Rename fields in DRF serializer

mixins.py

class RenameFieldsSerializerMixin(object):
    def rename_field_from(self, name):
        return name.upper()

    def rename_field_to(self, name):
        return name.lower()

    def to_internal_value(self, data):
        instance = super().to_internal_value(data)
        new_data = OrderedDict()
        for name, value in data.items():
            new_data[self.rename_field_to(name)] = value

        return super().to_internal_value(new_data)

    def to_representation(self, instance):
        data = super().to_representation(instance)
        new_data = OrderedDict()
        for name, value in data.items():
            new_data[self.rename_field_from(name)] = value
        return new_data