class ConversionMixin:
converters = []
def clean(self, raw_value):
for converter in self.converters:
raw_value = converter(raw_value)
return super().clean(raw_value)
def with_converters(field, *converters, **field_kwargs):
class_name = 'Conversion{}'.format(field.__name__)
new_class = type(class_name, (ConversionMixin, field), {'converters': converters})
return partial(new_class, **field_kwargs)
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