Function create_partial

tests/test_config.py:889–897

(model, optionals)

        b: int

    def create_partial(model, optionals):
        override_fields = {}
        model.model_rebuild()
        for name, field in model.model_fields.items():
            if field.is_required() and name in optionals:
                assert field.annotation is not None
                override_fields[name] = (Optional[field.annotation], FieldInfo.merge_field_infos(field, default=None))

        return create_model(f'Partial{model.__name__}', __base__=model, **override_fields)

    partial = create_partial(M, {'a'})