def METHOD_NAME(self, data, field_name):
    reversed_choices = self.fields[field_name].reversed_choices
    value = data[field_name]
    if value not in reversed_choices:
        log.warning(
            'Unknown abuse report %s value submitted: %s',
            field_name,
            str(data[field_name])[:255],
        )
        value = 'other'
    return value