set for DataclassJSONField")
        return self.dataclass_cls(**value)