class ConversionMixin:
    converters = []

    def clean(self, raw_value):
        for converter in self.converters:
            raw_value = converter(raw_value)

        return super().clean(raw_value)

def create_conversion_field(field, *new_converters):
    class NewConversionField(ConversionMixin, field):
        converters = new_converters

        def __reduce__(self):
            return (create_conversion_field, (field, new_converters))

    NewConversionField.__name__ = 'Conversion{}'.format(field.__name__)

    return NewConversionField


def with_converters(field, *converters, **field_kwargs):
    return partial(create_conversion_field(field, *converters), **field_kwargs)